聚吡咯改性生物炭对氟的吸附特性研究

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摘要以聚吡咯(PPy)改性芦苇-底泥生物炭(LB)制备了一种特异性吸附阴离子的吸附剂材料(LB/PPy)并实现水体中氟离子的高效去除.通过扫描电镜(SEM)、X射线光电子能谱(XPS)、孔径分析仪(BET)和傅里叶红外光谱(FTIR)对LB/PPy材料进行结构表征,并通过批量吸附实验探究LB/PPy对氟离子的吸附动力学和关键影响因素,最终揭示了该材料对氟离子的特异性吸附机理.PPy增加了LB材料的比表面积及表面官能团丰度,赋予其较高的吸附容量及特异性吸附阴离子性能.LB/PPy对氟离子的吸附动力学过程均符合准二级动力学模型,吸附过程同时存在物理吸附和化学吸附作用,但主要以化学键合为主;40℃时,达到最大吸附容量,为45.34mg/g,温度增加,吸附容量提升.该材料去除氟离子的最适pH值范围为8~10,具有高效的吸附效果,在多离子混合存在下仍能够保证对氟离子良好的特异性吸附能力,具有极高的应用价值.

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	李卫平

关键词 ：生物炭, 聚吡咯改性, 氟离子, 吸附机理

Abstract：An adsorbent material (LB/PPy) with specific adsorption of anions was prepared by modifying reed-bottom biochar (LB) with polypyrrole (PPy) and achieving efficient removal of fluoride ions from water bodies. The LB/PPy material was structurally characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), pore size analyzer (BET), and Fourier infrared spectroscopy (FTIR), and the adsorption kinetics and key influencing factors of LB/PPy on fluoride ions were investigated by batch adsorption experiments, which revealed the specific adsorption mechanism of the material on fluoride ions. PPy increased the adsorption kinetics of LB/PPy on fluoride ions by the quasi-secondary kinetic model, the adsorption process has both physical and chemical adsorption, but mainly chemical bonding. The maximum adsorption capacity was 45.34mg/g at 40℃. The adsorption capacity increased with the increasing temperature. The optimum pH value of this material was from 8 to 10 to remove fluoride ions. It could ensure the good specific adsorption capacity of fluoride ions in the presence of multiple ions, which has a high application value.

Key words： biochar polypyrrole modification fluoride ion the adsorption mechanism

收稿日期: 2022-06-27

PACS:

X703.5

基金资助:国家自然科学基金资助项目(42167018);国家重点研发计划项目(2019YFC0409204);内蒙古自治区科技计划项目(2020GG0208)

通讯作者: 李卫平,教授,sjlwp@163.com E-mail: sjlwp@163.com

作者简介: 杨文焕(1980-),女,内蒙古包头市,内蒙古科技大学能源与环境学院副教授,主要从事河湖生态修复治理.发表论文20余篇.

引用本文:

杨文焕, 徐岩, 邓子威, 周鑫, 白妙馨, 李卫平. 聚吡咯改性生物炭对氟的吸附特性研究[J]. 中国环境科学, 2023, 43(2): 592-600. YANG Wen-huan, XU Yan, DENG Zi-wei, ZHOU Xin, BAI Miao-xin, LI Wei-ping. Study on the adsorption characteristics of polypyrrole-modified biochar to fluorine. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(2): 592-600.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I2/592

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