Biosorption of arsenite (As+3) and arsenate (As+5) from aqueous solution by Arthrobacter sp. biomass

KS Prasad, AL Ramanathan, J Paul… - Environmental …, 2013 - Taylor & Francis
KS Prasad, AL Ramanathan, J Paul, V Subramanian, R Prasad
Environmental technology, 2013Taylor & Francis
In this study we investigated the role of arsenic-resistant bacteria Arthrobacter sp. biomass
for removal of arsenite as well as arsenate from aqueous solution. The biomass sorption
characteristics were studied as a function of biomass dose, contact time and pH. Langmuir,
Freundlich and Dubinin-Radushkevich (DR) models were applied to describe the
biosorption isotherm. The Langmuir model fitted the equilibrium data better than the
Freundlich isotherm. The biosorption capacity of the biomass for As+ 3 and As+ 5 was found …
In this study we investigated the role of arsenic-resistant bacteria Arthrobacter sp. biomass for removal of arsenite as well as arsenate from aqueous solution. The biomass sorption characteristics were studied as a function of biomass dose, contact time and pH. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models were applied to describe the biosorption isotherm. The Langmuir model fitted the equilibrium data better than the Freundlich isotherm. The biosorption capacity of the biomass for As+3 and As+5 was found to be 74.91 mg/g (pH 7.0) and 81.63 mg/g (pH 3.0), respectively using 1 g/L biomass with a contact time of 30 min at 28°C. The mean sorption energy values calculated from the D-R model indicated that the biosorption of As+3 and As+5 onto Arthrobacter sp. biomass took place by chemical ion-exchange. The thermodynamic parameters showed that the biosorption of As+3 and As+5 ions onto Arthrobacter sp. biomass was feasible, spontaneous and exothermic in nature. Kinetic evaluation of experimental data showed that biosorption of As+3 and As+5 followed pseudo-second-order kinetics. Fourier transform infrared spectroscopy (FT-IR) analysis indicated the involvement of possible functional groups (‒OH, ‒C\dbond O and ‒NH) in the As+3 and As+5 biosorption process. Bacterial cell biomass can be used as a biosorbent for removal of arsenic from arsenic-contaminated water.
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