Chromium (VI) biosorption by immobilized Aspergillus niger in continuous flow system with special reference to FTIR analysis.
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Date
2010-09
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Abstract
Aspergillus niger was treated with acid and immobilized in calcium alginate matrix. The dynamic removal of Cr (VI) ion was
studied using continuously fed column packed with immobilized biosorbent beads. Column experiments were carried out to study the effect
of various bed heights (20, 30, 40 cm) under different flow rates (5, 7.5, 10 ml min-1) on efficiency of biosorption. The maximum time (1020
minutes; 17 hr) before breakthrough point was observed in case of 40 cm bed height with flow rate of 5ml min-1. FTIR analysis of acid
treated immobilized A.niger was used for a qualitative and preliminary analysis of chemical functional groups present on its cell wall which
provided the information on nature of cell wall and Cr (VI) interaction during the process of biosorption. The IR spectra of biosorbent recorded
before and after chromium biosorption had shown some changes in the band patterns, which were finally analyzed and was found that
chemical interaction such as ion-exchange between carboxyl (-COOH), hydroxyl (-OH) and amine (-NH2) group of biosorbent and
Chromium ion were mainly involved in biosorption of Cr (VI) onto A. niger cell wall surface. The biosorbed metal was eluted from biosorbent
by using 0.1 M H2SO4 as eluant. Immobilized biosorbent could be reused for, five consecutive biosorption and desorption cycles without
apparent loss of efficiency after its reconditioning. Considering all above factors together this paper discusses the efficient chromium
biosorption process carried out by immobilized A. niger biosorbent.
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Keywords
Aspergillus niger, Chromium, Biosorbent, Heavy metal
Citation
Chhikara S, Hooda A, Rana L, Dhankhar R. Chromium (VI) biosorption by immobilized Aspergillus niger in continuous flow system with special reference to FTIR analysis. Journal of Environmental Biology. 2010 Sept; 31(5): 561-566.