Journal of Environmental Biology

Ecofriendly biosorption of dyes and metals by bacterial biomass of Aeromonas hydrophila RC1 

Siddhardha Busi*, Rahul Chatterjee, Jobina Rajkumari and Sairengpuii Hnamte

Centre for Microbiology, School of Life Sciences, Pondicherry University, Pondicherry - 605 014, India

*Corresponding Author E-mail: siddhardha.busi@gmail.com

Publication Data

Paper received:

08 December 2014

Revised received:

26 May 2015

Accepted:

08 August 2015

Abstract

The ability of dried bacterial biomass in azo dye and heavy metal removal from aqueous solution was explored. Biosorption of? three? textile dyes, Eriochrome black T (EBT), Acid Red? 26 (AR) and Trypan blue (TB) and heavy metals (Pb? and Cr) by dried biomass of Aeromonas hydrophila RC1, was investigated in a batch system under various parameters such as dye concentration,? contact time,? concentration of biomass, pH, and temperature. The experimental results showed that the extent of biosorption for dyes increased with increase in initial concentration of dyes, biomass concentration, contact time, temperature and decreased with increase in pH. The experimental isotherms data were analyzed using Langmuir and Freundlich isotherm equations. The Langmuir model yielded good fit to the experimental data (R² approximately 0.794, 0.844 and 0.969 for the dyes, EBT, AR and TB, respectively) with maximum monolayer adsorption capacity of 58.8 mg g^-1 for AR. Similarly results were obtained for heavy metals and the data fit in Langmuir model (R² value of 0.849 and 0.787) with qm value of 40 mg g^-1 for Pb. The results fit in pseudo first order kinetics with removal upto 96.67 % for Pb. Involvement of the surface characteristics of the biomass in biosorption was studied using scanning electron micrographs, FTIR, EDX and XRD analysis. Thus, use of A. hydrophila RC1 biomass can be extensively employed in water treatment plants in order to get desired water quality in the most economical way.? ??????  

 Key words

Aeromonas hydrophila RC1, Biosorption, Freundlich isotherm, Langmuir model 

Copyright ? 2016 Triveni Enterprises. All rights reserved. No part of the Journal can be reproduced in any form without prior permission. Responsibility regarding the authenticity of the data, and the acceptability of the conclusions enforced or derived, rest completely with the author(s).