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Issue 7, 2016
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Competitive removal of Cd(ii) and Pb(ii) by biochars produced from water hyacinths: performance and mechanism

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Abstract

Three biochars converted from water hyacinth biomass at 300, 450, and 600 °C were used to investigate the adsorption properties of Cd2+ and Pb2+. In addition, the competitive adsorption mechanisms between Cd2+ and Pb2+ were also conducted. Adsorption kinetics and isotherms indicated that the maximum adsorption capacity of Pb2+ was larger than that of Cd2+, and the adsorption process in the mixed solutions of two heavy metals (Cd2+ and Pb2+) was more favorable for Pb2+. Further investigation about the characterization of biochars demonstrated that cation exchange, surface complexation, cation–π interaction and precipitation were the main mechanisms responsible for the heavy metal removal. In this study, competitive adsorption may also be explained by these mechanisms. These results are useful for the application of biochars in selective adsorption and in practical wastewater treatment.

Graphical abstract: Competitive removal of Cd(ii) and Pb(ii) by biochars produced from water hyacinths: performance and mechanism

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Publication details

The article was received on 09 Dec 2015, accepted on 23 Dec 2015 and first published on 05 Jan 2016


Article type: Paper
DOI: 10.1039/C5RA26248H
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RSC Adv., 2016,6, 5223-5232

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    Competitive removal of Cd(II) and Pb(II) by biochars produced from water hyacinths: performance and mechanism

    Y. Ding, Y. Liu, S. Liu, Z. Li, X. Tan, X. Huang, G. Zeng, Y. Zhou, B. Zheng and X. Cai, RSC Adv., 2016, 6, 5223
    DOI: 10.1039/C5RA26248H

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