Z-scheme Ag₃PO₄/Ag/SrTiO₃ Heterojunction for Visible-Light Induced Photothermal Synergistic VOCs Degradation with Enhanced Performance

Abstract

Z-scheme heterojunctions are an emerging kind of photocatalysts for environmental and energy applications due to their unique charges separation and transfer route as well as strong redox ability. Considering that the electron transport media used in Z-scheme, such as noble metal particles, are also potential thermal catalysts, herein, we propose the construction of Z-scheme photothermal synergistic catalysts and their applications in VOCs degradation. Z-scheme heterojunction Ag 3 PO 4 /Ag/SrTiO 3 (or AgPO/Ag/STO) was constructed and showed remarkably strong visible light response and improved redox ability for oxidative species (•OH and •O 2 − ) production in comparison with the single AgPO and STO. A cooperative effect between visible-light induced photocatalysis and thermocatalysis was proved in the degradation of VOCs over AgPO/Ag/STO, leading to an enhanced performance. Such a Zscheme photothermocatalyst concept provides a new catalyst design route for future environmental application.

Photocatalytic oxidation of pollutants in gas-phase via Ag3PO4-based semiconductor photocatalysts: Recent progress, new trends, and future perspectives

“…7D), calcined over different temperatures, the incremental increase photocatalytic activity might be due to metallic silver particles presence over Ag3PO4, and its behavior as photogenerated electrons trappers is more beneficial for electron aggregation and transformation. The decrease in photocatalytic performance with an increase in calcined temperature is might be due to the complete decomposition of Ag3PO4 at a higher temperature of 700 • C. Another report from Ji et al (Ji et al, 2019) investigated the Z-scheme Ag3PO4/Ag/SrTiO3…”

“…SrTiO3 is one of the most commonly studied perovskite structures for photocatalytic application (Ji et al, 2019;Kong et al, 2016;Yue et al, 2018); it exhibits high corrosion resistance (Kong et al, 2016;Yue et al, 2018), chemical stability (Kong et al, 2016), low cost (Kong et al, 2016), and non-toxicity (Kong et al, 2016;Zhang et al, 2010). It has been verified as an efficient photocatalyst for improving Ag3PO4 photocatalytic activity (Kong et al, 2016;Saadetnejad and Yıldırım, 2018;Yue et al, 2018).…”

Recent advances in VOCs and CO removal via photothermal synergistic catalysis

“…Z-scheme heterojunctions are widely used in photocatalysis owing to their high charge separation and strong redox ability. Ji and coworker [112] prepared a Z-scheme Ag3PO4/Ag/SrTiO3 heterojunction catalyst bridged via Ag NPs. The photothermocatalytic toluene removal efficiency was 92% at 90 °C, which was much higher than the photocatalytic and thermocatalytic activities.…”

Preparation of g-C3N4/MoS2 Composite Material and Its Visible Light Catalytic Performance

“…But they react only in violet light and are not very e cient, which also hampers their use [4]. After decades of exploration and development, a large number of new semiconductor photocatalysts have been developed, such as metal oxide [5][6][7], metal sul de [8,9], silver halide [10,11], silver phosphate [12,13], layered bismuth oxyhalide [14,15], and so on. New semiconductor photocatalysts can form a suitable bandwidth and use sunlight more e ciently.…”