Cr(VI) Sorption by Free and Immobilised Chromate-reducing Bacterial Cells in PVA-alginate Matrix: Equilibrium Isotherms and Kinetic Studies

Overview

Journal Environ Sci Pollut Res Int

Publisher Springer

Specialties Environmental Health
Toxicology

Date 2013 Jan 31

PMID 23361177

Citations 2

Authors

Monica Rawat

A P Rawat

Krishna Giri

J P N Rai

Affiliations

Soon will be listed here.

Abstract

Chromate-resistant bacterial strain isolated from the soil of tannery was studied for Cr(VI) bioaccumulation in free and immobilised cells to evaluate its applicability in chromium removal from aqueous solution. Based on the comparative analysis of the 16S rRNA gene, and phenotypic and biochemical characterization, this strain was identified as Paenibacillus xylanilyticus MR12. Mechanism of Cr adsorption was also ascertained by chemical modifications of the bacterial biomass followed by Fourier transform infrared spectroscopy analysis of the cell wall constituents. The equilibrium biosorption analysed using isotherms (Langmuir, Freundlich and Dubinin-Redushkevich) and kinetics models (pseudo-first-order, second-order and Weber-Morris) revealed that the Langmuir model best correlated to experimental data, and Weber-Morris equation well described Cr(VI) biosorption kinetics. Polyvinyl alcohol alginate immobilised cells had the highest Cr(VI) removal efficiency than that of free cells and could also be reused four times for Cr(VI) removal. Complete reduction of chromate in simulated effluent containing Cu(2+), Mg(2+), Mn(2+) and Zn(2+) by immobilised cells, demonstrated potential applications of a novel immobilised bacterial strain MR12, as a vital bioresource in Cr(VI) bioremediation technology.

Citing Articles

Removal of Chromium Species by Adsorption: Fundamental Principles, Newly Developed Adsorbents and Future Perspectives.

Liu B, Xin Y, Zou J, Khoso F, Liu Y, Jiang X Molecules. 2023; 28(2).

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Bacterial mechanisms for Cr(VI) resistance and reduction: an overview and recent advances.

Ahemad M Folia Microbiol (Praha). 2014; 59(4):321-32.

PMID: 24470188 DOI: 10.1007/s12223-014-0304-8.

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