Competitive adsorption of Pb(II), Cu(II), and Zn(II) ions onto hydroxyapatite-biochar nanocomposite in aqueous solutions

文献类型： 外文期刊

第一作者： Wang, Yu-Ying

作者： Wang, Yu-Ying;Liu, Yu-Xue;Lu, Hao-Hao;Yang, Sheng-Mao;Wang, Yu-Ying;Liu, Yu-Xue;Lu, Hao-Hao;Yang, Sheng-Mao;Yang, Rui-Qin;Yang, Rui-Qin

作者机构：

关键词： Biochar; Hydroxyapatite; Nanocomposite; Competitive adsorption; Heavy metal

期刊名称：JOURNAL OF SOLID STATE CHEMISTRY （ 影响因子：3.498； 五年影响因子：2.831 ）

ISSN： 0022-4596

年卷期： 2018 年 261 卷

页码：

收录情况： SCI

摘要： A hydroxyapatite-biochar nanocomposite (HAP-BC) was successfully fabricated and its physicochemical properties characterized. The analyses showed that HAP nanoparticles were successfully loaded on the biochar surface. The adsorption of Pb(II), Cu(II), and Zn(II) by HAP-BC was systematically studied in single and ternary metal systems. The results demonstrated that pH affects the adsorption of heavy metals onto HAP-BC. Regarding the adsorption kinetics, the pseudo-second-order model showed the best fit for all three heavy metal ions on HAP-BC. In both single and ternary metal ion systems, the adsorption isotherm of Pb(II) by HAP-BC followed Langmuir model, while those of Cu(II) and Zn(II) fitted well with Freundlich model. The maximum adsorption capacity for each tested metal by HAP-BC was higher than that of pristine rice straw biochar (especially for Pb(II)) or those of other reported adsorbents. Therefore, HAP-BC could explore as a new material for future application in heavy metal removal.

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