Ca(2+) -Induced Oxygen Generation by FeO4(2-) at pH 9-10

Angewandte Chemie
Li MaTai-Chu Lau

Abstract

Although FeO4(2-) (ferrate(IV)) is a very strong oxidant that readily oxidizes water in acidic medium, at pH 9-10 it is relatively stable (<2 % decomposition after 1 h at 298 K). However, FeO4(2-) is readily activated by Ca(2+) at pH 9-10 to generate O2. The reaction has the following rate law: d[O2]/dt=kCa [Ca(2+) ][FeO4(2-)](2). (18)O-labeling experiments show that both O atoms in O2 come from FeO4(2-). These results together with DFT calculations suggest that the function of Ca(2+) is to facilitate O-O coupling between two FeO4 (2-) ions by bridging them together. Similar activating effects are also observed with Mg(2+) and Sr(2+).

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Citations

Nov 30, 2018·Physical Chemistry Chemical Physics : PCCP·Petr NovakRadek Zboril
Dec 12, 2018·Ecotoxicology and Environmental Safety·Hongxia LiuZunyao Wang
Jan 21, 2020·Nano-micro Letters·Ying ZhouTao Li
Aug 14, 2020·Journal of the American Chemical Society·Shan-Shan XueWonwoo Nam
Dec 17, 2020·Environmental Science & Technology·Xianbing ZhangVirender K Sharma
Sep 7, 2018·Environmental Science & Technology·Mingbao FengVirender K Sharma
Feb 2, 2019·Journal of the American Chemical Society·Yingying Liu, Tai-Chu Lau
Nov 24, 2021·Inorganic Chemistry·Geetika GuptaSayantan Paria
Dec 18, 2021·Environmental Science & Technology·Virender K SharmaChing-Hua Huang

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