All-solid-state Z-scheme BiOX(Cl, Br)-Au-CdS heterostructure: Photocatalytic activity and degradation pathway
All-solid-state Z-scheme BiOX(Cl, Br)-Au-CdS heterostructure: Photocatalytic activity and degradation pathway
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DOI：
10.1016/j.colsurfa.2020.124778
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发表时间：
2020-10
期刊：
影响因子：
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通讯作者：
Min Zhang;Hongfei Yin;Jiacheng Yao;M. Arif;Bocheng Qiu;Pengyan Li;Xiaoheng Liu
中科院分区：
文献类型：
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作者：
Min Zhang;Hongfei Yin;Jiacheng Yao;M. Arif;Bocheng Qiu;Pengyan Li;Xiaoheng Liu
CdS易受光腐蚀的缺点限制了其在光催化领域的应用。本工作采用分步沉积法制备了具有Z型能带结构的BiOX（Cl，Br）-Au-CdS光催化剂。XRD、TEM和SEM分析表明，Au纳米粒子通过光沉积法沉积在BiOX纳米片上。随后，由于强烈的S-Au相互作用，CdS原位沉积在Au纳米颗粒上。在可见光催化降解阳离子染料罗丹明B方面，Z型BiOX（Cl，Br）-Au-CdS比BiOX，BiOX-Au表现出更好的光催化活性。自由基捕获实验表明，自由基dotOH、h+和dotO 2-是BiOX（Cl，Br）-Au-CdS催化剂降解有机污染物的主要活性物种。此外，通过光电化学测量和能带电位计算，证实了BiOX（Cl，Br）-Au-CdS的Z型结构。基于液相色谱-质谱联用技术（LC-MS），提出了罗丹明B的光催化降解途径。BiOX（Cl，Br）-Au-CdS作为一种高活性可见光催化剂，在污染物去除和环境修复方面具有潜在的应用前景。
The disadvantage of CdS prone to photocorrosion limits its application in photocatalysis. In this work, we have prepared BiOX(Cl, Br)-Au-CdS photocatalyst with Z-scheme band structure by progressively deposition of Au and CdS. The XRD, TEM and SEM shows that Au nanoparticles were deposited by photodeposition on the BiOX nanosheets. Subsequently, the CdS in-situ deposition on Au nanoparticles due to the strong S-Au interaction. The Z-scheme BiOX(Cl, Br)-Au-CdS showed better visible-light-driven photocatalytic activity than BiOX, BiOX-Au toward the degradation of cationic dye Rhodamine B. The radical trapping experiments indicated thatradical dotOH, h+andradical dotO2−are the main reactive species responsible for the degradations of organic pollutants over BiOX(Cl, Br)-Au-CdS. Furthermore, the Z-scheme structure of BiOX(Cl, Br)-Au-CdS was confirmed by photoelectrochemical measurements and band potential calculation. Based on the combination of liquid chromatography and mass spectroscopy (LC–MS), a photocatalytic degradation pathway of rhodamine B was proposed. As a high visible-light-driven activity catalyst, BiOX(Cl, Br)-Au-CdS can be potentially used in pollutant removal and environmental remediation.