Few-layered tungsten selenide as a co-catalyst for visible-light-driven photocatalytic production of hydrogen peroxide for bacterial inactivation,Environmental Science: Nano

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Few-layered tungsten selenide as a co-catalyst for visible-light-driven photocatalytic production of hydrogen peroxide for bacterial inactivation
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-10-10 , DOI: 10.1039/d0en00801j
Wanjun Wang _{1,

2,

3,

4,

5} , Wenquan Gu _{1,

2,

3,

4,

5} , Guiying Li _{1,

2,

3,

4,

5} , Haojing Xie _{1,

2,

3,

4,

5} , Po Keung Wong _{1,

2,

3,

4,

5} , Taicheng An _{1,

2,

3,

4,

5}

Affiliation

Sustainable and “green” technologies for hydrogen peroxide (H₂O₂) production have aroused increasing interest, yet challenges prevail in production of H₂O₂ for environmental applications. In this study, tungsten selenide (WSe₂) with a few-layered microstructure was used as a new co-catalyst to synthesize H₂O₂ under visible light irradiation. The ultrathin WSe₂ nanosheets were anchored onto a g-C₃N₄ surface by in situ growth solvothermal methods. The as-prepared WSe₂/g-C₃N₄ showed remarkably enhanced H₂O₂ production efficiency without organic electron donors, which was 11.8 times higher than that of pristine g-C₃N₄. H₂O₂ was generated via O₂ reduction mediated by photogenerated e⁻, and dissolved O₂ could be generated by water oxidation and in situ used to produce H₂O₂ under anaerobic conditions. The introduction of WSe₂ not only promoted visible light absorption, but also facilitated the charge transfer efficiency by forming a Z-scheme rather than a type II heterojunction. The photogenerated e⁻ was enriched onto WSe₂, leading to the high H₂O₂ production activity. Moreover, the in situ generated H₂O₂ could be directly used for pathogenic bacteria inactivation through Fenton reactions without external H₂O₂ addition. This work is expected to open an avenue for developing novel photocatalysts towards sustainable H₂O₂ production for water disinfection and related environmental applications.

中文翻译：

几层硒化钨作为可见光驱动的过氧化氢光催化生产细菌灭活的助催化剂

用于生产过氧化氢（H ₂ O ₂）的可持续和“绿色”技术引起了越来越多的关注，但是在用于环境应用的H ₂ O ₂生产中仍然存在挑战。在这项研究中，具有几层微观结构的硒化钨（WSe ₂）被用作在可见光照射下合成H ₂ O ₂的新型助催化剂。通过原位生长溶剂热方法将超薄的WSe ₂纳米片固定在gC ₃ N ₄表面上。准备好的WSe ₂ / gC ₃ N ₄在没有有机电子给体的条件下，H ₂ O _2的生产效率显着提高，是原始gC ₃ N _4的11.8倍。ħ ₂ ö ₂生成经由ö ₂由光生ë介导的还原^-，和溶氧₂可以通过水氧化生成，并在原位用于生成H ₂ ö ₂在无氧条件下。WSe ₂的引入不仅促进可见光吸收，而且通过形成Z来促进电荷转移效率。-方案而不是II型异质结。光生ë ^-富集到WSE ₂，导致高ħ ₂ ö ₂生产的活性。而且，原位生成的H ₂ O ₂可以通过芬顿反应直接用于致病菌的灭活，而无需添加外部H ₂ O ₂。预期这项工作将为开发新型光催化剂开辟一条道路，以实现可持续的H ₂ O ₂生产，以用于水消毒和相关的环境应用。

更新日期：2020-11-03

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