Reversible, Selective Trapping of Perchlorate from Water in Record Capacity by a Cationic Metal-Organic Framework

Environmental Science & Technology
Ian R ColinasScott R J Oliver

Abstract

We report the capture of ppm-level aqueous perchlorate in record capacity and kinetics via the complete anion exchange of a cationic metal-organic framework. Ambient conditions were used for both the synthesis of silver 4,4'-bipyridine nitrate (SBN) and the exchange, forming silver 4,4'-bipyridine perchlorate (SBP). The exchange was complete within 90 min, and the capacity was 354 mg/g, representing 99% removal. These values are greater than current anion exchangers such as the resins Amberlite IRA-400 (249 mg/g), Purolite A530E (104 mg/g), and layered double hydroxides (28 mg/g). Moreover, unlike resins and layered double hydroxides, SBN is fully reusable and displays 96% regeneration to SBN in nitrate solution, with new crystal formation allowing the indefinite cycling for perchlorate. We show seven cycles as proof of concept. Perchlorate contamination of water represents a serious health threat because it is a thyroid endocrine disruptor. This noncomplexing anionic pollutant is significantly mobile and environmentally persistent. Removal of other anionic pollutants from water such as chromate, pertechnetate, or arsenate may be possible by this methodology.

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Citations

Jun 17, 2016·Inorganic Chemistry·Zhuanling BaiShuao Wang
Feb 18, 2017·Environmental Science & Technology·Daopeng ShengShuao Wang
Apr 7, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Ian R ColinasScott R J Oliver
May 27, 2017·ACS Applied Materials & Interfaces·Xiaocheng LiuGuangming Zeng
Mar 28, 2018·Advanced Materials·Xiang ZhaoPingyun Feng
Dec 20, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Yadagiri RachuriEringathodi Suresh
Apr 6, 2019·Nature Communications·Lei MeiWei-Qun Shi
Feb 1, 2019·Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials·Mei Ming, Jun Shi
Nov 15, 2020·The Science of the Total Environment·Xiaolong YuYan Zheng
Jun 9, 2019·Environmental Science & Technology·Eaindar SoeScott R J Oliver
Oct 24, 2018·Journal of the American Chemical Society·Xiang ZhaoXianhui Bu
Oct 24, 2018·ACS Applied Materials & Interfaces·Aamod V DesaiSujit K Ghosh

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