锌铁水滑石改性赤泥对水体磷去除性能及机理

张恒; 李瑶; 赵聪; 黄涛; 彭道平; 陈星

doi:10.13205/j.hjgc.202402007

锌铁水滑石改性赤泥对水体磷去除性能及机理

doi: 10.13205/j.hjgc.202402007

西南交通大学地球科学与环境工程学院, 成都 611756

基金项目:

国家自然科学基金(42277043)

详细信息

作者简介:
张恒(1998-),男,硕士,主要研究方向为固体废物处理与资源化。zhangheng199811@163.com

通讯作者:
彭道平(1985-),男,博士,副研究员,主要研究方向为固体废物处理与资源化。pdp0330@swjtu.edu.cn

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出版历程
- 收稿日期: 2022-12-10
- 网络出版日期: 2024-04-28

PHOSPHORUS REMOVAL PERFORMANCE AND MECHANISM IN WATER OF ZINC IRON HYDROTALCITE MODIFIED RED MUD

Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China

摘要

摘要: 为解决水体中的磷超标问题,采用碱性共沉淀法将锌铁水滑石(Zn/Fe-LDHs)负载于赤泥(RM)表面制得Zn/Fe-LDHs改性赤泥(ZFRM),用以去除水体中的磷。通过动力学实验、热力学实验、再生实验,并结合SEM、BET、XRD、FTIR表征手段研究Zn/Fe-LDHs改性赤泥对磷酸盐的去除性能及机理。实验结果表明:ZFRM对磷的吸附过程符合准二级动力学和Langmuir吸附等温模型,45℃下拟合可得磷酸盐最大吸附量可达56.26 mg/g,吸附反应为自发、熵增的吸热反应。ZFRM的除磷能力受pH影响较小。溶液中共存的CO₃^2-对磷的吸附有明显的抑制作用。再生实验中,ZFRM经过4次再生后吸附量为19.07 mg/g,仍具有良好的吸附性能。此外,层片状的锌铁水滑石已成功覆着于絮状赤泥表面,形成发达的孔隙结构,比表面积大幅提高。吸附机理主要包括离子交换、配位反应、静电作用。与其他除磷材料相比,合成的ZFRM除磷效率高,可再生性强,原料价廉易得,合成方法简单,是具有应用潜力的高效除磷剂。
- 赤泥 /
- Zn/Fe-LDHs /
- 磷酸盐 /
- 吸附 /
- 水滑石
Abstract: To solve the problem of excessive phosphorus in water, Zn/Fe-LDHs modified red mud(ZFRM) was prepared by coprecipitating Zn/Fe-LDHs onto the surface of red mud(RM) under alkaline conditions, and used to remove phosphate from wastewater. The phosphate removal performance and mechanism of Zn/Fe-LDHs modified red mud were studied by kinetic experiments, thermodynamic experiments, and regeneration experiments, combined with SEM, BET, XRD, and FTIR characterization. The results showed that the adsorption process of ZFRM to phosphorus conformed to the quasi-second-order kinetic model and Langmuir adsorption isotherm model. At 45 ℃, the maximum adsorption capacity was 56.26 mg/g, and the adsorption reaction was spontaneous and entropy-increasing endothermic reaction. The phosphorus removal capacity of ZFRM was less affected by pH. Carbonate ions coexisting in water can inhibit phosphorus adsorption. In the regeneration experiment, the adsorption capacity of ZFRM after 4 regenerations was 19.07 mg/g, and still had good adsorption performance. In addition, lamellar zinc iron hydrotalcite had been successfully coated on the surface of the flocculent red mud, forming a developed pore structure, and significantly increasing the specific surface area. The adsorption mechanism mainly included ion exchange, coordination reaction, and electrostatic action. Compared with other phosphorus removal materials, the synthesized ZFRM had high phosphorus removal efficiency, strong reproducibility, cheap raw materials, and simple synthesis process. It was a highly effective phosphorus removal agent with great potential in application.
- red mud /
- Zn/Fe-LDHs /
- phosphate /
- adsorption /
- hydrotalcite

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