The present study reports the optimum conditions for intercalating the Al3+ species to bentonite clay matrices and evaluate the potential of using Al3+-modified bentonite clay (Alum-Bent) for removal of oxyanionic species of As, B, Cr, Mo and Se from coal fly ash (FA) leachates. Removal of oxyanionic species was done in batch experimental procedures. Parameters optimized were: contact time, adsorbent dosage, concentration and pH. The adsorption affinity of Al3+-bentonite clay for oxyanionic species varied as follows: B ≈ Se > Mo > Cr ≈ As respectively. The adsorption data fitted better to Langmuir adsorption isotherm than Freundlich adsorption isotherm hence confirming mono-site adsorption. The adsorption kinetics fitted well pseudo-second-order kinetic model hence confirming chemisorption. The fact that most of the oxyanion were adsorbed at pH ≥ pHpzc indicated that both electrostatic and chemical interactions occurred with the clay surface and interlayers. The Al3+-modified bentonite clay successfully removed oxyanion species from generated coal FA leachates. This study shows that Al3+-modified bentonite clay is an effective adsorbent for oxyanion species in coal FA leachates and could be applied as a reactive barrier in coal FA retention ponds.
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Research Article|
March 01 2017
Simultaneous sorption of As, B, Cr, Mo and Se from coal fly ash leachates by Al3+-pillared bentonite clay: implication for the construction of activated geo-synthetic clay liner Available to Purchase
Vhahangwele Masindi;
Vhahangwele Masindi
*
aDepartment of Ecology and Resources Management, School of Environmental Sciences, University of Venda, P/bag X5050, Thohoyandou 0950, South Africa
bCSIR (Council of Scientific and Industrial Research), Built Environment, Hydraulic and Infrastructure Engineering (HIE), P.O Box 395, Pretoria 0001, South Africa
cDepartment of Environmental Sciences, School of Agriculture and Environmental Sciences, University of South Africa (UNISA), P. O. Box 392, Florida 1710, South Africa
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W. Mugera Gitari;
W. Mugera Gitari
aDepartment of Ecology and Resources Management, School of Environmental Sciences, University of Venda, P/bag X5050, Thohoyandou 0950, South Africa
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Hlanganani Tutu
Hlanganani Tutu
dMolecular Science Institute, School of Chemistry, University of Witwatersrand, P/Bag X4, WITS, Johannesburg 2050, South Africa
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Water Practice and Technology (2017) 12 (1): 186–201.
Citation
Vhahangwele Masindi, W. Mugera Gitari, Hlanganani Tutu; Simultaneous sorption of As, B, Cr, Mo and Se from coal fly ash leachates by Al3+-pillared bentonite clay: implication for the construction of activated geo-synthetic clay liner. Water Practice and Technology 1 March 2017; 12 (1): 186–201. doi: https://doi.org/10.2166/wpt.2017.023
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