功能化共价有机框架材料对水体中汞离子的吸附性能研究

doi:10.19741/j.issn.1673-4831.2022.0736

摘要/Abstract

摘要： 引入氨基和巯基等官能团对共价有机框架材料(COFs)表面进行设计,制备功能化COFs材料并应用于水体中的汞离子吸附,采用傅里叶红外光谱仪(FT-IR)、X射线粉末衍射仪(XRD)和扫描电子显微镜(SEM)等仪器对材料表面结构进行表征;使用原子荧光光度计测定吸附后水体中汞离子浓度,并采用吸附等温线和动力学模型对试验数据进行拟合,探究该材料在不同条件下的吸附性能。实验结果表明:在初始浓度为600 mg·L^-1时,吸附量达到最大值587.6 mg·g^-1;在吸附时间为1 min时可到达平衡状态;在pH值为1~10时,吸附率在95%以上;在多种重金属离子共存的水体中,COFs材料对水体中汞离子的吸附率可达到66%。吸附过程遵循准二级动力学模型和Langmuir吸附等温线,主要表现为容易进行的化学吸附。因此,COFs材料在吸附和分离水环境中的多种金属离子方面具有良好的发展潜力。

关键词: 共价有机框架材料, 汞离子, 水环境, 吸附性能

Abstract: In this study, amino and mercapto functional groups were introduced to design the surface of covalent organic framework materials (COFs), and COFs were prepared and applied to adsorb mercury ions in water. It was characterized by X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscope, respectively. The concentration of mercury ions in aqueous solution after adsorption with COFs was measured by atomic fluorescence spectrometer, the experimental data were fitted by adsorption isotherm and kinetic model to explore the adsorption performance of the material under different conditions. According to the data, when the mercury ion concentration was 600 mg·L^-1, the adsorption amount reached the maximum of 587.6 mg·g^-1. The adsorption rate remains above 95% in the range of pH 1-10. The reaction can reach the adsorption equilibrium state within 1 min. In the solution with multiple ions coexisting, the adsorption rate of mercury ions can still reach to 66%. The study of adsorption process proved that the adsorption fit the pseudo-second-order kinetic model and Langmuir adsorption isotherm. It is a kind of easy reaction chemical adsorption. Therefore, COFs materials have good development potential in the field of adsorption and separation of heavy metal ions from water environment.

Key words: covalent organic framework materials, mercury ions, water environment, adsorption properties

中图分类号:

X703

陆素芬, 张高荣, 伍丽娟, 杨美凤, 陆俊宇. 功能化共价有机框架材料对水体中汞离子的吸附性能研究[J]. 生态与农村环境学报, 2023, 39(8): 1059-1066.

LU Su-fen, ZHANG Gao-rong, WU Li-juan, YANG Mei-feng, LU Jun-yu. Adsorption Properties of Functional Covalent Organic Framework Materials for Mercury Ions in Water[J]. Journal of Ecology and Rural Environment, 2023, 39(8): 1059-1066.

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