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

Wei Zhang; Na Li; Ting Xiao; Wenting Tang; Guangli Xiu

doi:10.1016/j.jes.2019.06.001

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

J Environ Sci (China). 2019 Dec:86:213-224. doi: 10.1016/j.jes.2019.06.001. Epub 2019 Jun 12.

Authors

Wei Zhang¹, Na Li², Ting Xiao², Wenting Tang², Guangli Xiu²

Affiliations

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; Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai 200092, China; Shanghai Environmental Protection Key Laboratory on Environmental Standard and Risk Management of Chemical Pollutants, East China University of Science and Technology, Shanghai 200237, China. Electronic address: zhangwei@ecust.edu.cn.
² 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; Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai 200092, China; Shanghai Environmental Protection Key Laboratory on Environmental Standard and Risk Management of Chemical Pollutants, East China University of Science and Technology, Shanghai 200237, China.

PMID: 31787186
DOI: 10.1016/j.jes.2019.06.001

Abstract

We investigated the adsorption performance of five Fe-based MOFs (Fe-BTC, MIL-100(Fe), MIL-101(Fe), MIL-53(Fe) and MIL-88C(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 472.8mg/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 pH 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 SO₄^2- improved Sb(III) adsorption. This result implies that inner sphere complexes might form during both Sb(III) and Sb(V) adsorption.

Keywords: Antimonate; Antimonite; Cage windows; MIL-101(Fe); Metal organic frameworks; Steric hindrance.

MeSH terms

Adsorption
Antimony / chemistry*
Iron / chemistry*
Metal-Organic Frameworks / chemistry*
Water Pollutants, Chemical / chemistry*
Water Purification / methods*

Substances

MIL-101
Metal-Organic Frameworks
Water Pollutants, Chemical
antimonite
Antimony
Iron