期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 9, 期 6, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.106865
关键词
Biochar; Halloysite; Magnetic adsorbents; Ball mill; Pb(II)
Halloysite/biochar and magnetic adsorbents were prepared through co-pyrolysis and ball-mill extrusion for the adsorption of Pb(II) from water. The magnetic adsorbents showed high removal efficiency and maintained above 90% after multiple cycles, indicating potential application in wastewater treatment. Various mechanisms such as complexation, cation exchange, and electrostatic adsorption were proposed for Pb(II) removal.
Halloysite/biochar was prepared by co-pyrolysis at different temperatures using coconut shell and halloysite as raw materials. Magnetic adsorbents were prepared through ball-mill extrusion with Fe3O4 and the halloysite/biochar and the capacity of the adsorbents to adsorb Pb(II) from water was evaluated and compared. The effects of pH, contact time, and initial Pb(II) concentration on the adsorption capacity of the magnetic adsorbents for Pb (II) were investigated. The pseudo-second-order (R-2=0.9999) and Langmuir isothermal models (R-2=0.9906) fit the experimental data well. The prepared samples denotes as MBM-HBC700 exhibited the highest Pb(II) adsorption capacity (833.33 + 16.71 mg.g(-1)), and the removal efficiency of Pb(II) by the magnetic adsorbents was above 90% after four adsorption-desorption cycles. Complexation, cation exchange, cation-pi interaction, precipitation, pore filling and electrostatic adsorption have been proposed as the main removal mechanisms. After applying MBM-HBCs to simulated electroplating wastewater, the contents of Pb(II), Cu(II), Zn(II), and Cr (VI) were significantly lower than the discharge standard of China. The magnetic adsorbents prepared in this study have wide application prospects in the treatment of Pb(II) in wastewater, thus providing a new approach for promoting waste recycling and utilization.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据