Biosorption of As(III) and As(V) on the surface of TW/MnFe2O4 composite from wastewater: kinetics, mechanistic and thermodynamics

M S Podder,C B Majumder

doi:10.1007/s13201-016-0487-z

M S Podder, C B Majumder

Open Access

https://doi.org/10.1007/s13201-016-0487-z

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Journal: Applied Water Science	Publication Date: Oct 25, 2016
Citations: 24	License type: open-access

Affiliation: Indian Institute of Technology Roorkee

Abstract

In the present study, TW/MnFe2O4 composite (MTW) was synthesized and estimated as an effective biosorbent for removing As (III) and As(V) from wastewater. Physicochemical analysis of composite was performed through SEM–EDX. 86.615 and 83.478% removal efficiency were obtained by composite dosage of 2 g/L at contact time 120 min at temperature 30 °C and pH 7.0 and 4.0 for As(III) and As(V), respectively. Kinetic results study showed that Brouers–Weron–Sotolongo and Ritchie second-order for As(III) and Brouers–Weron–Sotolongo model for As(V) were capable to describe an accurate explanation of adsorption kinetic. Applicability of mechanistic models in the current study exposed that the rate-controlling step in the biosorption of both As(III) and As(V) on the surface of composite was film diffusion rather than intraparticle diffusion. The estimated thermodynamic parameters ΔG0, ΔH0 and ΔS0 revealed that the biosorption of both As(III) and As(V) on the composite was feasible, spontaneous and exothermic.

Highlights

Contamination of natural arsenic (As) in water supplies is a main environmental and health problem on a worldwide scale
Physicochemical analysis of composite was performed through Scanning electron microscope (SEM)–energy-dispersive X-ray (EDX). 86.615 and 83.478% removal efficiency were obtained by composite dosage of 2 g/L at contact time 120 min at temperature 30 °C and pH 7.0 and 4.0 for As(III) and As(V), respectively
Kinetic results study showed that Brouers–Weron–Sotolongo and Ritchie second-order for As(III) and Brouers–Weron–Sotolongo model for As(V) were capable to describe an accurate explanation of adsorption kinetic

Summary

Introduction

Contamination of natural arsenic (As) in water supplies is a main environmental and health problem on a worldwide scale. The attentive selection of the most suitable replacements should be on the basis of a cost-benefit analysis done for each one of the potential removal techniques At this stage, development in the awareness of biosorption has gained robust consistency during recent years due to its ecofriendly nature, very profitable, exceptional performance, vigorous process and less costly domestic practice for remediating even tremendously metal-contaminated water (Volesky 2001). The purposes of the present study, divided into six parts, were (1) to characterize the prepared TW/MnFe2O4 composite with BET surface area and SEM–EDX, (2) to examine the influence of contact time in addition to temperature for removing As(III) and As(V) from synthetically prepared copper smelting wastewater, (3) to evaluate the kinetics and mechanism of present biosorption process, (4) to examine the biosorption thermodynamics to identify the biosorption mechanism, (5) to investigate the influence of initial arsenic concentration on biosorption kinetics and (6) to verify the influence of temperature on biosorption kinetics

Materials and methods

Exponential kinetic model qt ÀÂ qe In 2:72 À 1:72

Results and discussion

Conclusions