太阳光下冰中铬(Ⅵ)的冷冻驱动还原，无需外加还原剂

IF 12.2 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Journal of Hazardous Materials Pub Date : 2024-12-13 DOI:10.1016/j.jhazmat.2024.136798

Shuyi Yu, Yufei Qin, Yubo Zhong, Nan Wang, Xiaolei Xu, Chunli Kang

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Freezing-driven reduction of chromium(Ⅵ) in ice under solar light without external reductants

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Freezing-driven reduction of chromium(Ⅵ) in ice under solar light without external reductants

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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来源期刊

Journal of Hazardous Materials 工程技术-工程：环境

CiteScore

25.40

自引率

5.90%

发文量

3059

审稿时长

58 days

期刊介绍： The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.