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Tamer T.M.,Advanced Technologies and New Materials Research Institute | Omer A.M.,Advanced Technologies and New Materials Research Institute | Mohy Eldin M.S.,Advanced Technologies and New Materials Research Institute | Mohy Eldin M.S.,University of Jeddah
Desalination and Water Treatment | Year: 2016

Adsorption of anionic reactive dye (methyl orange) onto cross-linked Chitosan derivate Schiff bases obtained from the coupling of Chitosan with 1-vinyl 2- pyrrolidone [Schiff base (I)] and 4-amino acetanilide (Schiff base (II)) in aqueous solutions was investigated using batch mode under various parameters. The structure of the prepared new Schiff bases was characterized using FT-IR and thermal gravimetric analysis. A batch experiment was conducted to study the process of Methyl orange dye adsorption from aqueous solutions using new Chitosan Schiff bases (I) and (II) comparing to cross-linked Chitosan. The influence of contact time, initial dye concentration, temperature, system pH, agitation speed, and adsorbent dosage on dye adsorption investigated. The experimental results showed that the maximum % dye removal obtained at pH 7 (pH 8 in the case of Schiff base (I)), temperature 80°C, 250 rpm, and contact time 70 min. The adsorption equilibrium data analyzed by Langmuir and Freundlich isotherm models. Langmuir model describes the equilibrium information and fitted perfectly. The experimental kinetics data were well suited and found that the kinetics of the removal of methyl orange dye using the prepared sorbents follows a pseudo-first-order model. © 2016 Balaban Desalination Publications. All rights reserved.


Mohy Eldin M.S.,Advanced Technologies and New Materials Research Institute | Soliman E.A.,Advanced Technologies and New Materials Research Institute | Hashem A.I.,Ain Shams University | Tamer T.M.,Advanced Technologies and New Materials Research Institute
Advances in Polymer Technology | Year: 2012

This study concerns the improvement in the antimicrobial activity of new aminated chitosan derivatives. p-Benzoquinone (PBQ) conjugated chitin was first prepared and then reacted with ethylenediamine (EDA) to get aminated chitin. The latter was finally deacetylated to get new aminated chitosan derivatives. Factors affecting conjugation and amination steps were studied. The amination process was confirmed by using FT-IR, TGA analysis, and the solubility test. The new aminated chitosan derivatives show a higher solubility, almost double, at a pH ranging from 5 to 6 compared with z pristine chitosan. The antibacterial activity of the chitosan derivatives was tested against four different bacterial strains: two Gram-negative (Escherichia coli and Pseudomonas aeruginosa) and two Gram-positive (Bacillus cereus andStaphylococcus aureus). It was found that the antibacterial activity of the chitosan derivatives is better than those of chitosan and increases with the increasing amount of introduced amine groups. Furthermore, the cytotoxicity test using the Caco 2 cell line shows a moderate safety level for the new aminated chitosan derivatives. Chitosan derivatives show potential bactericidal activity against all strains examined especially against Gram-negative bacteria (E. coli and P. aeruginosa). For Gram-positive bacteria, chitosan derivatives killed 93% of B. cereus and 92% of S. aureus, compared with 44% and 85% for chitosan after 3 and 5 h, respectively. © 2011 Wiley Periodicals, Inc. Adv Polym Techn 31: 414-428, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/adv.20264 Copyright © 2011 Wiley Periodicals, Inc.

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