Treatment of manganese-containing mine water: adsorption onto metal oxide decorated bentonite
AbstractWater pollution by toxic metals from mining industries is a serious threat to living organisms and the environment. Therefore, it is important to effectively remove metal contaminants from water using appropriate treatment technologies. In this study, bentonite manganese oxide (BMnO) composite was prepared, characterized and evaluated for Mn2+ ions adsorption from aqueous solutions. Batch experiments were conducted to explore the effect of different experimental conditions on adsorption efficiency. The adsorption of Mn was reasonably fast and the kinetic data fitted well with the pseudo-second-order model. Equilibrium results showed that increasing the solution pH and adsorbent dose, and temperatureincreased the adsorption efficiency while it was opposite with the initial concentration. Langmuir isotherm model described equilibrium data better compared to Freundlich isotherm model. The removal of Mn2+ ions proceeded by ion-exchange and adsorption. Metal oxide decorated bentonite can effectively reduce Mn2+ ions in polluted waters.
Keywords—Adsorption, bentonite, manganese, metal oxide
Sep 26, 2017
How to Cite
MULIWA, Anthony; MAITY, A.; OCHIENG, A.. Treatment of manganese-containing mine water: adsorption onto metal oxide decorated bentonite. Proceedings of Sustainable Research and Innovation Conference, [S.l.], p. 13-16, sep. 2017. ISSN 2079-6226. Available at: <http://sri.jkuat.ac.ke/ojs/index.php/proceedings/article/view/599>. Date accessed: 24 feb. 2018.
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