Study the photocatalytic mechanism of the novel Ag/p-Ag2O/n-BiVO4 plasmonic photocatalyst for the simultaneous removal of BPA and chromium(VI)
Study the photocatalytic mechanism of the novel Ag/p-Ag2O/n-BiVO4 plasmonic photocatalyst for the simultaneous removal of BPA and chromium(VI)
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研究新型Ag/p-Ag2O/n-BiVO4等离子体光催化剂同时去除BPA和六价铬的光催化机理
DOI：
10.1016/j.cej.2018.12.181
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发表时间：
2019-04
影响因子：
15.1
通讯作者：
Leung Dennis Y. C.
中科院分区：
文献类型：
--
作者：
Zhao Wei;Zhang Jin;Zhu Fengxia;Mu Feihu;Zhang Lili;Dai Benlin;Xu Jiming;Zhu Anfeng;Sun Cheng;Leung Dennis Y. C.
在此，我们成功构建了一种新型花状Ag/p-Ag 2 O/n-BiVO 4等离子体光催化剂，用于在可见光照射下同时光催化氧化BPA和还原铬（VI）。其中2 mM-Ag/p-Ag 2 O/n-BiVO 4的光催化性能最好。可见光照射100 min后，光催化还原和氧化效率分别达到69.8%和91.9%。探讨了等离子体光催化剂的增强机理，其主要原因是Ag/p-Ag 2 O/n-BiVO 4在可见光区吸收增强，促进了电荷转移，抑制了电子-空穴对的复合.电化学阻抗谱、荧光发射光谱和时间分辨荧光发射衰减光谱的结果表明，Ag/p-Ag 2 O/n-BiVO 4等离子体光催化剂的电荷分离增强。自由基清除实验表明，在光催化氧化反应中，h+和dotOH自由基起着关键作用。DMPO自旋捕获技术证实了光催化还原过程中的光生电子。此外，各种光催化剂的能带结构，揭示了通过价带XPS谱和费米能级由CASTEP程序获得。
Herein, we demonstrate the successful construction of a novel flowerlike Ag/p-Ag2O/n-BiVO4plasmonic photocatalyst for the photocatalytic oxidation of BPA and reduction of chromium(VI) simultaneously under visible light irradiation. Among these samples, 2mM-Ag/p-Ag2O/n-BiVO4exhibits the highest photocatalytic performances. The photocatalytic reduction and oxidation efficiency can achieve 69.8 and 91.9%, respectively, after 100 min visible-light irradiation. The enhancement mechanism for the plasmonic photocatalyst is explored, which can be attributed to the enhanced absorbance in the visible light region, and the facilitated charge transfer and the suppressed recombination of electron-hole pairs in the Ag/p-Ag2O/n-BiVO4. The results of the electrochemical impedance spectroscopy, the fluorescence emission spectra and the time-resolved fluorescence emission decay spectra indicate the enhanced charge separation in the Ag/p-Ag2O/n-BiVO4plasmonic photocatalyst. In addition, the free radical scavenging test shows that h+and radical dotOH radicals play crucial roles in the photocatalytic oxidation reaction. The photogenerated electrons in the photocatalytic reduction process, are confirmed by the DMPO spin-trapping technology. Moreover, the band structures of various photocatalysts are revealed via the valence band XPS spectra and the Fermi level obtained by CASTEP code.
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