Preparation of montmorillonite modified biochar with various temperatures and their mechanism for Zn ion removal

生物炭 蒙脱石 吸附 热解 化学 化学工程 X射线光电子能谱 离子交换 无机化学 热液循环 水溶液 傅里叶变换红外光谱 材料科学 离子 弗伦德利希方程 有机化学 工程类
作者
Jingpeng Song,Shuaishuai Zhang,Guixiang Li,Qing Du,Fan Yang
出处
期刊:Journal of Hazardous Materials [Elsevier BV]
卷期号:391: 121692-121692 被引量:183
标识
DOI:10.1016/j.jhazmat.2019.121692
摘要

Because of its layered structure, excellent adsorption, catalytic and ion exchange properties, strong passivation, and superior adsorption capacity for heavy metals, montmorillonite as biochar modifier was introduced. Montmorillonite modified biochar composites (BC-MNT) were successfully prepared by one-step hydrothermal progress and subsequent pyrolysis for the application of Zn (II) removal from aqueous solution. Herein, our research mainly explored the effect of different hydrothermal method/pyrolysis temperatures on the adsorption properties of montmorillonite-biochar composites, since that temperature can greatly change the surface functional groups and chemical composition and structure of biochar. Primarily, adopting VK analysis method analyzed raw biochar and montmorillonite modified biochar at different temperature condition. For further research, adsorption mechanism was realized by means of SEM-EDS, XRD, FTIR, and XPS, as concluded that electrostatic interaction between the negative charge of the interlayers and Zn (II) and surface complexation took up a dominant role. The kinetic and isothermal adsorption mathematical model fitting were also performed, which was more suitable for pseudo-second order and Freundlich model, suggesting that the limited speed stage was dominated by chemical forces. The optimal preparation temperature (350 °C) and maximum adsorption amount (8.163 mg·g-1) were determined by the adsorption experiment model.
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