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

A. M. Muliwa, A. Maity, Aoyi Ochieng

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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
Original languageEnglish
Title of host publicationProceedings of Sustainable Research and Innovation Conference
Pages13-16
ISBN (Electronic)2079-6226
Publication statusPublished - 2017
Event2017 Annual Sustainable Research and Innovation Conference -
Duration: May 3 2017May 5 2017

Conference

Conference2017 Annual Sustainable Research and Innovation Conference
Abbreviated titleSRI 2017
Period5/3/175/5/17

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Bentonite
Manganese
Oxides
Metals
Adsorption
Water
Ions
Isotherms
Water pollution
Poisons
Mineral industry
Adsorbents
Ion exchange
Impurities
Kinetics
Composite materials
Experiments

Cite this

Muliwa, A. M., Maity, A., & Ochieng, A. (2017). Treatment of manganese-containing mine water: Adsorption onto metal oxide decorated bentonite. In Proceedings of Sustainable Research and Innovation Conference (pp. 13-16)
Muliwa, A. M. ; Maity, A. ; Ochieng, Aoyi. / Treatment of manganese-containing mine water : Adsorption onto metal oxide decorated bentonite. Proceedings of Sustainable Research and Innovation Conference. 2017. pp. 13-16
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Muliwa, AM, Maity, A & Ochieng, A 2017, Treatment of manganese-containing mine water: Adsorption onto metal oxide decorated bentonite. in Proceedings of Sustainable Research and Innovation Conference. pp. 13-16, 2017 Annual Sustainable Research and Innovation Conference , 5/3/17.

Treatment of manganese-containing mine water : Adsorption onto metal oxide decorated bentonite. / Muliwa, A. M.; Maity, A.; Ochieng, Aoyi.

Proceedings of Sustainable Research and Innovation Conference. 2017. p. 13-16.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Treatment of manganese-containing mine water

T2 - Adsorption onto metal oxide decorated bentonite

AU - Muliwa, A. M.

AU - Maity, A.

AU - Ochieng, Aoyi

PY - 2017

Y1 - 2017

N2 - 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

AB - 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

M3 - Conference contribution

SP - 13

EP - 16

BT - Proceedings of Sustainable Research and Innovation Conference

ER -

Muliwa AM, Maity A, Ochieng A. Treatment of manganese-containing mine water: Adsorption onto metal oxide decorated bentonite. In Proceedings of Sustainable Research and Innovation Conference. 2017. p. 13-16