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Comparative sorption isotherms and removal studies for Pb(II) by physical and thermochemical modification of low-cost agro-wastes from Tanzania

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dc.contributor.author Rwiza, Mwemezi Johaiven
dc.contributor.author Oh, Seok-Young
dc.contributor.author Kim, Kyoung-Woong
dc.contributor.author Kim, Sang Don
dc.date.accessioned 2019-06-11T07:38:29Z
dc.date.available 2019-06-11T07:38:29Z
dc.date.issued 2018-03
dc.identifier.uri https://doi.org/10.1016/j.chemosphere.2017.12.043
dc.identifier.uri http://dspace.nm-aist.ac.tz/handle/123456789/321
dc.description Research Article published by Elsevier Volume 195, March 2018 en_US
dc.description.abstract Corn and rice husks, agro-wastes available in large quantities in Tanzania, were used to remove Pb2+ from aqueous solution. Husks were used in raw form, pyrolyzed form, and chemically modified form. Material characterization was carried out using the BET method, FTIR spectroscopy, SEM, pHPZC, and cation exchange capacity analysis. Langmuir, Freundlich, Dubinin-Radushkevich (D-R), and Temkin isotherms were used to elucidate Pb2+ sorption mechanisms. The surface area and cation exchange capacity (CEC) of untreated and chemically treated biochars were significantly higher than that of raw husks. Sorption data for Pb2+ for all biosorbents fit the Freundlich and D-R models well with high R2 values. Most of the synthesized biosorbents in this study indicated >90% for Pb2+ removal, with the ZnCl2-treated corn husk biochar sorption capacities ranking highest in all modeling results. Surface morphological features (e.g., micropores and fissures) and acidic and unsaturated functional groups may have significantly contributed to the observed Pb2+ removal efficiencies. en_US
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.subject Agro-wastes en_US
dc.title Comparative sorption isotherms and removal studies for Pb(II) by physical and thermochemical modification of low-cost agro-wastes from Tanzania en_US
dc.type Article en_US


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