Removal of Hexavalent Chromium from Wastewater Using a New Composite Chitosan Biosorbent

A new composite chitosan biosorbent was prepared by coating chitosan, a glucosamine biopolymer, onto ceramic alumina. The composite bioadsorbent was characterized by high-temperature pyrolysis, porosimetry, scanning electron microscopy, and X-ray photoelectron spectroscopy. Batch isothermal equilibr...

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Bibliographic Details
Published in:Environmental science & technology 2003-10, Vol.37 (19), p.4449-4456
Main Authors: Boddu, Veera M, Abburi, Krishnaiah, Talbott, Jonathan L, Smith, Edgar D
Format: Article
Language:English
Subjects:
Adsorption
Aluminum Oxide - chemistry
Applied sciences
Biological and medical sciences
Biological treatment of waters
Biotechnology
Carcinogens, Environmental - isolation & purification
Chelating Agents - chemistry
Chitin - analogs & derivatives
Chitin - chemistry
Chitosan
Chromium
Chromium - isolation & purification
Environment and pollution
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Industrial applications and implications. Economical aspects
Industrial wastewaters
Models, Theoretical
Pollution
Temperature
Waste materials
Wastewaters
Water Purification - methods
Water treatment
Water treatment and pollution
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Summary:A new composite chitosan biosorbent was prepared by coating chitosan, a glucosamine biopolymer, onto ceramic alumina. The composite bioadsorbent was characterized by high-temperature pyrolysis, porosimetry, scanning electron microscopy, and X-ray photoelectron spectroscopy. Batch isothermal equilibrium and continuous column adsorption experiments were conducted at 25 °C to evaluate the biosorbent for the removal of hexavalent chromium from synthetic as well as field samples obtained from chrome plating facilities. The effect of pH, sulfate, and chloride ion on adsorption was also investigated. The biosorbent loaded with Cr(VI) was regenerated using 0.1 M sodium hydroxide solution. A comparison of the results of the present investigation with those reported in the literature showed that chitosan coated on alumina exhibits greater adsorption capacity for chromium(VI). Further, experimental equilibrium data were fitted to Langmuir and Freundlich adsorption isotherms, and values of the parameters of the isotherms are reported. The ultimate capacity obtained from the Langmuir model is 153.85 mg/g chitosan.
ISSN:0013-936X
1520-5851
DOI:10.1021/es021013a