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Recent advances on dual-functional photocatalytic systems for combined removal of hazardous water pollutants and energy generation

Naseri, A ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1007/s11164-022-04677-x
  3. Publisher: Springer Science and Business Media B.V , 2022
  4. Abstract:
  5. Photocatalytic wastewater treatment and concurrent energy production or metal ions conversion to less harmful products have great potential to address both environmental and energy challenging issues, two of the most significant problems facing humankind. Many efforts have been devoted for achieving enhanced photocatalytic activity as well as optimizing reaction conditions and materials design. In this context, various strategies were applied to develop efficient dual-functional photocatalysts for environmental purification and simultaneous energy production. Concurrent photocatalytic degradation of organic pollutants and Cr(VI) reduction to less toxic Cr(III) improved the rate of both reactions as compared to their single process. During photocatalysis for energy production from wastewater treatment, the organic pollutant can either play as a hole scavenger or as an electron donor to increase the rate of H2 production. Moreover, variation of reaction parameters such as pH, amount of photocatalyst, temperature, type of reactor design, amount and type of organic pollutant as well as incident light intensity on the activity of the photocatalyst during simultaneous reactions are investigated. Furthermore, the design of the photocatalyst by morphology control and engineering, metal/nonmetal modification, and semiconductor coupling exhibited a key role in improving the efficiency of the concurrent photocatalytic reactions. In addition, photocatalytic conversion of CO2 as the primary greenhouse gas to value-added industrial chemicals such as fuels, alcohols, and other hydrocarbons is reviewed as a step toward solving the global environmental and energy challenging issues. Finally, the synergetic effect of adsorption process and photocatalysis by improving specific surface area of a photocatalyst to remove high concentration of organic pollutants from wastewater will be discussed. © 2022, The Author(s), under exclusive licence to Springer Nature B.V
  6. Keywords:
  7. Bifunctional ; Chromium (VI) reduction ; CO2 reduction ; H2 production ; Photocatalyst ; Carbon dioxide ; Chemicals removal (water treatment) ; Chromium compounds ; Greenhouse gases ; Hydrogen production ; Metal ions ; Metals ; Morphology ; Photocatalysis ; Wastewater treatment ; Water pollution ; % reductions ; As (III) oxidation ; Bi-functional ; Chromium VI ; CO 2 reduction ; Dual-functional ; Organic pollutant degradation ; Simultaneous ; Sunlight irradiation ; Organic pollutants ; H 2 production
  8. Source: Research on Chemical Intermediates ; Volume 48, Issue 3 , 2022 , Pages 911-933 ; 09226168 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s11164-022-04677-x