TEOS as an improved alternative for chitosan beads cross-linking: A comparative adsorption study

ABSTRACT In this work the use of tetraethoxysilane (TEOS) for cross‐linking of chitosan hydrogel beads was studied at the level of 1 mmol TEOS per gram of chitosan. They were compared with glutaraldehyde and epichlorohydrin cross‐linked beads. The hydrogels were characterized by FTIR, SEM, water con...

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Bibliographic Details
Published in:	Journal of applied polymer science Vol. 131; no. 21; pp. np - n/a
Main Authors:	Copello, Guillermo J., Villanueva, María E., González, Joaquín A., López Egües, Sofía, Diaz, Luis E.
Format:	Journal Article
Language:	English
Published:	Hoboken, NJ Blackwell Publishing Ltd 05-11-2014 Wiley Wiley Subscription Services, Inc
Subjects:	Adsorption Applied sciences Beads Charge Chitosan Crosslinking Epichlorohydrin Exact sciences and technology Glutaraldehyde Hydrogels kinetics Materials science Natural polymers Organic polymers Physicochemistry of polymers Polymers polysaccharides Properties and characterization Solution and gel properties Starch and polysaccharides polysaccharides adsorption Liquid solid adsorption Adsorption capacity Metal ion Crosslinking Experimental study Organic adsorbent Colloidal gel Particle Chitosan derivatives Cadmium II Azo dye Oside polymer Property structure relationship Chitosan Kinetics Hydrogel Silicon polymer Organic silicate
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Summary:	ABSTRACT In this work the use of tetraethoxysilane (TEOS) for cross‐linking of chitosan hydrogel beads was studied at the level of 1 mmol TEOS per gram of chitosan. They were compared with glutaraldehyde and epichlorohydrin cross‐linked beads. The hydrogels were characterized by FTIR, SEM, water content, nitrogen content, and their point of zero charge. The performance of the anionic dye Remazol Black (RB) and the cationic Cd(II) adsorptions was assessed in order to characterize the sorbate–sorbent interaction. Adsorption experimental data were analyzed using two‐ and three‐parameter isotherm models along with the evaluation of mean adsorption energy and standard free energy. The adsorption was observed to be pH dependent. The uptake rate of RB and Cd(II) showed that the three type of beads followed a similar kinetic behavior. For both sorbates the TEOS cross‐linked beads showed the higher maximum adsorption capacity, followed by epichlorohydrin and glutaraldehyde cross‐linked beads. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41005.
Bibliography:	ArticleID:APP41005 istex:15B210915B2AF9C87D9EBF09FAE29F00272FCDE9 ark:/67375/WNG-ZFGS9RC0-F ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0021-8995 1097-4628
DOI:	10.1002/app.41005