An aliphatic-amine-bearing chromatographic support, based on commercial silica, was prepared and tested as potential matrix for affinity immobilization of a copper/topaquinone-containing amine oxidase from lentil seedlings. The support proved to be noticeably effective in immobilizing the enzyme with concomitant purification and activity retention. The immobilization yields and some properties of this preparation were also determined and compared with those of the soluble enzyme. High activity r...
Autori: Barbara Noli, Enrico Sanjust, Francesca Sollai, Giovanni Floris
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25108

Contain all the articles from this issueICEEM /01 PLENARY CONFERENCETen years of Environmental Engineering and Management education and research at the Technical University of IasiMatei Macoveanu, Carmen Teodosiu ICEEM/01  - Environmental Engineering SectionRemoval of nitrogen oxides from Diesel exhaust: Laboratory studies for development of an SCR-catalyst-system using solid urea as reducing agentWerner Weisweiler High temperature desulphurization of hydrogen sulphide containing ...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25167

Contain all the articles from this issueICEEM /02 PLENARY SESSION:"Environmental Engineering and Management in the Context of Sustainable Development"Green technology foresight of high technology: Hype of potentials - The challenges from nanotechnology, Biotechnology and ICTMichael S?¸gaard J?¸rgensenIntrinsic properties of noble metals in catalytic selective reduction of NO by propene in lean burn conditionsAnne Giroir-Fendler, Helleh Saadallah, Adela HaletaICEEM/02 - ENVIRONMENTAL ENGINEERING ...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25178

Include urmatoarele articole:� Cost sensitivity analysis by Monte Carlo simulation� Mathematical modeling of gas drying by adsorption� Methyl isobutyl ketone combustion over Pt/Al2O3 catalyst� Distribution of oxygen transfer rate in stirred bioreactors with simulated broths� Unsteady heat transfer inside an elliptic cylinder� Triphasic external-loop airlift reactors. Hydrodynamic and dispersion studies� Sustainable combined utilization of renewable forest resources and coal in Roma...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25209

AbstractMesoporous Ti-SBA-15 materials have been synthesized up to a Si/Ti ratio of 20 using a two-step pH adjusting method. Low angle X-ray diffraction and diffuse reflectance UV-Vis spectroscopy revealed that the optimal pH value to synthesize highly ordered mesoporous solids having Ti atoms primarily in tetrahedral coordination environments is around 7.5. The nitrogen physisorption and TEM indicated also ordered mesostructures having relatively large surface areas and uniform mesopore size di...
Autori: Adrian Ungureanu, Alexandru Chirieac, Brindusa Dragoi, Cezar Catrinescu, Emil Dumitriu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25263

AbstractZeolites Cs+, Na+-chabazite with SiO2 /Al2O3 ratio of 7 were prepared from gels with molar composition (2.41-2.73)(Cs+ + Na+)2O : (0.02 TPAOH) : Al2O3 : 7.21 SiO2 : (194-204) H2O in static hydrothermal conditions at 108 – 132 0C for 8-21 days. The solids were characterized by X - ray diffraction, scanning electron microscopy, thermal analysis and nitrogen sorption measurements. The nitrogen sorption isotherms at -1960C present a hysteresis loop which is indicative for the existence of ...
Autori: Ionela Droahna, Iuliean Asaftei, Nicolae Bilba
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25266

AbstractTheoretical and experimental studies of gas drying processes by adsorption in fixed bed of grains are presented in this paper. Based on an extensive literature study, some of the most representative mathematical models describing gas adsorption in fixed bed and consequently gas drying processes by adsorption in fixed bed are also presented. Using a mathematical model from those mentioned describing adsorption under isotherm regime, the temperature and gas flow velocity effects over the d...
Autori: Marius Sebastian Secula, Stelian Petrescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25272

AbstractPolycyclic aromatic hydrocarbons (PAHs) are included in the European Community (EC) and in the Environmental Protection Agency (EPA) priority pollutant list due to their mutagenic and carcinogenic properties. PAHs emissions from automobile traffic and industry activities were shown to influence the PAHs levels and profiles in vegetables grown nearby. The levels of 15 PAHs were determinate in samples of pepper (Capsicum Annuum) and tomato (SolanumLlycopersicum) in different stages of plan...
Autori: Alina Soceanu, Dan Tiberius Epure, Gabriela Stanciu, Simona Dobrinas, Valentina Coatu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25360

