Coupling urchin-like TiO2 nanospheres with nitrogen and sulfur co-doped graphene quantum dots for visible-light-induced degradation of toluene

文献类型： 外文期刊

第一作者： Tang, Juntao

作者： Tang, Juntao;Zhu, Jiaxin;Liu, Luzhen;He, Zhiqiao;Wang, Da;Song, Shuang;Xia, Lin;Xu, Xing

作者机构：

关键词： Photocatalysis; Urchin-likeTiO2 nanospheres; N and S co-doped graphene quantum dots; S-scheme heterojunction; Toluene degradation

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：15.1； 五年影响因子：14.3 ）

ISSN： 1385-8947

年卷期： 2024 年 482 卷

页码：

收录情况： SCI

摘要： The development of efficient catalysts for the photocatalytic degradation of volatile organic compounds is paramount. Herein, urchin-like TiO2 nanospheres were coupled with nitrogen and sulfur co-doped graphene quantum dots (NSGDs) through a facile impregnation method. The resulting NSGDs/TiO2 composite forms an Sscheme heterojunction, owing to work function difference, which facilitates the effective separation of photogenerated charge carriers. The NSGDs/TiO2 exhibits an impressive 99.8 % toluene conversion efficiency and 50 % mineralization efficiency during 6 h of visible light illumination. Furthermore, this composite retains its catalytic activity over five consecutive cycles. The remarkable performance is attributed to the augmented visible light absorption and reduced recombination of photogenerated carriers, stemming from the increased electron density of Ti and the establishment of an internal electric field. Photogenerated holes, superoxide radicals, and hydroxyl radicals are identified as the key active species in this process.

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