Biosorptive performance of Escherichia coli supported on Waste tea biomass (WTB) for removal of Cr(VI) to avoid the contamination of ground water: A comparative study between biosorption and SBB system

被引：17

作者：

Gupta, Ankur ^{[1
]}

Balomajumder, Chandrajit ^{[1
]}

机构：

[1] Indian Institute of Technology Roorkee, Roorkee

来源：

Groundwater for Sustainable Development | 2015年 / 1卷 / 1-2期

关键词：

1,5 diphenylcarbazide; Bacterial biofilm; Biosorption; Equilibrium isotherm; Kinetic model; Simultaneous biosorption and bioaccumulation (SBB); WTB;

D O I：

10.1016/j.gsd.2016.01.001

中图分类号：

学科分类号：

摘要：

The present study deals with simultaneous biosorption and bioaccumulation (SBB) batch system for the removal of hexavalent chromium Cr(VI) from aqueous solution using biofilm of Escherichia coli immobilized onto the surface of WTB. For comparison purpose the same study was carried out without bacterial biofilm using WTB as biosorbent. The effect of process parameters like pH, adsorbent dose, contact time, initial concentration of adsorbate on to the percentage removal of Cr(VI) has been determined for both SBB system and biosorption using WTB. The maximum percentage removal was found at pH 6-7 and temperature 37 °C. The adsorbent dose in case of SBB system was 15 g/L while in case of adsorption using WTB was 30 g/L at pH 7 and temperature 37 °C. A 99.99% removal of Cr(VI) at an initial concentration of 150 mg/L was obtained in both SBB system and biosorption using WTB but for the concentration greater than 150 mg/L, maximum percentage removal was obtained in SBB system which shows that SBB system at higher concentration of toxic pollutant is better than biosorption using WTB. Kinetic and equilibrium isotherm studies were performed to know the nature of biosorption. It was found that pseudo-second order model is followed in both cases with and without E. coli biofilm supported on WTB (SBB system and biosorption using WTB) indicating that chemisorption is the mechanism of biosorption. Here equilibrium isotherm study was also performed which shows that Langmuir isotherm was followed in case of SBB while Freundlich isotherm was followed in case of biosorption using WTB. © 2016 Elsevier B.V.

引用

页码：12 / 22

页数：10

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