AbstractHigh proton conductivity of CsHSO4 opened new opportunities for applications as electrolyte in solid acid fuel cells (SAFC). Relatively recent, it was proved that the accommodation of this solid electrolyte by silica supports improves its proton conductivity. During this work, solid acid CsHSO4 and its composites with mesoporous silica of SBA-15 and MCF-types as host materials were synthesized and studied for the first time. Studies were mainly focused on the influence of mesoporous supp...
Autori: Adrian Ungureanu, Brindusa Dragoi, Emil Dumitriu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25366

Include urmatoarele articole:� CsHSO4/mesoporous silica composites - new electrolytes for solid acid fuel cells� Trend in exhaust emissions from in-use gasoline vehicles� Analysis of distribution of oxygen transfer rate in stirred bioreactors for bacterial broths� Electrochemical characteristics of Ti6Al7Nb alloy in Ringer's solution� Pulsed high voltage discharge technology as a new method for killing Hepatitis C virus (HCV) cells� Hydrodynamic modelling of pollution with LNAPL gene...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25367

AbstractEquilibrium data of water vapor adsorption from wet air on several materials were experimentally determined at temperature values of 313 and 333 K and air relative humidity values ranged between 30 and 90 %. Experimental data were correlated with Langmuir and Freundlich models. The obtained results emphasize the significant difference between the water retained on the adsorbent materials impregnated with various salt solutions, and on classic adsorbents....
Autori: Ioan Mămăligă, Constantin Baciu, Stelian Petrescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25394

Abstract Study of geopolymer is a developing field of research for capitalizing solid waste and by-products in the view of new materials achievement having characteristics necessary for using as cement substitute. Also, it provides a solution to many problems regarding environment, such as reduction of gaseous emissions and particles matter resulted from cement industry and raw materials economy. In this paper, the experimental conditions for obtaining new materials on the basis of fly ash f...
Autori: Maria Harja, , Maria Gavrilescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25419

Abstract At present, dangerous industrial wastes are a main source of environmental pollution because they are stored and deposited improperly. Besides, dangerous industrial wastes could also be a source of secondary raw materials which are not well capitalized. This fact causes substantial losses of secondary raw materials and energy and it is explained by the lack of certain technologies of treatment, capitalization and final removal that are technically and economically sustainable. To ide...
Autori: Neculai Mihailescu, Vasilica Daescu, Elena Holban, Mariana Nicoleta Badea, Jenica Paceagiu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25447

Abstract The waste recycling done in order to obtain composite products with performant properties and also, with long life cycle is the main purpose for the sustainable development. The present paper describes the way in which, different kind of solid wastes are immobilised in an organic resin as a binder matrix. Composites with different proportion of waste as, rubber/plastic, glass and silica sand have been obtained. The physical-mechanical properties and chemical stability of such organic...
Autori: Ioan Ropota, Emilia Zamfirache, Marcela Muntean
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25450

Abstract Mesoporosity of about 7 nm in ETS-10 titanosilicate was generated by postsynthesis treatment with hydrogen peroxide under microwave irradiation, resulting in an increased external surface area of the materials (55 m2/g). The influence of titanosilicate porosity and its surface modification by phosphorus atoms (ET(P)S-10) on the retention of some nanoions (??-emitting radioactive U(VI) and Th(IV) ions) and biomolecules (the proteins cytochrome c, papain, and ??-globulin) was investiga...
Autori: Robert Gradinaru, Sorin O. Valu, Stefan Postolache, Claudiu C. Pavel, Ion Sandu, Karin Popa
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25455

