Abstract:Metal-organic framework materials MIL-100(Fe) and MIL-100(Fe)-DMA were prepared by hydrothermal and solvothermal methods. The structures of materials were characterized by FTIR, XRD, SEM, XPS and N2 adsorption/desorption. The effects of initial Sr2+ concentration, adsorption time, pH value of solution and different co-existing cations on the adsorption performance of the materials were investigated by static adsorption experiments; The adsorption kinetics and adsorption isotherms models of Sr2+ adsorption on the two materials were studied. The results showed that the basic framework of the two materials was consistent, and the effect of adsorbed Sr2+ on the material framework can be ignored. Although the specific surface area of MIL-100(Fe)-DMA was smaller than that of MIL-100(Fe), the mesoporous structure formed by accumulation was more conducive to the diffusion of Sr2+ due to the small grain size. The results of adsorption experiments showed that: with the increase of the reaction time and the initial Sr2+ concentration, the adsorption capacity of the two materials for Sr2+ increased rapidly and then gradually reached equilibrium. With the increase of pH value, the adsorption amount of Sr2+ by the two materials increased, and the adsorption effect was better under alkaline condition. The adsorption process of both materials conformed to the quasi-second-order kinetic model, Weber-Morris models and the Langmuir adsorption isothermal model. The adsorption of Sr2+ by MIL-100(Fe) materials can be improved by using trivalent iron salt as iron source and DMA as organic solvent.
张琪欣, 姚初清, 徐天寒, 柴凡超, 王国辉, 戴耀东. 新型MIL-100(Fe)基MOFs材料的制备及其对Sr2+的吸附[J]. 中国环境科学, 2021, 41(1): 141-150.
ZHANG Qi-Xin, YAO Chu-Qing, XU Tian-Han, CHAI Fan-Chao, WANG Guo-Hui, DAI Yao-Dong. Novel MIL-100(Fe) based MOFs materials and their adsorption on Sr2+. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 141-150.
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