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Construction of self-sufficient Z-scheme Ag3PW12O40/TiO2 photocatalysts for the improved visible-light-driven photo-degradation of rhodamine B

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Abstract

Nanotube titanic acid (denoted as NTA), a tubular mesoporous material, after it undergoes heat-treatment at high temperature, is a novel kind of TiO2 containing a single-electron-trapped oxygen vacancy (V •O ) originating from the intra-layered dehydration of NTA that can be achieved. Unfortunately, the presence of oxygen vacancy arouses the response of the novel TiO2 to visible light, but it is inert under visible-light irradiation because of the absence of the efficient electron acceptors. Just making up for the rapid charge recombination of unitary system photocatalyst, by facilitating the electron fast transfer simultaneously, a series of Ag3PW12O40/TiO2 composite photocatalysts were synthesized via a facile hydrothermal route using Ag3PW12O40 (a kind of saturated Keggin polyoxometallate) and nanotube titanic acid (NTA) as starting material. As-fabricated photocatalysts were characterized by XRD, UV–Vis DRS, XPS, ESR, BET, SEM, TEM, PL and photoelectrochemical measurements. The photocatalytic performance of these composites was appraised by monitoring the photo-degradation of organic pollutant rhodamine B (10 mg/L) under visible-light irradiation (420 nm < λ < 800 nm) a with spectrophotometer. The as-prepared Ag3PW12O40/TiO2 composites displayed enhanced photocatalytic performance towards the decomposition of rhodamine B. The active species trapping experiment revealed that the significantly improved photocatalytic activity was attributed to the constructing of Z-scheme Ag3PW12O40/Ag/TiO2, greatly inducing the efficient separation of the photo-generated carriers by means of Ag nanoparticles serving as the charge transmission channel. Herein, Ag nanoparticles were formed via the reduction of Ag+ by the electrons in the oxygen vacancy state during hydrothermal preparation. At the same time, the present work provides a new way to extend application of other polyoxometalates in the photocatalysis field.

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Acknowledgements

This work has been supported by the National Natural Science Foundation of China (Nos. 21471045, 21571049), the Natural Science Foundation of Henan Province of China (Nos. 162300410027, 162300410013), the Foundation of the Education Department of Henan Province of China (13A150045), Open Research Funds of Henan Key Laboratory of Polyoxometalate Chemistry (HNPOMKF1607, HNPOMKF1701) and the Scientific Fund of Henan Province Postdoctor (in 2016, First Aid).

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  1. Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, People’s Republic of China

    Shengnan Cai, Shukui Shi, Haiyan Li, Yan Bai & Dongbin Dang

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  1. Shengnan Cai
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  2. Shukui Shi
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Correspondence to Haiyan Li, Yan Bai or Dongbin Dang.

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Cai, S., Shi, S., Li, H. et al. Construction of self-sufficient Z-scheme Ag3PW12O40/TiO2 photocatalysts for the improved visible-light-driven photo-degradation of rhodamine B. Res Chem Intermed 44, 7769–7788 (2018). https://doi.org/10.1007/s11164-018-3585-8

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