Abstract Knowledge of the binding mechanisms of heavy metals to cement minerals is essential for the prediction of the long-term leachability of cement-based solidified waste containing heavy metals. In this paper, the sorption of chromate ions onto calciumsilicate- hydrate (C-S-H) in equilibrated aqueous suspensions was investigated as a function of liquid-to-solid ratio. The hypothesis of super-equivalent adsorption was assumed to be involved in chromate ions immobilization. This hypothesis...
Autori: Constantin Bobirica, Ionel Constantinescu, Liliana Bobirica,
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25478

Abstract In order to reduce the cement content used in concrete production utilization of waste materials for substitution of a part of cement can be considered. In this study, two pozzolanic-waste materials, silica fume and fly ash, are used as a part of cement up to 12% and 40%, respectively in concrete and compressive strength as well as permeability properties were determined. The test results were evaluated by using the response surface method. By keeping the cement content in concrete c...
Autori: Dogan U. Anil, Ozkul M. Hulusi, Ekincioglu Ozgur
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25490

Abstract In the paper is analyzed the possibility of using some industrial wastes for obtaining new building materials. From the industry or from the power station a lot of by-products or wastes have resulted and their storage is a big problem for the environment. In the building material industry a part of these wastes can be used in different ways: for replacing the cement, as addition in concrete, as component of cements, in the mixture of polymer concrete, etc. In the present investigati...
Autori: Marinela Bărbuţă, Nicolae Taranu, Maria Harja
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25525

Abstract Sorption is one of the several methods that have been successfully utilized for dyes removal. A large number of materials have been used as suitable sorbents for decolourization of industrial effluents: activated carbon (the most common but expensive adsorbent), polymeric resins, various low-cost adsorbents (agricultural and industrial by-products, peat, chitin, silica, bentonite, other clays, fly ash). Our paper is a review about our researches regarding different types of industri...
Autori: Daniela Suteu, Carmen Zaharia, Augustin Muresan, Rodica Muresan, Alina Popescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25532

Abstract Chlorophenols are contaminants in soils, sediments, surface waters and groundwater, largely because of their worldwide utilization in the last 50 years as wood preservatives and general biocides in industry and agriculture. The toxicity of chlorophenols and their persistence in the environment require advanced treatment techniques for their removal. Surfactant-modified natural zeolites (SMZs) represent an important class of sorbents for water treatment. This work presents a comparat...
Autori: Roxana Elena Apreutesei, Cezar Catrinescu, Adrian Ungureanu,
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25537

Abstract Geopolymerization is a continuous developing field of research for utilizing solid waste and by-products. It provides a solution to many problems where hazardous residue has to be treated and stored under critical environmental conditions. Consumption of fly ash in the manufacture of geopolymer is an important strategy in making materials more environmentally friendly. Fly ash has been chosen as a base material in order to utilize this industrial waste. Previous researches have show...
Autori: Maria Harja, Marinela Bărbuţă, Maria Gavrilescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25542

Abstract In this work the experimental conditions to synthesize, by direct hydrothermal synthesis, self-bonded pellets of ETS-10 phase containing iron were studied. The following gel composition was used: xNa2O-0.6KF-1.28xHCl-yFe2O3-0.2TiO2-1.49SiO2-39.5H2O with 0.8Â???xÂ???1.4 and 0.015Â???yÂ???0.08. The products obtained were characterized through X-ray diffraction on powders (XRD), thermal analysis (TG, DSC, DTG), scanning electron microscopy (SEM) and microanalysis (EDS). The data obtai...
Autori: Pierantonio De Luca, Danilo Vuono, Monica Filice
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25544

Abstract The slags are an important waste and by-products of metallurgical industry. The present paper summarizes results obtained from physical and chemical analyses on metallurgical slag provided from S.C. ?Mittal Steel Galati? S.A. The physical structure and gradation of granulated slag depend on the chemical composition of the slag, its temperature at the time of water quenching, and the method of production. The following mineralogical components were noticed through bypowder X-ray diffr...
Autori: Maria Cioroi, Licuta Nistor Cristea, Igor Creţescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25588

Abstract Some samples consisting in silica functionalized in different degrees with dihydroxy-azomethine groups have been tested as sorbents for copper (II) ions from aqueous solutions in different conditions. An indirect monitoring procedure for the complexing process was approached: UV-VIS absorption intensity ? time variation for the metal-containing solution in which complexing silica was soaked. In order to find the conditions in which the maximum efficiency in the metal absorption can b...
Autori: Ciprian-George Piuleac, Maria Cazacu, Silvia Curteanu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25608

