Sequestration of Reactive Blue 4 by free and immobilized Bacillus subtilis cells and its extracellular polysaccharides

Colloids and Surfaces. B, Biointerfaces
Arthur Raj BinupriyaSoon-Il Yun

Abstract

Bacillus subtilis a gram positive bacteria and its extracellular polysaccharide were used in free form as well as immobilized form as biosorbent for sequestration of an anionic dye, Reactive Blue 4 (RB) in aqueous phase. The dye uptake enhanced with decrease in pH. Extracellular polymeric substances (EPS) and free cells were found to be better adsorbents when compared to alginate immobilized cells (IC) and EPS (IEPS). The presence of functional groups in free cells and EPS was confirmed by FT-IR analysis. Immobilization resulted in poor adsorption performance due to increase in mass transfer resistance by the polymeric matrix. High Q(max) and b values were noted in the case of free cells and free EPS in contrast to IC and IEPS. From the kinetic experiments, the adsorption system was found to be a pseudo-first-order reaction at low dye concentration. Desorption of RB was found to be 100% in 1N NaOH. However, the alginate beads were found to be unstable under high alkaline conditions of NaOH.

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Citations

Jun 12, 2012·Environmental Science and Pollution Research International·Emine Sayilgan, Ozgur Cakmakci
May 9, 2014·Bioprocess and Biosystems Engineering·Mathur Nadarajan KathiravanSi Wouk Kim
Nov 29, 2011·Colloids and Surfaces. B, Biointerfaces·G L DottoL A A Pinto
Feb 26, 2016·Canadian Journal of Microbiology·Sana Khan, Abdul Malik
Apr 13, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Ganta UpendarAbhishek Dutta
Jul 1, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jiafang CaiXiaomei Su

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