Zhuo Wang, Ling Ma, Bingzhang Chen, Yubo Zhang, Kai Hong Wong, Wei Zhao, Chunxia Wang, Guoyong Huang and Shengming Xu
{"title":"A green and efficient strategy to utilize spent SCR catalyst carriers: in situ remediation of Cu@TiO2 for photocatalytic hydrogen evolution†","authors":"Zhuo Wang, Ling Ma, Bingzhang Chen, Yubo Zhang, Kai Hong Wong, Wei Zhao, Chunxia Wang, Guoyong Huang and Shengming Xu","doi":"10.1039/D4GC04806G","DOIUrl":null,"url":null,"abstract":"<p >The selective utilization of titanium dioxide (TiO<small><sub>2</sub></small>) carriers in spent selective catalytic reduction (SCR) catalysts offers a promising strategy to alleviate environmental pollution and recover high-value resources. Herein, we report a green and sustainable method for the <em>in situ</em> remediation of TiO<small><sub>2</sub></small> carriers from spent SCR catalysts with a short process using a simple impregnation method to prepare recovered CR-TiO<small><sub>2</sub></small> with the deposition of Cu. When employed in photocatalytic hydrogen production, CR-TiO<small><sub>2</sub></small> achieved a hydrogen production rate of 388 μmol g<small><sup>−1</sup></small> h<small><sup>−1</sup></small>, which was 1.75 times higher than that of C-TiO<small><sub>2</sub></small> (commercial TiO<small><sub>2</sub></small>). Experimental results and DFT calculations demonstrated that the doping of Cu species broadened the light absorption range of TiO<small><sub>2</sub></small> and promoted water dissociation, thus enhancing its photocatalytic performance. Finally, the process was evaluated by life cycle assessment (LCA), which showed a nearly 67.8%, 71.8%, 66.5%, and 83.2% reduction in fossil fuel depletion, ozone depletion, carbon dioxide and sulfur dioxide emissions, respectively, compared to the conventional electronic-grade TiO<small><sub>2</sub></small> synthesis method. This work provides a sustainable way to produce clean, green energy by utilizing titanium resources recovered from spent SCR catalysts. Furthermore, it provides new insights into turning waste into treasure and opens up a new way to alleviate environmental problems.</p>","PeriodicalId":78,"journal":{"name":"Green Chemistry","volume":" 1","pages":" 240-247"},"PeriodicalIF":9.3000,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Green Chemistry","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2025/gc/d4gc04806g","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The selective utilization of titanium dioxide (TiO2) carriers in spent selective catalytic reduction (SCR) catalysts offers a promising strategy to alleviate environmental pollution and recover high-value resources. Herein, we report a green and sustainable method for the in situ remediation of TiO2 carriers from spent SCR catalysts with a short process using a simple impregnation method to prepare recovered CR-TiO2 with the deposition of Cu. When employed in photocatalytic hydrogen production, CR-TiO2 achieved a hydrogen production rate of 388 μmol g−1 h−1, which was 1.75 times higher than that of C-TiO2 (commercial TiO2). Experimental results and DFT calculations demonstrated that the doping of Cu species broadened the light absorption range of TiO2 and promoted water dissociation, thus enhancing its photocatalytic performance. Finally, the process was evaluated by life cycle assessment (LCA), which showed a nearly 67.8%, 71.8%, 66.5%, and 83.2% reduction in fossil fuel depletion, ozone depletion, carbon dioxide and sulfur dioxide emissions, respectively, compared to the conventional electronic-grade TiO2 synthesis method. This work provides a sustainable way to produce clean, green energy by utilizing titanium resources recovered from spent SCR catalysts. Furthermore, it provides new insights into turning waste into treasure and opens up a new way to alleviate environmental problems.
期刊介绍:
Green Chemistry is a journal that provides a unique forum for the publication of innovative research on the development of alternative green and sustainable technologies. The scope of Green Chemistry is based on the definition proposed by Anastas and Warner (Green Chemistry: Theory and Practice, P T Anastas and J C Warner, Oxford University Press, Oxford, 1998), which defines green chemistry as the utilisation of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. Green Chemistry aims to reduce the environmental impact of the chemical enterprise by developing a technology base that is inherently non-toxic to living things and the environment. The journal welcomes submissions on all aspects of research relating to this endeavor and publishes original and significant cutting-edge research that is likely to be of wide general appeal. For a work to be published, it must present a significant advance in green chemistry, including a comparison with existing methods and a demonstration of advantages over those methods.