Removal of manganese from water by electrocoagulation: Adsorption, kinetics and thermodynamic studies

Pandian Ganesan, Jothinathan Lakshmi, Ganapathy Sozhan, Subramanyan Vasudevan

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

The present study provides an electrocoagulation process for the removal of manganese (Mn) from water using magnesium as anode and galvanised iron as cathode. The various operating parameters like effect of initial pH, current density, electrode configuration, inter-electrode distance, coexisting ions and temperature on the removal efficiency of Mn were studied. The results showed that the maximum removal efficiency of 97.2% at a pH of 7.0 was achieved at a current density 0.05A/dm2 with an energy consumption of 1.151kWhr/m3. Thermodynamic parameters, including the Gibbs free energy, enthalpy and entropy, indicated that the Mn adsorption of water on magnesium hydroxides was feasible, spontaneous and endothermic. The experimental data were fitted with several adsorption isotherm models to describe the electrocoagulation process. The adsorption of Mn preferably fitting the Langmuir adsorption isotherm suggests monolayer coverage of adsorbed molecules. In addition, the adsorption kinetic studies showed that the electrocoagulation process was best described using the second-order kinetic model at the various current densities.

Original languageEnglish
Pages (from-to)448-458
Number of pages11
JournalCanadian Journal of Chemical Engineering
Volume91
Issue number3
DOIs
Publication statusPublished - Mar 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

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