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Removal of Cadmium (II) using water hyacinth (Eichhornia crassipes) biochar alginate beads in aqueous solutions

文献类型： 外文期刊

作者： Liu, Cenwei 1 ; Ye, Jing 1 ; Lin, Yi 1 ; Wu, Jian 1 ; Price, G. W. 3 ; Burton, D. 4 ; Wang, Yixiang 1 ;

作者机构： 1.Fujian Acad Agr Sci, Agr Ecol Inst, Fuzhou 350003, Fujian, Peoples R China

2.Fujian Key Lab Agr Ecol Proc Red Soil Hilly Reg, Fuzhou 350003, Fujian, Peoples R China

3.Dalhousie Univ, Dept Engn, Truro, NS B2N 5E3, Canada

4.Dalhousie Univ, Dept Plant Food & Environm Sci, Truro, NS B2N 5E3, Canada

关键词： Water hyacinths; Biochar-alginate capsule; Heavy metals; Langmuir and freundlich isotherms; Isotherms

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2020 年 264 卷

页码：

收录情况： SCI

摘要： Biochar produced from water hyacinths (Eichhornia crassipes) has been demonstrated to be an effective adsorbent for the removal of certain heavy metals and as a means of control for this highly invasive species. This study involved examined the Cd2+ sorption dynamics of an alginate encapsulated water hyacinth biochar (BAC) generated at different temperatures and modified using ferric/ferrous sulfate (MBAC). The maximum Cd2+ sorption occurred at a pH of 6 and at a solution temperature of 37 degrees C. Sorption equilibria for the biochar-alginate capsule (BAC) and modified biochar-alginate capsule (MBAC) treatments fit both the Langmuir (R-2 = 0.876 to 0.99) and Freundlich (R-2 = 0.849 to 0.971) equations. Langmuir isotherms had a better fit than the Freundlich isotherms, with maximum sorption capacities ranging from 24.2 to 45.8 mg Cd2+ g(-1). Larger K-L values in Freundlich modeling suggest strong bonding of the BAC and MBAC sorbents to Cd2+, with values of K-L in the MBAC treatments ranging between 31 and 178% greater than the BAC treatments. Cd2+ sorption followed pseudo first-order kinetics (R-2 = 0.926 to 0.991) with greater efficiency of removal using treatments with biochar generated at temperatures >500 degrees C. Results from this study highlight the potential for biochar-alginate capsules derived from water hyacinth to be effective for the removal of Cd2+ from wastewaters. (C) 2020 Elsevier Ltd. All rights reserved.

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