Chromium(VI) biosorption and bioaccumulation by Live and acid-modified biomass of a novel morganella morganii isolate
Date
2014Source Title
Separation Science and Technology (Philadelphia)
Print ISSN
0149-6395
Publisher
Taylor and Francis
Volume
49
Issue
6
Pages
907 - 914
Language
English
Type
ArticleItem Usage Stats
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Abstract
Conventional methods of chromium removal are often insufficient for the remediation of chromium-contaminated natural environments, necessitating the development of alternative strategies. In this paper, we report the isolation of a novel Morganella morganii strain capable of reducing hexavalent chromium to its less-toxic and less-soluble trivalent form. Cr(VI) reduction by this strain was evaluated in both acidic environments and conditions reflecting natural freshwater sources. The isolate achieved equilibrium within 3 h and displayed a specific uptake rate of 24.30 ± 1.67 mg Cr(VI)/g biomass following HCl treatment. Without acid treatment, a reduction of over 90% was recorded within 72 h for an initial Cr(VI) concentration 20 mg/L, corresponding to a Cr(VI) removal capacity of 19.36 ± 1.89 mg/g. Absorption data of acid-treated STB5 biomass most closely followed the Toth and Langmuir models. FTIR results indicate that hydroxyl groups and extracellular or cell membrane polysaccharides may be potential adsorption sites for hexavalent chromium. Our results suggest that the isolate may be used in situ for treatment of polluted freshwater environments. Copyright © Taylor & Francis Group, LLC.
Keywords
BioaccumulationBiosorption
Chromium (VI)
Enterobacteriacea
heavy metal bioremediation
Morganella morganii
Bioaccumulation
Biochemistry
Biomass
Bioremediation
Biosorption
Cell membranes
Chromium compounds
Cytology
Heavy metals
Water
Acidic environment
Conventional methods
Enterobacteriacea
Freshwater environments
Freshwater sources
Hexavalent chromium
Morganella morganii
Natural environments
Chromium
Permalink
http://hdl.handle.net/11693/26447Published Version (Please cite this version)
https://doi.org/10.1080/01496395.2013.866681Collections
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