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Rezultatele pentru chitosanRezultate gasite: 15
Application of polycations in separation processes
Environmental Engineering and Management Journal › Vol. 6 › Nr. 5 AbstractFlocculation performance of three chitosan samples with different viscosities (?§ = 400, 800 and 1000 mPas) and two strong synthetic polycations of integral type (PDADMAC and PCA5) on two model aqueous suspensions (kaolin and bentonite) was investigated. The flocculation results indicated that all the polycation samples were efficient in the kaolin flocculation, the turbidity being completely removed at approximately the same polycation dose; the flocculation window ranged between 2.7 an... Autori: Ecaterina Stela Dragan, Luminita Ghimici, Marcela Mihai ISSN: 1843 - 3707 http://www.ecozone.ro/reviste.php?RID=25201
Effects of coagulants on the DCS accumulation in process water of papermaking
Environmental Engineering and Management Journal › Vol. 7 › Nr. 3 AbstractAdvanced closing of paper machine circuits results in the accumulation of the dissolved and colloidal substances (DCS) in the process water. At a critical concentration, the DCS are destabilizing even by small variations in paper machine parameters, producing operational and product quality problems. This article presents results of lab experiments simulating the process water recycling in short circuit of paper machine, without and with addition of fixing agents. Tests were performing w... Autori: Dan Belosinschi, Elena Bobu ISSN: 1843 - 3707 http://www.ecozone.ro/reviste.php?RID=25261
Environmental Engineering and Management Journal, Vol. 8 Nr. 3
Environmental Engineering and Management Journal › Vol. 8 › Nr. 3 â€? Bioremediation of contaminated air using a bioscrubberâ€? Quality risk evaluation of the groundwater resources on the moldavian areaâ€? Electrochemical characterization of some dental materials in accelerated environmental testingâ€? Preliminary study of simple and Fenton oxidation with hydrogen peroxide applied on final effluents from a zootechnical farmâ€? The environmental impact assessment caused by the dykes failureâ€? Revaluation of beer industry byproducts – medical implicationsâ€? ... Autori: http://www.ecozone.ro/reviste.php?RID=25372
Preparation and characterization of sodium alginatechitosan microparticles for controlled release of ibuprofen in a sustainable way
Environmental Engineering and Management Journal › Vol. 8 › Nr. 3 Abstract
The preparation of microspheres containing chitosan, sodium alginate and ibuprofen and the pH dependent drug release were investigated. The microspheres were prepared by two experimental routes: the first one starting with a chitosan/ibuprofen core subsequently coated by an alginate shell (S1) and the second one based on an alginate/ibuprofen core, later coated by a chitosan layer (S2). The physical-chemical characterization was done by using Dynamic Light Scattering (DLS), Atomic Fo... Autori: Luminiţa Elena Balău, Nicolae Aelenei, Marcel Ionel Popa ISSN: 1843 - 3707 http://www.ecozone.ro/reviste.php?RID=25412
COATING FERTILIZER GRANULES WITH BIODEGRADABLE MATERIALS FOR CONTROLLED FERTILIZER RELEASE
Environmental Engineering and Management Journal › Vol. 13 › Nr. 10 Abstract
Biodegradable chitosan was used to cover fertilizer granules with an inert, impermeable layer in order to obtain a material with
controlled release properties. The process was performed in a laboratory drum granulator. Prepared materials were characterized
with available analytical methods (XRD, optical microscopy). The layer thickness of the obtained materials was in the range of