? GREEN SYNTHESIS OF SYMMETRICAL CARBONATE FT-IR STUDY ? SINTERED BASALT AS A PROMISING SUSTAINABLE MATERIAL IN MECHANICAL ENGINEERING ? DESIGN OF BUILDINGS INCLUDING ENVIRONMENTAL IMPACT ? ANALYSIS METHODS FOR PYRAZINE-2,3-DICARBOXYLIC ACID SYNTHESIZED USING ELECTROCHEMICALLY REGENERATED KMnO4 ? RESEARCH ON NaCl SALINE AEROSOLS II. NEW ARTIFICIAL HALOCHAMBER CHARACTERISTICS ? DETERMINATION OF AEROSOLS POLLUTANTS ON MEMBRANES. 1. MEMBRANES PREPARATION AND CHARACTERIZATIO...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25660

? HYDROGEL MICROSPHERES BASED ON ENVIRONMENTALLY FRIENDLY POLYMERS WITH POTENTIAL BIOMEDICAL APPLICATIONS ? STUDY ON THE MIXING EFFICIENCY IN A BASKET BIOREACTOR WITH IMMOBILIZED YEASTS CELLS ? MANAGEMENT OF WASTE FROM ELECTRICAL AND ELECTRONIC EQUIPMENT IN CYPRUS ? A CASE STUDY ? SEPARATION AND CHARACTERIZATION OF ANTHOCYANINS BY ANALYTICAL AND ELECTROCHEMICAL METHODS ? AN INTEGRATED DECISION AID FOR IDENTIFYING AND PRIORITIZING STRATEGIES IN FOREST MANAGEMENT ? INFLUEN...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25668

Abstract:Hybrid nanocomposites may synergistically combine and enhance the properties of inorganic nanoparticles and organicmolecules.The objective of this paper is to examine particular nanocomposites films based on binary copolymers and inorganic TiO2nanoparticles from the structure and properties point of view. These nanoparticles were dispersed in maleic anhydride-styrene(MAS) copolymer by using elaidic acid, trans isomer of the oleic acid, as coupling agent in order to increase the compatib...
Autori: Alina Matei, Dana Perniu, Ileana Cernica, Irina Popescu, Lucia Dumitrescu, Vasilica Schiopu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25755

The presence of pollutants in food raises some serious questions concerning their potential impact on consumers health, being necessary to monitor their distribution in the environment. The present work provides data regarding levels of organochlorine pesticides (lindane, p,p’- DDT, p,p’- DDE, p,p’- DDD, HCB, aldrin, dieldrin, endrin and hepthaclor) and PAHs: acenaphthene (Ace), acenaphthylene (Acy), fluorene (F), naphthalene (Np), anthracene (An), fluoranthene (Fl), phenanthrene (Ph), ben...
Autori: Alina Soceanu, Danut Tiberius Epure, Gabriela Stanciu, Simona Dobrinas, Viorica Popescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25905

AbstractThis paper continues the previous investigations regarding the technology for the Aluminum (Al) recovery as Al sulfate fromblack Al slag. Leaching is the next compulsory step in the Al extraction process. The paper studies the influence of mothersolutions´ (MS) recirculation resulted from the process within the system over the quality of Al sulfate and the siliceous residue(R) and, the aluminum nitride (AlN) hydrolyses in the leaching process. The optimum parameters determined are: *the ...
Autori: Romanita Teodorescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26250

AbstractInvestigations on thermochemical transformation of asbestos fibers followed by computer aided image analysis are presented.Asbestos Containing Wastes (ACW), notably asbestos-cement, were characterized before and after microwave heating withadditives aimed at reacting with and transforming asbestos fibers. Microprobe analysis helped determine the chemicalcompositions. X ray diffraction (XRD) was used to confirm decomposition of asbestos fibers during microwave heating. Electronparamagneti...
Autori: Yan Yvon
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26256

