SnO2/TiO2 nanotube heterojunction: The first investigation of NO degradation by visible light-driven photocatalysis

Tran Hong Huy, Dai Phat Bui, Fei Kang, Ya Fen Wang, Shou Heng Liu, Cao Minh Thi, Sheng Jie You, Gen Mu Chang, Van Viet Pham

研究成果: Article同行評審

109 引文 斯高帕斯(Scopus)


Titania (TiO2) as a commercial photocatalyst has been continually struggling due to the limitation of ultraviolet light response and the high recombination rate of photoinduced carriers. The development of heterojunction nanostructures provides great promise to achieve the activation by visible light and suppress the photoinduced electron-hole pairs recombination. Herein, we synthesized a SnO2 and TiO2 nanotube heterojunction (SnO2/TNT) via a one-step hydrothermal strategy and systematically investigated NO photocatalytic degradation over the SnO2/TNTs heterojunction under visible light at the parts per billion level. Various physicochemical characterization techniques were conducted to verify the physical and chemical properties of the materials. For example, the morphology and lattice spacings of the materials were examined by high-resolution TEM (HR-TEM) images and selected area electron diffraction (SAED) pattern, X-ray photoelectron spectroscopy (XPS) was employed to study the oxidation states and propose the band alignment diagram of the SnO2/TNTs heterojunction, and photoluminescence spectroscopy was employed for understanding of carrier's trapping, migration and transfer. The photocatalytic results show that the SnO2/TNTs heterojunction exhibits the superior photocatalytic performance, and the photocatalytic degradation efficiency of NO can reach 60% under visible light with effective inhibition of NO2 production. The excellent photocatalytic ability is due to the low recombination rate of the photoinduced electron–hole pairs. Furthermore, a trapping experiment was combined with electron spin resonance (ESR) and utilized to identify the involvement of reactive radicals in the photocatalysis process suggesting that [Figure presented] and [rad]OH mediated pathways play a predominant role in NO removal.

頁(從 - 到)323-332
出版狀態Published - 2019 1月

All Science Journal Classification (ASJC) codes

  • 環境工程
  • 環境化學
  • 一般化學
  • 污染
  • 公共衛生、環境和職業健康
  • 健康、毒理學和誘變


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