0.047 – 0.5425 mm. The degree of nutrients' release (0.64-0.965 within five hours) were deter... Autori: Krzysztof Lubkowski ISSN: 1843 - 3707 http://www.ecozone.ro/reviste.php?RID=26583
SYNTHESIS AND BIOEVALUATION OF MAGNETIC PARTICLES BASED ON CHITOSAN AND PHYTOCOMPONENTS FROM Eugenia carryophyllata AQUEOUS EXTRACT
Environmental Engineering and Management Journal › Vol. 14 › Nr. 4 Abstract
In this study we report the preparation and evaluation of the antimicrobial activity of a new hybrid material based on chitosan
(CH), magnetite (Fe3O4) and phytocomponents from the Eugenia carryophyllata aqueous extract (AE). CH/Fe3O4 was prepared
by chemical precipitation of Fe2+ and Fe3+ ions in aqueous solution of sodium hydroxide and CH. E. carryophyllata’s dried buds
were hydrodistilled under microwave conditions. The AE was separated in three equal parts, one for the chl... Autori: Ion Anghel ISSN: 1843 - 3707 http://www.ecozone.ro/reviste.php?RID=26707
STUDIES ON GLUTARALDEHYDE CROSSLINKED XANTHATED CHITOSAN TOWARDS THE REMOVAL OF MERCURY (II) FROM CONTAMINATED WATER STREAMS
Environmental Engineering and Management Journal › Vol. 14 › Nr. 5 Abstract
Chitosan was cross linked with gluteraldehyde and chemically modified by introducing xanthate group onto its backbone using
carbon disulfide under alkaline conditions. This crosslinked xanthated chitosan flakes (XC) was used as an adsorbent for the
removal of mercury ions from contaminated water streams near the coal mines. XC was found to be far more efficient than the
conventionally used adsorbent activated carbon. FTIR studies indicated the interaction both amine and the xanthate... Autori: Avinash Gupta ISSN: 1843 - 3707 http://www.ecozone.ro/reviste.php?RID=26725
A NEW KINETIC AND THERMODYNAMIC APPROACH TO PHENOL BIOSORPTION BY CHITOSAN AND KERATIN
Environmental Engineering and Management Journal › Vol. 14 › Nr. 5 Abstract
Chitosan and keratin were tested as low cost biosorbents to remove phenol from water solutions at variable temperature (20-
50°C), initial phenol concentration (10-90 mg L-1) and pH (5.0-10.0), and fixed biosorbent dosage (10 g L-1). The pseudo-second
order kinetic model exhibited the best fit to the experimental data and allowed estimating theoretical values of sorption capacity
of 4.51 mg g-1 with keratin and 2.87 mg g-1 with chitosan. Equilibrium isotherms, described at best ... Autori: Attilio Converti ISSN: 1843 - 3707 http://www.ecozone.ro/reviste.php?RID=26743
NEW NATURAL BIOCOMPATIBLE MATERIALS OBTAINED BY AN ENVIRONMENTALLY FRIENDLY TECHNOLOGY, WITH APPLICATIONS IN WOUND-HEALING
Environmental Engineering and Management Journal › Vol. 14 › Nr. 9 Abstract
In rural areas of Romania and other developing countries wounds and dermal affections represent one of the five most common
reasons for people seeking medical care. The use of traditional medicines to treat many of these conditions has received little
research or policy attention. The present work addresses the discovery of non-toxic treatments for dermal affections, and aims to
prepare – based an environmentally friendly technology, and characterize hydrogels based on gelatin... Autori: Călin Vasile Andriţoiu ISSN: 1843 - 3707 http://www.ecozone.ro/reviste.php?RID=26842
USE OF CHITOSAN-IRON(III) FOR THE ADSORPTION OF THE DYE ACID RED 29: ISOTHERM, KINETIC, REUSE AND FACTORIAL DESIGN
Environmental Engineering and Management Journal › Vol. 15 › Nr. 11 In this study, chitosan-iron(III) was used as adsorbent of the dye acid red 29. The effect of pH, temperature and concentration of the dye on the adsorption capacity were evaluated. The maximum adsorption capacity was calculated from the adsorption isotherms which were well fitted by Sips isotherm model. The process followed the kinetic model of pseudo-second-order. The activation parameters showed that the adsorption process is spontaneous and favorable. A decrease in adsorption capacity was ob... Autori: Carla Albertina Demarchi ISSN: 1843 - 3707 http://www.ecozone.ro/reviste.php?RID=27181