AbstractThis paper offers a case study of the seismic vulnerability assessment of existing buildings in 18 villages located in the Val d’Agri area (Basilicata region, Southern Italy). A building-by-building inventory was carried out within the urban areas of the villages by trained technicians in two periods collecting typological data for a total of about 17,500 buildings. In the first period (2001-2003), a purposely drawn up inspection form (VSP-2001) based on the usability form adopted in Ita...
Autori: Angelo Masi, Carmelinda Samela, Leonardo Chiauzzi, Luigi Tosco, Marco Vona
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26299

AbstractA series of experiments were performed to quantify the adsorption of Cesium on Silica impregnated withtrihexyl(tetradecyl)phosphonium chloride (Cyphos IL-101). Non-radioactive cesium solution was used as a surrogate of theradioactive 137Cs. The obtained impregnated Silica with the studied ionic liquid was characterized through scanning electronmicroscopy, energy dispersive X-ray analysis and Fourier transform infrared spectroscopy in order to put in evidence that theimpregnation with the...
Autori: Adina Negrea
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26473

AbstractAnalysis and monitoring of arsenic is still a challenging analytical task. Due to its complex behaviour (different forms of arsenicthat can be present depending on pH and oxidation states of arsenic) as well as demanding analytical procedures and instrumentaltools for control of arsenic concentration in drinking water which is set to 10 μg L–1, there are still some open questions andissues when arsenic is the scientific topic. In this paper the idea was to use a multivariate statist...
Autori: Vladana N. Rajakovic-Ognjanovic
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26506

Abstract Copper nanoparticles were successfully synthesized on polyether-functionalized mesoporous silica to investigate the effect of metal loading (10, 25 and 35 wt. % Cu) on their structural and catalytic properties. The oxide forms of these nanocomposite materials were thoroughly characterized by nitrogen physisorption, SAXS, WAXS, TEM, EDXS, and TPR, whereas the metallic forms were analysed by N2O chemisorption. The results indicated that the mesostructured SBA-15-like hybrids favoured ...
Autori: Constantin Rudolf
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26653

Abstract Maximum removal (94±1.2%) of 2, 4 dichlorophenol (50 mg.dm-3) was achieved on silica with agitation of 4 hours, at pH 8 and 42°C. The positive enthalpy (ΔH) and negative free energy values (ΔG315K) suggested the endothermic and a spontaneous nature of sorption. The free energy of the process at all temperature was negative and increased with the increase in temperature. The values of free energy suggested a spontaneous process where the spontaneity decreased w...
Autori: Abdul Ghaffar
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26718

Abstract Ash resulting from wood combustion constitutes a waste disposal problem to facility owners. The use of ash fertilizer or soil amendment could provide nutrients for agriculture if its nutrient content is adequate and it does not contain harmful amounts of heavy metals. The recycling of nutrients bound in ash would provide an inexpensive solution to waste problem. In our study, we aimed to characterize ash and clinker resulted from incineration of oak waste resulted from wood industry...
Autori: Ioan Oroian
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26885

Abstract Synthesized silicates and their organically modified products have been least explored for their potential use in contaminated water remediation and also as slow release formulations. In this study, adsorption potential and applicability of surfactant modified clinoptilolite (SMC) and montmorillonite (SMM) nanoparticles as adsorbent and slow release formulation of 2,4- dichlorophenoxyacetic acid (2,4-D) have been investigated. The surface modification of hydrothermally synthesized s...
Autori: Deepesh Bhardwaj
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26913

Fly ash is the major residue produced during the combustion of coal. Research has been carried out to recover silica and alumina from fly ashes collected from different thermal power plants in India. Silica and alumina from the fly ash were recovered and the recovered products were subjected to X-ray diffraction, X-ray fluorescence and Inductively Coupled Plasma-Optical Emission Spectroscopy analyses to estimate the silica and alumina content. Total recovered silica content in the samples was...
Autori: Ruth Sherly Endluri
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27007

