A novel 3D plasmonic p-n heterojunction photocatalyst: Ag nanoparticles on flower-like p-Ag2S/n-BiVO4 and its excellent photocatalytic reduction and oxidation activities
A novel 3D plasmonic p-n heterojunction photocatalyst: Ag nanoparticles on flower-like p-Ag2S/n-BiVO4 and its excellent photocatalytic reduction and oxidation activities
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DOI：
10.1016/j.apcatb.2018.02.008
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发表时间：
2018-08
期刊：
影响因子：
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通讯作者：
Zhao Wei;Zhao Wei;Benlin Dai;Fengxia Zhu;Xinyue Tu;Jiming Xu;Zhang Lili;Shiyin Li;
中科院分区：
文献类型：
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作者：
Zhao Wei;Zhao Wei;Benlin Dai;Fengxia Zhu;Xinyue Tu;Jiming Xu;Zhang Lili;Shiyin Li;
通过在n型BiVO 4上沉积p型Ag 2S，然后进行光还原，成功制备了一种新型的3D结构Ag/p-Ag 2S/n-BiVO 4等离子体异质结光催化剂。在这种新颖的等离子体p-n异质结光催化剂结构中，p-n异质结可以起到抑制电荷复合的作用，而Ag的表面等离子体共振可以增强可见光的吸收。对于盐酸土霉素（OTH）的光催化氧化和Cr 6+的光催化还原，Ag/p-Ag 2S/n-BiVO 4的光催化性能优于BiVO 4和p-Ag 2S/n-BiVO 4。活性物种检测结果表明，在光催化氧化OTH过程中，h+自由基是主要的活性物种。此外，还通过气相色谱-质谱联用仪（GC-MS）鉴定了13种OTH光催化降解中间体和产物。最后，对Ag/p-Ag 2S/n-BiVO 4光催化氧化还原机理进行了详细的探讨。本研究将有助于新型等离子体p-n异质结光催化剂的开发，对满足未来日益增长的环保需求具有重要意义。
A novel 3D structure Ag/p-Ag2S/n-BiVO4plasmonic p-n heterojunction photocatalyst was successfully fabricated via a depositing p-type Ag2S on n-type BiVO4, followed by light reduction. In this innovative plasmonic p-n heterojunction photocatalyst strcture, p-n heterojunction can play the role of suppression of charge recombination, and surface plasmon resonance of Ag can enhance the absorption of visible light confirmed by finite difference time domain (FDTD) simulations method. For the photocatalytic oxidation of oxytetracycline hydrochloride (OTH) and reduction of Cr6+, the Ag/p-Ag2S/n-BiVO4exhibits excellent photocatalytic performance, compared with BiVO4and p-Ag2S/n-BiVO4. The results of active species detection reveal that h+radical is the main reactive species in the photocatalytic oxidation of OTH. Moreover, 13 photocatalytic degradation intermediates and products of OTH were also identified by the gas chromatography-mass spectrometer (GC-MS). Finally, the photocatalytic oxidation and reduction mechanism over Ag/p-Ag2S/n-BiVO4was discussed in detail. The present study will benefit the development of the new plasmonic p-n heterojunction photocatalysts and would be of great importance to meet ever-increasing environmental demands in the future.