CHITOSAN-BASED ADSORBENTS GELS FOR THE REMOVAL OF TRIS-AZO DYE: ISOTHERMS AND KINETICS STUDIES
Environmental Engineering and Management Journal › Vol. 15 › Nr. 11 The adsorbent gels utilized in this research project were synthesized from non-commercially available chitosan, obtained by deacetylation of chitin, which was isolated from fermented shrimp waste by a major local industrial food biopolymer. Chitosan-based adsorbent gels were used for the removal of a tris-azo dye (Direct Blue 71) from aqueous solutions. Sorption experiments focused on the chemical modification of chitosan using two cross-linking agents, sodium tripolyphosphate (TPP) and glutaral... Autori: Reyna G. Sánchez-Duarte ISSN: 1843 - 3707 http://www.ecozone.ro/reviste.php?RID=27184
REMOVAL OF TURBIDITY AND HUMIC ACIDS USING CHITOSAN AS A COAGULANT AID: MODELING WITH ARTIFICIAL NEURAL NETWORK
Environmental Engineering and Management Journal › Vol. 16 › Nr. 1 In the present study, the effect of chitosan as an eco-friendly coagulant aid was investigated for removing turbidity (bentonite) and humic acid (HA) in the coagulation process. The effects of various operational parameters such as initial pH of the solution (4-9), dosage of chitosan (1-4.5 mg/L), dosage of alum (10-40 mg/L) and initial turbidity (10-150 NTU) were investigated. An artificial neural network (ANN) model was used to predict the performance of turbidity removal efficiencies by coagu... Autori: Abdolmotaleb Seid Mohammadi ISSN: 1843 - 3707 http://www.ecozone.ro/reviste.php?RID=27223
EFFECT OF METAL TOLERANT PLANT GROWTH PROMOTING RHIZOBACTERIA ON BEAN GROWTH, CADMIUM AND ZINC UPTAKE AND STRESS RESPONSES
Environmental Engineering and Management Journal › Vol. 17 › Nr. 4 Plant growth promoting rhizobacteria (PGPR) serve as an alternative tool in sustainable agriculture. PGPR influence the heavy metal accumulation of crops in contaminated soils, either by decreasing or increasing the accumulation. This study focuses on the effect of plant growth-promoting rhizobacteria on the heavy metal uptake, plant growth and stress response of bean plants. The simultaneous treatment of Cd2+ and Mitsuaria chitosanitabida T310-2/4 (PGPR strain) as well as Zn2+ and bacteria resu... Autori: Éva Boglárka Vincze ISSN: 1843 - 3707 http://www.ecozone.ro/reviste.php?RID=27554
MACROSPHERICAL POROUS METALLOSILICATE MATERIALS: CHARACTERIZATION AND APPLICATIONS
Environmental Engineering and Management Journal › Vol. 19 › Nr. 2 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 MureČ™an ISSN: 1843 - 3707 http://www.ecozone.ro/reviste.php?RID=28148
FIXED-BED COLUMN STUDY OF DIAZINON ADSORPTION ON THE CROSS-LINKED CHITOSAN/CARBON NANOTUBE
Environmental Engineering and Management Journal › Vol. 19 › Nr. 3 Adsorption of diazinon from aqueous solution was studied by using cross-linked Chitosan/Carbon Nanotube (CHN-CNT) in a fixed-bed column. The cross linked CHN-CNT with 2.5% of MWCNT was prepared with a protected crosslinking method. The effects of the initial concentration of diazinon, bed-height, and flow rate on the adsorption of diazinon onto the cross linked CHN-CNT were investigated. The highest bed capacity of 29.47 mg/g was obtained at the initial concentration of 50 mg/L, flow rate of 10.... Autori: Tahere Taghizade Firozjaee ISSN: 1843 - 3707 http://www.ecozone.ro/reviste.php?RID=28174 |