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Enhanced photocatalytic performance of BiVO4 in aqueous AgNO3 solution under visible light irradiation

机译：可见光照射下增强的BiVO4在AgNO3水溶液中的光催化性能

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摘要

Monoclinic-phase bismuth vanadate (BiVO4) with a 2.468 eV band gap exhibited enhanced synergic photodegradation activity toward methylene blue (MB) when combined with silver ions (Ag+) in an aqueous solution under visible light irradiation. The mass ratio of AgNO3 to BiVO4 and the calcination temperature were discovered to considerably affect the degradation activity of BiVO4/Ag+. Superior photocatalytic performance was obtained when BiVO4 was mixed with 0.01%(w/v)AgNO3 solution, and complete degradation of MB was achieved after 25 min visible light irradiation, outperforming BiVO4 or AgNO3 solution alone. The enhanced photodegradation was investigated using systematic luminescence measurements, electrochemical impedance spectroscopy, and scavenger addition, after which a photocatalytic mechanism for MB degradation under visible light irradiation was identified that involved oxygen radicals and holes. This study also discovered the two dominating processes involved in enhancing the electron hole separation efficiency and reducing their recombination rate, namely photoreduction of Ag+ and the formation of a BiVO4/Ag heterojunction. The synergic effect between BiVO4 and Ag+ was discovered to be unique. BiVO4/Ag+ was successfully used to degrade two other dyes and disinfect Escherichia Coli. A unique fluorescent technique using BiVO4 and a R6G solution to detect Ag+ ions in water was discovered. (C) 2016 Elsevier B.V. All rights reserved.
机译：带隙为2.468 eV的单斜晶相钒酸铋（BiVO4）与银离子（Ag +）在水溶液中在可见光照射下结合时，对亚甲基蓝（MB）表现出增强的协同光降解活性。发现AgNO 3与BiVO 4的质量比和煅烧温度显着影响BiVO 4 / Ag +的降解活性。当BiVO4与0.01％（w / v）AgNO3溶液混合时，可获得优异的光催化性能，可见光照射25分钟后MB完全降解，性能优于单独的BiVO4或AgNO3溶液。使用系统发光测量，电化学阻抗谱和清除剂研究了增强的光降解作用，然后确定了可见光照射下MB降解的光催化机理，该机理涉及氧自由基和空穴。这项研究还发现了两个主要过程，这些过程涉及提高电子空穴分离效率和降低其复合率，即Ag +的光还原和BiVO4 / Ag异质结的形成。发现BiVO4和Ag +之间的协同作用是独特的。 BiVO4 / Ag +已成功用于降解其他两种染料并消毒大肠杆菌。发现了一种独特的荧光技术，该技术使用BiVO4和R6G溶液检测水中的Ag +离子。 （C）2016 Elsevier B.V.保留所有权利。

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