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1. Overlooked Role of Chromium(V) and Chromium(IV) in Chromium Redox Reactions of Environmental Importance

   https://doi.org/10.1021/acsestwater.1c00409  

   Bell, Joshua ; Ma, Xingmao ; McDonald, Thomas J. ; Huang, Ching-Hua ; Sharma, Virender K. ( June 2022 , ACS ES&T Water)
2. Kinetics of chromium(V)-oxo and chromium(IV)-oxo porphyrins: Reactivity and mechanism for sulfoxidation reactions

   https://doi.org/10.1016/j.jinorgbio.2022.112006  

   Skipworth, Tristan ; Khashimov, Mardan ; Ojo, Iyanu ; Zhang, Rui ( December 2022 , Journal of Inorganic Biochemistry)
3. Kinetics of chromium(V)-oxo and chromium(IV)-oxo porphyrins: Reactivity and mechanism for sulfoxidation reactions

   Skipworth, Tristan ; Khashimov, Mardan ; Ojo, Iyanu ; Zhang, Rui ( September 2022 , Journal of inorganic biochemistry)
4. Effect of ferrous sulfate dosage and soil particle size on leachability and species distribution of chromium in hexavalent chromium‐contaminated soil stabilized by ferrous sulfate

   https://doi.org/10.1002/ep.12936  

   Zhang, Ting‐Ting ; Xue, Qiang ; Li, Jiang‐Shan ; Wei, Ming‐Li ; Wang, Ping ; Liu, Lei‐ ; Wan, Yong ( November 2018 , Environmental Progress & Sustainable Energy)

   Ferrous sulfate (FeSO₄) is widely used to effectively stabilize hexavalent chromium (Cr(VI))‐contaminated soil. The leaching behavior, Cr(VI) content, and chromium speciation distribution in the stabilized soil are the most important indexes for determining the effectiveness of reduction treatment. Numerous factors, such as reductant dosage and soil particle size, affect the stabilization process; these factors are relatively important. This study investigated the influence of FeSO₄dosage and soil particle size on leachability and speciation distribution of chromium in contaminated soil. Results showed that the increase in FeSO₄significantly reduced the leachability and Cr(VI) content in the soil given the increased reducible species that stem from an acid soluble fraction of chromium. The small particle size of the soil that contains a large surface area facilitated the reaction between Cr(VI) and FeSO₄, thereby resulting in low leachability and high reducible species of Cr(VI) in the stabilized soil. The leached Cr(VI) concentration was exponentially correlated to Cr(VI) content in the stabilized soil, and the leachability of Cr from the stabilized soil was linearly correlated to the exchangeable phase of Cr. In addition, the leached Cr(VI) concentration from the stabilized soil conform to the US Environmental Protection Agency and China regulatory limits; meanwhile, considerable Cr(VI) remained in a few stabilized soil and exceeded the environmental quality standards for soil in China. These results illustrated the importance of a comprehensive assessment of Cr(VI)‐contaminated soil, which is treated by reductants for enabling flexible future land use. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 500–507, 2019

    

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5. Microbial reduction of metal-organic frameworks enables synergistic chromium removal

   https://doi.org/10.1038/s41467-019-13219-w  

   Springthorpe, Sarah K. ; Dundas, Christopher M. ; Keitz, Benjamin K. ( December 2019 , Nature Communications)

   Redox interactions between electroactive bacteria and inorganic materials underpin many emerging technologies, but commonly used materials (e.g., metal oxides) suffer from limited tunability and can be challenging to characterize. In contrast, metal-organic frameworks exhibit well-defined structures, large surface areas, and extensive chemical tunability, but their utility as microbial substrates has not been examined. Here, we report that metal-organic frameworks can support the growth of the metal-respiring bacteriumShewanella oneidensis, specifically through the reduction of Fe(III). In a practical application, we show that cultures containingS. oneidensisand reduced metal-organic frameworks can remediate lethal concentrations of Cr(VI) over multiple cycles, and that pollutant removal exceeds the performance of either component in isolation or bio-reduced iron oxides. Our results demonstrate that frameworks can serve as growth substrates and suggest that they may offer an alternative to metal oxides in applications seeking to combine the advantages of bacterial metabolism and synthetic materials.

    

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