Xiaoqian Ma, Yu Liu, Yi Zhao, Xiaohong Chen, Junyang Leng, Anlong Zhang, Daomei Chen, Kai Xiong and Jiaqiang Wang
{"title":"自循环光催化 Fenton 系统和磁性 3D MnS 纳米片/铁-镍泡沫对有机污染物的快速降解","authors":"Xiaoqian Ma, Yu Liu, Yi Zhao, Xiaohong Chen, Junyang Leng, Anlong Zhang, Daomei Chen, Kai Xiong and Jiaqiang Wang","doi":"10.1039/D4EN00452C","DOIUrl":null,"url":null,"abstract":"<p >Photocatalytic self-Fenton systems by coupling photocatalysis and Fenton technology overcome the limitations of conventional Fenton reactions by <em>in situ</em> generation and activation of H<small><sub>2</sub></small>O<small><sub>2</sub></small>. However, a considerable amount of iron sludge is still produced. In this study, we developed a novel self-cycled photocatalytic Fenton process for the degradation of organic pollutants <em>via</em> an iron–nickel foam-supported MnS nanosheet (MnS/INF). Without the external addition of both H<small><sub>2</sub></small>O<small><sub>2</sub></small> and ferrous ions, the MnS/INF 3D Z-scheme heterojunction exhibited an extremely high H<small><sub>2</sub></small>O<small><sub>2</sub></small> production rate of 25.4 mM h<small><sup>−1</sup></small> g<small><sup>−1</sup></small> under visible light irradiation, which is 2–119 times higher than those of the reported photocatalytic self-Fenton systems in the literature. The photogenerated electrons of MnS/INF can participate in the Fe<small><sup>2+</sup></small>/Fe<small><sup>3+</sup></small> cycle process to promote H<small><sub>2</sub></small>O<small><sub>2</sub></small> activation, significantly enhancing the catalytic performance owing to the formation of a 3D Z-scheme heterojunction. DFT calculations indicate that MnS/INF can lower the energy barrier of *OOH formation and result in an enhanced photocatalytic activity of H<small><sub>2</sub></small>O<small><sub>2</sub></small> production. Magnetic MnS/INF was easily recycled, remained very stable, and mitigated the extra undesirable Fe-containing sludge and only little iron sludge (0.43 mmol L<small><sup>−1</sup></small>) was produced after nine cycles of reuse. Furthermore, large (100 cm<small><sup>2</sup></small>) MnS/INF was used for an unassisted solar-driven <em>in situ</em> photocatalytic H<small><sub>2</sub></small>O<small><sub>2</sub></small> production and rapid degradation of RhB with requirements of only water, oxygen and sunlight. In addition, MnS/INF also exhibited good performance in real wastewater containing fluoronitrobenzene from a factory (initial COD 2310 mg L<small><sup>−1</sup></small>) and wastewater from a sewage treatment station (initial COD 106 mg L<small><sup>−1</sup></small>). This work may provide leverage to minimize iron sludge from the Fenton reaction's source.</p>","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":null,"pages":null},"PeriodicalIF":5.8000,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Self-cycled photocatalytic Fenton system and rapid degradation of organic pollutants over magnetic 3D MnS nanosheet/iron–nickel foam†\",\"authors\":\"Xiaoqian Ma, Yu Liu, Yi Zhao, Xiaohong Chen, Junyang Leng, Anlong Zhang, Daomei Chen, Kai Xiong and Jiaqiang Wang\",\"doi\":\"10.1039/D4EN00452C\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >Photocatalytic self-Fenton systems by coupling photocatalysis and Fenton technology overcome the limitations of conventional Fenton reactions by <em>in situ</em> generation and activation of H<small><sub>2</sub></small>O<small><sub>2</sub></small>. However, a considerable amount of iron sludge is still produced. In this study, we developed a novel self-cycled photocatalytic Fenton process for the degradation of organic pollutants <em>via</em> an iron–nickel foam-supported MnS nanosheet (MnS/INF). Without the external addition of both H<small><sub>2</sub></small>O<small><sub>2</sub></small> and ferrous ions, the MnS/INF 3D Z-scheme heterojunction exhibited an extremely high H<small><sub>2</sub></small>O<small><sub>2</sub></small> production rate of 25.4 mM h<small><sup>−1</sup></small> g<small><sup>−1</sup></small> under visible light irradiation, which is 2–119 times higher than those of the reported photocatalytic