Flexoelectricity-induced enhancement in carrier separation and photocatalytic activity of a photocatalyst

被引:111
作者
Cheng, Tingting [1 ]
Gao, Huajing [1 ]
Li, Ruishan [1 ]
Wang, Shifa [2 ]
Yi, Zao [3 ]
Yang, Hua [1 ]
机构
[1] Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China
[2] Chongqing Three Gorges Univ, Sch Elect & Informat Engn, Chongqing 404000, Wanzhou, Peoples R China
[3] Southwest Univ Sci & Technol, Joint Lab Extreme Condit Matter Properties, Mianyang 621010, Sichuan, Peoples R China
基金
中国国家自然科学基金;
关键词
Flexoelectricity; Photoexcited carrier separation; Ag2MoO4; Pollutant degradation; Flexo-photocatalytic mechanism; VISIBLE-LIGHT; MECHANICAL ENERGY; INORGANIC-IONS; DEGRADATION; NANOWIRES; METAL; PERFORMANCE; OXIDATION; ALCOHOLS; SOLAR;
D O I
10.1016/j.apsusc.2021.150669
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this paper, we have elucidated the role of flexoelectricity in the photoexcited carrier separation and photocatalysis enhancement by comparatively investigating the photocatalytic, flexocatalytic and flexo-photocatalytic activities of centrosymmetric Ag2MoO4 photo-catalyst for degrading methylene blue (MB). Ultrasonic vibration was used to induce the flexoelectric effect in Ag2MoO4, and the flexo-photocatalytic experiment was performed by simultaneously irradiating the reaction solution with simulated sunlight and ultrasonic wave. It is demonstrated that the photo-flexocatalysis of Ag2MoO4 is much higher than its single photocatalysis and flexocatalysis, implying an obvious flexoelectricity-enhanced mechanism of photocatalysis. To incorporate the photo-flexocatalysis of Ag2MoO4 into practical application in environmental purification, the effects of initial MB concentration, catalyst dosage, pH and various anions on the flexo-photocatalytic degradation of MB over Ag2MoO4 were investigated. Flexo-photocatalytic degradation of methyl orange (MO)/rhodamine B (RhB)/MB mixture dyes and other organic pollutants including tetracycline hydrochloride (TC) and ciprofloxacin (CIP) were also investigated, further confirming the excellent flexo-photocatalytic performance of Ag2MoO4.
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页数:10
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