Gu Xinyi, Jiang Linjiang, Zhou Zirui, Ling Caiyuan, Lu Dingtian, Zhong Kai, Zhang Chaolan
School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, People's Republic of China.
Key Laboratory of Environmental Protection (Guangxi University), Education Department of Guangxi Zhuang Autonomous Region, Nanning, 530004, Guangxi, People's Republic of China.
Environ Sci Pollut Res Int. 2024 May;31(25):37848-37861. doi: 10.1007/s11356-024-33747-3. Epub 2024 May 25.
Arsenic (As) is one extremely hazardous and carcinogenic metalloid element. Due to mining, metal smelting, and other human activities, the pollution of water (especially groundwater) and soil caused by As is increasingly serious, which badly threatens the environment and human health. In this study, a zeolite imidazolate framework (ZIF-8) was synthesized at room temperature and employed as an adsorbent to facilitate the adsorption of As(III) and As(V) from the solution. The successful synthesis of ZIF-8 was demonstrated by X-ray diffraction (XRD), and scanning electron microscopy (SEM) revealed that its particle size was approximately 80 nm. The adsorption kinetics, adsorption isotherm, solution pH, dose, coexisting ions, and the synonymous elements antimony (Sb) were conducted to study the adsorption of As by ZIF-8 nanoparticles. The maximum saturation adsorption capacity was determined to be 101.47 mg/g and 81.40 mg/g for As(III), and As(V) at initial pH = 7.0, respectively. Apparently, ZIF-8 had a good removal effect on As, and it still maintained a good performance after four cycles. The coexisting ions PO and CO inhibited the adsorption of both As(III) and As(V). ZIF-8 performed well in removing both As and Sb simultaneously, although the presence of Sb hindered the adsorption of both As(III) and As(V). Both FTIR and XPS indicated the adsorption mechanism of As on ZIF-8: ZIF-8 generates a large amount of Zn-OH on the surface through hydrolysis and partial fracture of Zn-N, both of which form surface complexes with As.
砷（As）是一种极具危害性的致癌类金属元素。由于采矿、金属冶炼及其他人类活动，砷对水（尤其是地下水）和土壤造成的污染日益严重，这对环境和人类健康构成了严重威胁。在本研究中，室温下合成了沸石咪唑酯骨架材料（ZIF-8），并将其用作吸附剂以促进从溶液中吸附As(III)和As(V)。通过X射线衍射（XRD）证明了ZIF-8的成功合成，扫描电子显微镜（SEM）显示其粒径约为80纳米。研究了ZIF-8纳米颗粒对砷的吸附动力学、吸附等温线、溶液pH值、剂量、共存离子以及同义元素锑（Sb）。在初始pH = 7.0时，As(III)和As(V)的最大饱和吸附容量分别确定为101.47 mg/g和81.40 mg/g。显然，ZIF-8对砷具有良好的去除效果，并且在四个循环后仍保持良好性能。共存离子PO和CO抑制了As(III)和As(V)的吸附。尽管Sb的存在阻碍了As(III)和As(V)的吸附，但ZIF-8在同时去除As和Sb方面表现良好。傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）均表明了As在ZIF-8上的吸附机制：ZIF-8通过Zn-N的水解和部分断裂在表面产生大量Zn-OH，二者均与As形成表面络合物。
