Treatment of manganese-containing mine water: adsorption onto metal oxide decorated bentonite

  • Anthony Muliwa Tshwane University of Technology
  • A. Maity Council for Scientific and Industrial Research
  • A. Ochieng Vaal University of Technology

Abstract

Water 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
Published
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: 18 aug. 2018.