Selective photocatalytic reduction of selenate over TiO2 in the presence of nitrate and sulfate in mine-impacted water
| Autor: | Aldrich Ngan, Jane Ye, Frank X. Gu, Andrew B. Holmes |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
chemistry.chemical_classification
Environmental Engineering Health Toxicology and Mutagenesis Public Health Environmental and Occupational Health chemistry.chemical_element General Medicine General Chemistry Pollution Selenate Industrial wastewater treatment chemistry.chemical_compound chemistry Nitrate Environmental chemistry Hydrogen selenide Environmental Chemistry Carbonate Organic matter Sulfate Selenium |
| Zdroj: | Chemosphere. 287:131951 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2021.131951 |
| Popis: | Selenium contamination is a critical global issue across numerous industries. Industrial waters such as mine-impacted water (MIW) can contain toxic levels of selenate, in addition to varying concentrations of many different dissolved species from the underlying strata, such as sulfate, carbonate, nitrate, organic matter, and many dissolved metals. The removal of selenate from MIW is desired, due to selenate's acute and chronic toxicity in aquatic ecosystems at elevated concentrations. However, due to the complexity of the water matrix and the presence of many other dissolved constituents, this is often very challenging. In this study, we present for the first time the reduction of selenate in a real industrial wastewater, namely MIW, and reveal a significant advantage of photocatalytic reduction; the ability to selectively reduce selenate from >500 μg L−1 to C O 2 · − ) and Se conduction band electrons are responsible for the further reduction of Se0 to hydrogen selenide (H2Se). |
| Databáze: | OpenAIRE |
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