Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/201125
Type: Artigo de periódico
Title: Pyridine Derivative Covalently Bonded On Chitosan Pendant Chains For Textile Dye Removal.
Author: Oliveira, Cintia S
Airoldi, Claudio
Abstract: Chitosan was chemically modified through a sequence of four reactions with immobilized 2-aminomethylpyridine at the final stage, after prior protection of amino group with benzaldehyde. The characterized biopolymers containing free amino and hydroxyl active centers on the biopolymeric structure and pyridinic nitrogen on pendant chains showed combined hydrophobic properties that can potentially favor interactions. Reactive Yellow GR and Blue RN dyes gave the maximum sorption capacities of 2.13 and 1.61 mmol g(-1), which were performed as functions of contact time, concentration and dye structure. However, biopolymer/dye interactions are governed by effective hydrogen bond and van der Waals forces for such structural adjustments. The data obtained from the concentration isotherm were applied to non-linear regressions of the Langmuir, the Freundlich and the Sips models, with the best fit to the latter model. The kinetic data was fitted to non-linear regression of pseudo-second-order, indicating that the sorption phenomena are most likely to be controlled by chemisorption process.
Subject: Biopolymers
Chitosan
Coloring Agents
Kinetics
Magnetic Resonance Spectroscopy
Pyridines
Spectrophotometry, Infrared
Textiles
Thermogravimetry
X-ray Diffraction
Chitosan
Dye
Non-linear Regression
Pyridine Derivative
Sorption
Rights: fechado
Identifier DOI: 10.1016/j.carbpol.2013.10.075
Address: http://www.ncbi.nlm.nih.gov/pubmed/24507253
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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