American Society of Civil Engineers


Arsenic (V) Sorption on Crab Shell Based Chitosan


by Hong Zhang, (Dept. of Civil and Environmental Engineering, University of Alaska Fairbanks, Fairbanks AK 99775 E-mail: fthz1@uaf.edu) and Silke Schiewer, (Dept. of Civil and Environmental Engineering, University of Alaska Fairbanks, Fairbanks AK 99775 E-mail: ffsos@uaf.edu)

pp. 1-7, (doi:  http://dx.doi.org/10.1061/40792(173)296)

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Document type: Conference Proceeding Paper
Part of: Impacts of Global Climate Change
Abstract: This research focuses on studying the sorption of As(V) on crab shell based chitosan. Chitosan contains amino groups, which appear to be responsible for the uptake of As(V). Additionally, the degree of deacetylation (DDA) of the sorbent, which determines both the amount of functional group and the crystallinity of the sorbent, is a very important factor in the sorption process. The DDA was determined by Fourier transform infrared spectroscopy (FTIR). The sorption studies suggest that maximum uptake occurs over the pH range 3–6. Adsorption isotherms indicate that the sorption capacity of the sorbent increased significantly with increasing degree of deacetylation (DDA) from 10% to 80%, but decreases as DDA approaches approximately 90%. These results suggest that chitosan can be used for treating As(V) contaminated waste-water.


ASCE Subject Headings:
Sorption
Fish management
Arsenic
Adsorption