Fabrication of a novel high photocatalytic Ag/Ag3PO4/P25 (TiO2) heterojunction catalyst for reducing electron-hole pair recombination and improving photo-corrosion

被引：10

作者：

Peng, Xialin ^{[1
,2
]}

Zhang, Yonggang ^{[1
,2
]}

Liu, Ying ^{[2
]}

机构：

[1] Tianjin Polytech Univ, Key Lab Separat Membranes & Membrane Proc, Tianjin 300387, Peoples R China

[2] Tianjin Polytech Univ, Sch Environm & Chem Engn, Tianjin 300387, Peoples R China

来源：

MATERIALS RESEARCH EXPRESS | 2019年 / 6卷 / 06期

关键词：

photocatalysis; heterojunction; ESR; PNT; Ag/Ag3PO4/P25; VISIBLE-LIGHT; ORGANIC POLLUTANTS; TITANIUM-DIOXIDE; NANOTUBE ARRAYS; DEGRADATION; PERFORMANCE; EFFICIENT; COMPOSITES; OXIDE; G-C3N4;

D O I：

10.1088/2053-1591/ab0b88

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Noble metal Ag nanoparticles were deposited on Ag3PO4/P25 heterojunction structure by ultraviolet (UV) light induction to construct Ag/Ag3PO4/P25 double heterojunction catalyst for efficient decomposition of phenacetin (PNT). X-Ray Diffraction (XRD), x-ray photoelectron spectroscopy (XPS), Raman and photoluminescence (PL) spectroscopy analyses were employed to evaluate the microstructure, chemical structure and photocatalytic activity of synthesized catalyst materials. PL spectroscopy analyses revealed that a considerable enhancement in photochemistry activity of Ag3PO4/P25 due to the deposition of Ag. The effects of Ag3PO4 mass ratios, operating conditions on PNT degradation and catalyst stability were also investigated. Results showed that Ag/10% Ag3PO4/P25 under the operating conditions of catalysts concentration of 0.5 g L-1 and pHof 9.0 with UVlight irradiation displayed a better photocatalysis degradation performance. When the concentration of PNT was 20 mg L-1, the removal rate of PNT andTOCobtained from Ag/Ag3PO4/P25 system were up to 97% and 83%, respectively. The removal rate of PNT drops from 97% to 85% between the first and last cycles after 60-min conversion. Ag/Ag3PO4/P25 with a high catalytic reaction efficiency was ascribed to the deposition of Ag. Ag is an electron acceptor and Ag3PO4 have excellent electron conductivity in a heterostructure, the novel Ag/Ag3PO4/P25 composite catalyst could reduce the recombination rate of electron-hole pairs and prolong the lifetime of photogenerated electrons.

引用

页数：10

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