In this study, the impact of silicate admixture in 2-line ferrihydrite on its sorption properties is presented. Synthetic ferrihydrites with broad Si content in the range of 0 to 1.5 Si/Fe molar ratios were prepared and characterized using X-ray diffractometry (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM-EDS). With an increase in the Si/Fe ratio, a typical XRD peak at 2.5Å broadens and shifts toward 3 Å; the position of Si-O stretchi...
Autori: Gabriela Pieczara
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27140

In this study, silica gel initially reacted with N-(2-aminoethyl)-3-aminopropyl-triethoxysilane and subsequently with formaldehyde resulted in a modified solid that contained amino imine groups, Sil2NCH2. The solids were characterized by CHN elemental analysis, thermogravimetric analysis (TGA/DTG), FTIR spectroscopy, 13C solid-state NMR, and nitrogen adsorption/desorption measurements. The adsorption of Cd(II), Pb(II) and Cr(VI) ions onto Sil2NCH2 in aqueous solutions were examined to study the ...
Autori: Franklin Pessoa Aguiar
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27242

In this study was synthesized MCM-41 mesoporous silica by hydrothermal treatment and funtionalized with titanium in order to obtain mesoporous materials with high surfacea area and photocatalytic activity in photodegradation of organic compounds as antibiotics. The functionalization of the synthesized support material was achieved by impregnation from alcoholic solution. The obtained materials (MCM-41) and (Ti-MCM-41) were characterized by X-ray diffraction (XRD), scanning electron microscopy (S...
Autori: Cristina Orbeci
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27274

Construction industries generate a large amount of concrete wash water every day, and it causes soil, surface water and ground water pollution. Therefore, re-using concrete wash water to produce fresh concrete is one of the solutions to prevent environmental pollution and to sustain water use. In this study, we tested setting time of cement, slump, compressive and tensile strength of 24 triplicate cubic samples of concrete with and without micro silica plus additive admixture using concrete wash...
Autori: Gholamreza Asadollahfardi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27389

This paper reports an improved chlorolignin (CL) oxidative decolorization in alkaline media by the use of a heterogeneous system consisting of hydrogen peroxide and a silica [bis(dibenzoylmethido) copper II] (S1) catalyst. The catalytic functions of S1 in the presence of H2O2 were evaluated by comparing the chlorolignin decolorization in media with and without addition of catalyst. Since decolorization is associated with CL degradation, the pH variation and chloride release assays were carrie...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27448

Thin-film transistor liquid-crystal display (TFT-LCD) waste glass can be used as a raw material for producing geopolymers, because it contains large amounts of silicon and aluminum in its amorphous structure. The setting time and compressive strength were evaluated to determine the quality of the geopolymer product with various amounts of nano-SiO2 (0%–3%) and TFT-LCD waste glass replacement (0% - 40%). The microstructures of the samples were characterized using mercury intrusion porosimet...
Autori: Kang Gao
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27634

The aim of this paper is to show the results of two methodological approaches applied for decontamination of the Midia Port dredged sediment to assess their potential reusability. Firstly, the sediment samples were defined in physical, chemical, microbiological and ecotoxicological terms. The results were compared to the limit values established by environmental regulations for dredged sediment management. Some sediment samples exposed a very high concentration of hydrocarbons; the sediments wer...
Autori: Irina Catianis
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27770

This paper investigated the compressive strength and thermal conductivity of water and air cured Portland cement-fly ash-silica fume mortars. The results showed that density, compressive strength and thermal conductivity of blended cement mortars with fly ash were lower than Portland cement control. However, blended cement mortars that contained silica fume as replacement cement both in binary and ternary phase were higher than fly ash mixes and tends to increase with increase silica fume used a...
Autori: Chalermphan Narattha
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27731

This study aims to monitor Volatile Organic Compounds (VOCs) and odour annoyance perceived by the exposed population living nearby a petroleum plant through an integrated high temporal resolution methodological approach. The area under investigation is considered one of the most critical industrial areas of the South of Italy (Basilicata) because of presence of the largest Italian petroleum plant, called the "Center Olio Val d'Agri" (COVA). In fact, VOCs and odours emitted from ext...
Autori: Alessia Di Gilio
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27791

