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Photocatalytic Activity of Novel Ag 4 V 2 O 7 Photocatalyst Under Visible Light Irradiation
Author(s) -
Wang Jinxiu,
Yang Xue,
Chen Jing,
Xian Jiangjun,
Meng Sugang,
Zheng Yi,
Shao Yu,
Li Danzhen
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12639
Subject(s) - photocatalysis , rhodamine b , hydrothermal circulation , degradation (telecommunications) , visible spectrum , nuclear chemistry , chemistry , polyvinylpyrrolidone , irradiation , electron paramagnetic resonance , photochemistry , materials science , analytical chemistry (journal) , chemical engineering , catalysis , chromatography , organic chemistry , nuclear magnetic resonance , optoelectronics , physics , nuclear physics , engineering , telecommunications , computer science
In this study, pure Ag 4 V 2 O 7 was synthesized via hydrothermal method without surfactant at different temperatures (100°C, 120°C, and 140°C) and pH values (4 and 5) for the first time. Moreover, Ag 4 V 2 O 7 nanoparticles with homogeneous size distribution about 200–300 nm can be obtained by adding polyvinylpyrrolidone to the synthesis system. Effects of hydrothermal synthesis conditions on photophysical properties and photocatalytic activity of Ag 4 V 2 O 7 were investigated systematically. Ag 4 V 2 O 7 sample prepared at 120°C and pH = 4 had the optimal photocatalytic activity among these samples, which almost completely degraded 10 ppm Rhodamine B within 3 h under visible light irradiation (420 nm < λ < 800 nm). The degradation products were measured by liquid chromatography–mass spectroscopy. The active species involved in the degradation process were analyzed by means of adding active species scavengers, electron spin resonance techniques, and photoelectrochemical experiments. A possible mechanism for photocatalytic degradation of organic pollutants on Ag 4 V 2 O 7 photocatalyst was proposed and discussed preliminarily.