Tiwary, R.K. and Ghosh, S.K. (1993) Managing aqueous solutions rich in Mn(II): An inexpensive technique. Colloids and Surfaces A: Physicochemical and Engineering Aspects , 70 (2). pp. 131-137. ISSN 0927-7757

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Abstract

The ability of fly ash to remove manganese from aqueous solutions by adsorption was investigated. The extent of removal was dependent on concentration, pH and temperature of the solution. The applicability of the Langmuir isotherm to the fly ash-manganese system was tested at 30°C and pH 8.0. These were the optimum conditions for maximum removal. The values of the adsorptive capacity Q0 and bonding constant bwere found to be 0.20 mg g−1 and 1.25 mg−1 respectively under the above conditions. With an initial concentration of 1.0 mg l−1 and at 30°C and pH 8.0, the removal was found to be 80.0%. The time to reach equilibrium was 2 h. The process of uptake is governed by first-order rate kinetics and under optimum conditions the rate constant of the reaction was found to be 2.40•10−2 min−1. The pH dependence study revealed that at pH 8.0 the uptake was 80.0% but at pH 9.0, 99.0% removal was found. The higher uptake at pH 9.0 was attributed to adsorption coupled with hydrolysis followed by oxidation. The dibasic behaviour of fly ash also facilitated Mn(II) adsorption at higher pH owing to the low pH required for constant zeta potential.

Item Type:	Article
Uncontrolled Keywords:	Adsorption; fly ash; inexpensive; Mn(II); pH
Subjects:	Envieronmental Management Group
Divisions:	UNSPECIFIED
Depositing User:	Dr. Satyendra Kumar Singh
Date Deposited:	27 Jan 2012 06:31
Last Modified:	27 Jan 2012 06:31
URI:	http://cimfr.csircentral.net/id/eprint/798

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