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Updated: Jun 5, 2025

Development and Validation of Chromium Getters for Solid Oxide Fuel Cell Power Systems
Published on: May 26, 2019
Freezing-driven reduction of chromium(Ⅵ) in ice under solar light without external reductants
Shuyi Yu1, Yufei Qin1, Yubo Zhong1
1Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China; Jilin Provincial Key Laboratory of Water Resources and Water Environment, Jilin University, Changchun 130021, China.
Abstract:
This study systematically investigated the direct photoreduction of Cr(Ⅵ) in ice under simulated sunlight without external reductants. It was shown that the Cr(Ⅵ) photoreduction was observed only in ice at near-neutral pH values but not in aqueous solutions. Cr(Ⅵ) at an initial concentration of 10 μM was efficiently reduced by 75.8 % in ice after 180 min of illumination (λ > 290 nm). Low-temperature EPR spectra revealed the formation of the final product Cr(Ⅲ) and the intermediates Cr(Ⅳ) and Cr(Ⅴ). Based on UV-vis absorption spectra, Raman spectra, EPR spectra, and the DFT calculation, the mechanism of structural catalysis of the ice surface was proposed. Various dissolved organic matters significantly promoted the Cr(Ⅵ) photoreduction in ice under sunlight; the outdoor experiment confirmed the feasibility of the process occurring in the natural environment. This research revealed a new transformation pathway for Cr(Ⅵ) in cold regions.
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