self-Fenton systems in the literature. The photogenerated electrons of MnS/INF can participate in the Fe<small><sup>2+</sup></small>/Fe<small><sup>3+</sup></small> cycle process to promote H<small><sub>2</sub></small>O<small><sub>2</sub></small> activation, significantly enhancing the catalytic performance owing to the formation of a 3D Z-scheme heterojunction. DFT calculations indicate that MnS/INF can lower the energy barrier of *OOH formation and result in an enhanced photocatalytic activity of H<small><sub>2</sub></small>O<small><sub>2</sub></small> production. Magnetic MnS/INF was easily recycled, remained very stable, and mitigated the extra undesirable Fe-containing sludge and only little iron sludge (0.43 mmol L<small><sup>−1</sup></small>) was produced after nine cycles of reuse. Furthermore, large (100 cm<small><sup>2</sup></small>) MnS/INF was used for an unassisted solar-driven <em>in situ</em> photocatalytic H<small><sub>2</sub></small>O<small><sub>2</sub></small> production and rapid degradation of RhB with requirements of only water, oxygen and sunlight. In addition, MnS/INF also exhibited good performance in real wastewater containing fluoronitrobenzene from a factory (initial COD 2310 mg L<small><sup>−1</sup></small>) and wastewater from a sewage treatment station (initial COD 106 mg L<small><sup>−1</sup></small>). 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Self-cycled photocatalytic Fenton system and rapid degradation of organic pollutants over magnetic 3D MnS nanosheet/iron–nickel foam†
Photocatalytic self-Fenton systems by coupling photocatalysis and Fenton technology overcome the limitations of conventional Fenton reactions by in situ generation and activation of H2O2. However, a considerable amount of iron sludge is still produced. In this study, we developed a novel self-cycled photocatalytic Fenton process for the degradation of organic pollutants via an iron–nickel foam-supported MnS nanosheet (MnS/INF). Without the external addition of both H2O2 and ferrous ions, the MnS/INF 3D Z-scheme heterojunction exhibited an extremely high H2O2 production rate of 25.4 mM h−1 g−1 under visible light irradiation, which is 2–119 times higher than those of the reported photocatalytic self-Fenton systems in the literature. The photogenerated electrons of MnS/INF can participate in the Fe2+/Fe3+ cycle process to promote H2O2 activation, significantly enhancing the catalytic performance owing to the formation of a 3D Z-scheme heterojunction. DFT calculations indicate that MnS/INF can lower the energy barrier of *OOH formation and result in an enhanced photocatalytic activity of H2O2 production. Magnetic MnS/INF was easily recycled, remained very stable, and mitigated the extra undesirable Fe-containing sludge and only little iron sludge (0.43 mmol L−1) was produced after nine cycles of reuse. Furthermore, large (100 cm2) MnS/INF was used for an unassisted solar-driven in situ photocatalytic H2O2 production and rapid degradation of RhB with requirements of only water, oxygen and sunlight. In addition, MnS/INF also exhibited good performance in real wastewater containing fluoronitrobenzene from a factory (initial COD 2310 mg L−1) and wastewater from a sewage treatment station (initial COD 106 mg L−1). This work may provide leverage to minimize iron sludge from the Fenton reaction's source.
期刊介绍:
Environmental Science: Nano serves as a comprehensive and high-impact peer-reviewed source of information on the design and demonstration of engineered nanomaterials for environment-based applications. It also covers the interactions between engineered, natural, and incidental nanomaterials with biological and environmental systems. This scope includes, but is not limited to, the following topic areas:
Novel nanomaterial-based applications for water, air, soil, food, and energy sustainability
Nanomaterial interactions with biological systems and nanotoxicology
Environmental fate, reactivity, and transformations of nanoscale materials
Nanoscale processes in the environment
Sustainable nanotechnology including rational nanomaterial design, life cycle assessment, risk/benefit analysis