Investigation of chromate coordination on ferrihydrite by in situ ATR-FTIR spectroscopy and theoretical frequency calculations

Environmental Science & Technology
Chad P Johnston, Maria Chrysochoou

Abstract

Chromate mobility, reactivity, and bioavailability in soil environments are affected by adsorption reactions on iron oxide minerals, but the adsorption mechanisms remain controversial. In this study, we employed in situ attenuated total reflectance Fourier transform infrared spectroscopy and theoretical frequency calculations to characterize chromate adsorption on 2-line ferrihydrite. The effects of pH, aqueous chromate concentration, ionic strength, and deuterium exchange were investigated. Results suggest the formation of monodentate and bidentate surface complexes. It was determined that monodentate complexes are dominant at low surface coverage and pH ≥ 6.5 and that bidentate complexes form at high surface coverage and pH < 6. Deuterium exchange experiments indicated that the inner-sphere complexes are not protonated. Difference spectra revealed that monodentate complexes are particularly susceptible to ionic strength effects under acidic conditions.

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Citations

Jun 19, 2014·Journal of Hazardous Materials·Chad P Johnston, Maria Chrysochoou
Dec 3, 2014·Journal of Hazardous Materials·Dimitris DermatasLefki Sakellariou
Jan 28, 2016·Environmental Science & Technology·Xiaopeng HuangLizhi Zhang
Feb 13, 2016·Environmental Science & Technology·Yanli YangJingyang Liu
Jun 10, 2015·Journal of Colloid and Interface Science·Jinyu XieYinyue Tan
Jul 28, 2016·Journal of Hazardous Materials·Veronika VeselskáMichael Komárek
Mar 3, 2018·Geochemical Transactions·James D KubickiNefeli Bompoti
Jan 4, 2020·Environmental Science. Processes & Impacts·Zhenqing ShiHerbert E Allen
Sep 7, 2020·The Science of the Total Environment·Meiqing ShiYangjin Wei
Jun 6, 2021·The Science of the Total Environment·Na ChenLizhi Zhang
Dec 21, 2016·Environmental Science & Technology·Chao PanDaniel E Giammar
Sep 27, 2019·Environmental Science & Technology·Zezhen PanDaniel E Giammar
Feb 7, 2015·Environmental Science & Technology·Elizabeth B CerkezDaniel R Strongin
May 8, 2019·Environmental Science & Technology·Nefeli Maria BompotiMichael L Machesky

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