The effect of synthesis conditions on sorptive properties of glycerol-derived mesoporous carbon materials were studied. Sorption properties of the synthesized carbon-based materials regarding to different adsorbate molecules, as well as water vapors, phenol and methylene blue molecules were analyzed. The sorption capacity of the synthesized mesoporous carbons depends upon synthesis conditions, namely upon pyrolyzing temperature and carbon precursor to silica weight ratio, being determined by ...
Autori: Maria Ignat
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27880

The main objective of this research is to investigate the effects of lime and waste silica fume additive on a silt and its utilization on railway subgrades stabilization. For this purpose, lime and waste silica fume were added to the silty soil in different contents at the soil optimum moisture; then the California Bearing Ratio (CBR) tests were conducted on the soil samples to estimate the favorable mixture design. At the next step, a selected sample was chosen to be exposed to wetting–dr...
Autori: Reza Ziaie Moayed
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27972

Building industry is a very large domain in the global economy and it has a lot of consequences over the environment through many and different aspects. These consequences are various, from the more and more extended area of construction up to gas emissions released during materials manufacture and transportation, construction process, exploitation of buildings and, finally, their deconstruction. The concrete, the most used material in construction industry all over the world, must become green...
Autori: Catalina Mihaela Gradinaru
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28138

There are considerable environmental and health and safety concerns regarding liquid crystal display (LCD) waste glass because of the waste electrical and electronic equipment (e-waste) that is deposited in landfills. In current study, the effect of variation in LCD waste glass on the deconvoluted fractions of silicon centers of metakaolin geopolymers has been comprehensively investigated to discover the underlying mechanisms governing the performance. Solid/liquid ratio affects the kinetics of ...
Autori: Kang-Wei Lo
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28146

The main goal of this work was to develop a cheap and easy method for the synthesis of the porous metallosilicate macrospheres. Zirconium silicate macrospheres with diameters in the range 1.5 – 1.6 mm were obtained by the spray gelling technique, using the multi templating method. Tetraethyl orthosilicate was used as silica source. The chitosan played a dual role (pore and shape generating agent), while other inexpensive and easily accessible biomaterials including yeast, sugar and gelatin...
Autori: Emil Ioan Mureșan
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28148

Sodium silicate, iron sulfate, magnesium sulfate, and zinc sulfate were used as the raw materials to prepare a new inorganic polymer flocculant, polysilicate ferric magnesium zinc (PSFMZ), using direct recombination. The effects of molar ratio of zinc to silicon, ratio of iron to magnesium, reaction temperature, and reaction time on deoiling rate were explored. The optimal synthesis conditions for the flocculant for the thermal-washing treatment of oily sludge were determined. Results showed tha...
Autori: Lanlan Yu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28165

LED waste quartz sand (LEDWS), which is a prominent by product of the LED manufacturing process, may contaminate the environment because it comprises specific heavy metals (e.g., As and Cu), which are hazardous ingredients to the environment when disposed of improperly. Therefore, this study investigated the use of light-emitting diode (LED) waste quartz sand to partially replace Portland Type I cement (OPC) to evaluate the feasibility of reusing it as a pozzolanic material. The SiO2, Na2O, and ...
Autori: Kae-Long Lin
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28207

Release of dyes without performing adequate treatment into the water can lead to environmental risk and serious health problems. The development of effective and economic adsorbent materials for the removal of dyes from industrial wastewaters has gained great consideration in recent years. In the present study, a novel bio-based nanocomposite has been developed for ultrasoundassisted adsorption of malachite green (MG) from aqueous solutions. The synthesized adsorbent consisting of both hydropho...
Autori: Mohsen Nekoeinia
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28232

Impregnation of aluminium ion onto silica gel (SG) surface (Al/SG) is to increase the adsorption capacity of an anionic dye such as Indigo carmine (IC). The impregnation was carried out using wetness impregnation. The change of the functional group was evaluated by FTIR, crystallinity was determined using XRD, surface morphology were studied by SEM-EDX, while surface area and pore size using N2 gas adsorption-desorption analyzer. Meanwhile, the best of IC adsorption condition onto SG and Al/SG ...
Autori: Yudi Aris Sulistiyo
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28253