材料科学
光催化
异质结
纳米颗粒
可见光谱
化学工程
降级(电信)
微观结构
粒径
半导体
热液循环
纳米技术
复合材料
催化作用
光电子学
有机化学
化学
电信
工程类
计算机科学
作者
Degui Qian,Desheng Fang,Yifeng Xu,Haihua Hu,Ping Lin,Zixuan Ding,Peng Wang,Lingbo Xu
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2020-09-15
卷期号:31 (48): 485702-485702
被引量:4
标识
DOI:10.1088/1361-6528/abb0b9
摘要
Silver phosphate (Ag3PO4, APO) has attracted intense attention as a visible-light-driven photocatalyst, but its large-scale application is limited by severe charge recombination and inevitable photo-corrosion. Various rational APO-based heterostructures composed of APO nanoparticles (NPs) and band-matched semiconductor support are designed to address the above issues. Nevertheless, the size, density, stability, and dispersion of APO NPs are critical challenges for the photocatalytic performance of APO-based photocatalysts. Here, three-dimensional (3D) self-assembled TiO2 hierarchical spheres (THS) prepared by a simple one-step hydrothermal method are employed as innovative support, and ultrafine high-density APO NPs with an average size of about 3 nm are successfully deposited and uniformly dispersed throughout THS to form hierarchical THS/APO composites. The novel THS/APO microstructure provides abundant reactive sites for photocatalytic reactions and promotes the photogenerated charge separation and transfer due to the ultrafine size of APO NPs and the TiO2/APO Type-II heterojunction. As a result, the THS/APO composites show significant improvement in photocatalytic activity and stability in methylene blue (MB) degradation. The reaction constant of THS/APO composites far exceeds that of either THS or APO, roughly 16 and 7 times higher than that of THS and APO under full-spectrum light, and 41 and 4 times higher under visible light. Our results strongly suggest new insights into the low-cost, large-scale application of high-efficiency APO-based photocatalyst.
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