Removal of Cs+ from water and soil by ammonium-pillared montmorillonite/Fe3O4 composite

查看全文 作　　者：Xianming [1]Zheng;Junfeng [1]Dou;Jing [1]Yuan;Wei [1]Qin;Xiaoxi [1]Hong;Aizhong [1]Ding

机构地区：[1]College of Water Sciences,Beijing Normal University

出　　处：《Journal of Environmental Sciences》索引2017年第29卷第6期,共13页

基　　金：supported by the Special Scientific Research Fund of Public Welfare Profession (Environmental Protection) of China (no.201509074) 摘　　要：To remove cesium ions from water and soil, a novel adsorbent was synthesized by following a one-step co-precipitation method and using non-toxic raw materials. By combining ammonium-pillared montmorillonite(MMT) and magnetic nanoparticles(Fe_3O_4), an MMT/Fe_3O_4 composite was prepared and characterized. The adsorbent exhibited high selectivity of Cs^+ and could be rapidly separated from the mixed solution under an external magnetic field. Above all, the adsorbent had high removal efficiency in cesium-contaminated samples(water and soil) and also showed good recycling performance, indicating that the MMT/Fe_3O_4 composite could be widely applied to the remediation of cesium-contaminated environments. It was observed that the pH, solid/liquid ratio and initial concentration affected adsorption capacity. In the presence of coexisting ions, the adsorption capacity decreased in the order of Ca^(2+)> Mg^(2+)> K^+> Na^+, which is consistent with our theoretical prediction. The adsorption behavior of this new adsorbent could be expressed by the pseudo-second-order model and Freundlich isotherm. In addition, the adsorption mechanism of Cs^+ was NH_4^+ ion exchange and surface hydroxyl group coordination, with the former being more predominant. 关键词：四氧化三铁铵离子交换除水土壤复合物蒙脱石 CS 磁性纳米粒子

相关文献

参考文献（39）
引证文献（13）
耦合文献（0）

参考文献(39)

引证文献(13)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Removal of Cs+ from water and soil by ammonium-pillared montmorillonite/Fe3O4 composite

参考文献(39)

引证文献(13)

用户提示