Removal of antimonite and antimonate from water using Fe-based metal-organic frameworks: The relationship between framework structure and adsorption performance  被引量:8

Removal of antimonite and antimonate from water using Fe-based metal-organic frameworks: The relationship between framework structure and adsorption performance

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作  者:Wei Zhang Na Li Ting Xiao Wenting Tang Guangli Xiu 

机构地区:[1]State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process,School of Resources and Environmental Engineering,East China University of Science and Technology,Shanghai 200237,China [2]Shanghai Institute of Pollution Control and Ecological Security,Tongji University,Shanghai 200092,China [3]Shanghai Environmental Protection Key Laboratory on Environmental Standard and Risk Management of Chemical Pollutants,East China,University of Science and Technology,Shanghai 200237,China

出  处:《Journal of Environmental Sciences》2019年第12期213-224,共12页环境科学学报(英文版)

基  金:supported by the National Natural Science Foundation of China (No. 41201302);the Natural Science Foundation of Shanghai (No. 17ZR1407000);the Fundamental Research Funds for the Central Universities (No. 222201514337)

摘  要:We investigated the adsorption performance of five Fe-based MOFs(Fe-BTC,MIL-100(Fe),MIL-101(Fe),MIL-53(Fe)and MIL-88 C(Fe))for removal of antimonite(Sb(Ⅲ))and antimonate(Sb(Ⅴ))from water.Among these MOFs,MIL-101(Fe)exhibited the best adsorption capacities for both Sb(Ⅲ)and Sb(Ⅴ)(151.8 and 472.8 mg/g,respectively)which were higher than those of most adsorbents previously reported.The effect of steric hindrance was evident during Sb removal using the Fe-based MOFs,and the proper diameter of the smallest cage windows/channels should be considered an important parameter during the evaluation and selection of MOFs.Additionally,the adsorption capacities of MIL-101(Fe)for Sb(Ⅴ)decreased with increasing initial p H values(from 3.0 to 8.0),while the opposite trend was observed for Sb(Ⅲ).Chloride,nitrate and sulfate ions had a negligible influence on Sb(Ⅴ)adsorption,while NO3-and SO42-improved Sb(Ⅲ)adsorption.This result implies that inner sphere complexes might form during both Sb(Ⅲ)and Sb(Ⅴ)adsorption.We investigated the adsorption performance of five Fe-based MOFs(Fe-BTC, MIL-100(Fe),MIL-101(Fe), MIL-53(Fe) and MIL-88 C(Fe)) for removal of antimonite(Sb(Ⅲ)) and antimonate(Sb(Ⅴ)) from water. Among these MOFs, MIL-101(Fe) exhibited the best adsorption capacities for both Sb(Ⅲ) and Sb(Ⅴ)(151.8 and 472.8 mg/g, respectively) which were higher than those of most adsorbents previously reported. The effect of steric hindrance was evident during Sb removal using the Fe-based MOFs, and the proper diameter of the smallest cage windows/channels should be considered an important parameter during the evaluation and selection of MOFs. Additionally, the adsorption capacities of MIL-101(Fe) for Sb(Ⅴ)decreased with increasing initial p H values(from 3.0 to 8.0), while the opposite trend was observed for Sb(Ⅲ). Chloride, nitrate and sulfate ions had a negligible influence on Sb(Ⅴ)adsorption, while NO3- and SO42- improved Sb(Ⅲ) adsorption. This result implies that inner sphere complexes might form during both Sb(Ⅲ) and Sb(Ⅴ) adsorption.

关 键 词:Metal organic frameworks MIL-101(Fe) ANTIMONITE ANTIMONATE Cage windows Steric hindrance 

分 类 号:O64[理学—物理化学]

 

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