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International Journal of Environmental Sciences
Year : 2013, Volume : 4, Issue : 1
First page : ( 113) Last page : ( 122)
Online ISSN : 0976-4402.
Article DOI : 10.6088/ijes.2013040100012

NPP-modified bentonite for adsorption of Ni (II) from aqueous solution and electroplating wastewater

Sandeep B.N., Suresha S.*

Department of Environmental Science, Yuvaraja's College, University of Mysore, Mysore-570 005, Karnataka, India

*Email id: sureshakumar12@yahoo.com

Online published on 11 December, 2013.

Abstract

Application of sodium pyrophosphate modified bentonite (NPP-bentonite) for adsorption of Ni (II) from aqueous solution and electroplating wastewater was investigated. Batch experiments were carried out to find the effect of pH, adsorbent dose, contact time and initial metal ion concentration. Maximum Ni (II) adsorption of 87.30% was achieved at pH 6.0 with adsorbent dose of 2 g/L with contact time of 120 min and initial metal ion concentration of 50 mg/L. The equilibrium adsorption data fitted well to Langmuir and Freundlich isotherm models with Langmuir monolayer adsorption capacity of 30.30 mg/g and Freundlich adsorption capacity of 3.98 (mg/g)/(mg/L)1/n. The practical applicability of NPP-bentonite as potential adsorbent for Ni (II) removal from electroplating wastewater has been proved.

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Keywords

NPP-bentonite, Adsorption, Nickel, Isotherm, Electroplating wastewater.

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