AgI Nanoparticles Decorated Bi 24 O 31 Br 10 Nanosheets: An Efficient 0D/2D Z-Scheme Heterojunction Photocatalyst for th
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AgI Nanoparticles Decorated Bi24O31Br10 Nanosheets: An Efficient 0D/2D Z‑Scheme Heterojunction Photocatalyst for the Degradation of Rhodamine B Tingting Ding1 · Xinyan Xiao1 · Yi Wang1 · Mingli Lu1 Received: 17 April 2020 / Accepted: 9 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A novel 0D/2D Z-scheme AgI/Bi24O31Br10 photocatalyst was prepared through the simple solvothermal and coprecipitation method, in which AgI nanoparticles were decorated on the surface of Bi24O31Br10 nanosheets. The AgI/Bi24O31Br10 composites exhibited improved photocatalytic activity for the degradation of rhodamine B (RhB) in comparison with pristine Bi24O31Br10 and AgI under simulated sunlight irradiation. Specifically, AB-30 (mass fraction of AgI, 30%) composite exhibited remarkable photocatalytic activity of 97.6% towards RhB degradation under 120 min of simulated sunlight irradiation, and its RhB degradation rate constant (k) was approximately 20.7 and 2.9 times higher than that of pure Bi24O31Br10 and AgI, respectively. The improvement of photocatalytic performance of as-prepared AgI/Bi24O31Br10 heterojunction composites was ascribed to the synergistic effect of wide visible-light harvest capacity and the rapid transfer and separation efficiency of charge carriers. UV–vis diffuse reflectance spectra (DRS) analysis validated that the introduction of AgI could broaden the visible-light absorption of AgI/Bi24O31Br10 composite. The results of electrochemical impedance (EIS), photocurrent response and photoluminescence spectra (PL) tests showed that AgI/Bi24O31Br10 composite possessed the efficient separation and migration of photogenerated charge carriers. Trapping experiments of free radicals certified that ·O2− was the main reactive species in the process of degradation. And a probable photocatalytic mechanism of Z-scheme heterojunction between Bi24O31Br10 and AgI was proposed. Keywords AgI/Bi24O31Br10 · 0D/2D heterostructure · Z-scheme heterojunction · Photocatalytic degradation
1 Introduction Recently, water contamination associated with organic pollutants has received great concern because of its adverse effects on environment problems and human health [1–3]. Therefore, the effective solution of water pollution is great significance to social development. Luckily, Photocatalytic technology with the advantages of low cost, environment friendly and no secondary pollution is recognized as one of the most effective way to remove organic pollutants [4–6]. Recently, Bi-based photocatalytic materials with suitable band structure, high stability and good visible light response * Xinyan Xiao [email protected] 1
School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Guangzhou 510640, China
has attracted much attention in the field of photocatalysis, such as Bismuth halide BiOX (X = Cl, Br, I) [7–9], BiVO4 [10] and B i2WO6 [11]. Among them, B i24O31Br10 as a novel photocatalyst with
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