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Atomic Ti-Nx sites with switchable coordination number for enhanced visible-light photocatalytic water disinfection

文献类型： 外文期刊

作者： Hu, Zhao 1 ; Zhang, Yujiao 1 ; Pu, Ling 3 ; Wang, Baoyu 1 ; Yang, Song 1 ; Li, Hu 1 ;

作者机构： 1.Guizhou Univ, Ctr R&D Fine Chem,State Local Joint Lab Comprehens, State Key Lab Breeding Base Green Pesticide & Agr, Key Lab Green Pesticide & Agr Bioengn, Guiyang 550025, Peoples R China

2.South Cent Univ Nationalities, Coll Chem & Mat, Wuhan 430074, Peoples R China

3.Guizhou Acad Agr Sci, Inst Anim Husb & Vet Med, Guiyang 550005, Peoples R China

关键词： Water sterilization; Single Ti atoms; Photocatalysis; Bacteria inactivation; In situO2 activation

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：11.072； 五年影响因子：11.016 ）

ISSN： 0959-6526

年卷期： 2022 年 377 卷

页码：

收录情况： SCI

摘要： Photocatalytic sterilization represents one of the promising strategies for efficient utilization of solar energy to remove hazardous materials, mainly based on the development of intrinsic materials with intact structures that actually cannot be absolutely remained under light irradiation but ignored in most cases. Herein, novel single titanium atoms anchored on g-C3N4 photocatalysts were facilely prepared by calcination of g-C3N4 with bis (cyclopentadienyl)dicarbonyl titanium. The introduction of single Ti atoms in g-C3N4 promoted photocatalytic efficiency by improving the separation efficiency of carriers with a broad visible-light-responsive range and reducing the energy barrier for the transfer of superoxide radicals to hydroxyl radicals. Especially, upon light -driven interaction with adsorbed O2, the photocatalyst coordination number could be remarkably regulated in situ from Ti-N6 to Ti-N4, which led to a more efficient generation of clean active substances in disinfectants (O2 center dot- and center dot OH). As a result, the single Ti catalyst showed superior activity in the photocatalytic disinfection of bacteria and excellent recyclability. The inactivation of E. coli for the CN-Ti50 sample was 91.2% under irra-diation for 30 min, which was 9.9 times that of pure g-C3N4. This in situ activation approach opens a new avenue for engineering efficient and energy-saving catalysts for water sterilization.

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