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Facet-Heterojunction-Based Z-Scheme BiVO4{010} Microplates Decorated with AgBr-Ag Nanoparticles for the Photocatalytic Inactivation of Bacteria and the Decomposition of Organic Contaminants
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-08-18 , DOI: 10.1021/acsanm.0c00703 Shenyuan Bao 1 , Zheng Wang 1 , Jinlong Zhang 1 , Baozhu Tian 1
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-08-18 , DOI: 10.1021/acsanm.0c00703 Shenyuan Bao 1 , Zheng Wang 1 , Jinlong Zhang 1 , Baozhu Tian 1
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In the past few years, BiVO4 has received much research attention as one of the most promising photocatalysts to deal with pathogenic bacteria and organic pollutants in wastewater. However, low photocatalytic efficiency is still the main obstacle to its practical applications. Herein, we first fabricated a facet-heterojunction-based Z-scheme photocatalyst AgBr-Ag-BiVO4{010} (BiVO4{010} microplates decorated with AgBr-Ag nanoparticles) to boost the photocatalytic activity of BiVO4 for bacterium inactivation and organic pollution treatment. On account of the directed migration of photogenerated electrons in BiVO4, Ag nanoparticles were selectively produced on the {010} facets of BiVO4 microplates during photoreduction, and the out layer of Ag nanoparticles was subsequently transformed into AgBr via the co-operation of Fe3+ and Br–. The photocatalytic Escherichia coliK-12 inactivation results indicated that AgBr-Ag-BiVO4{010} displays optimal photocatalytic activity for bacterium inactivation among the current BiVO4-based photocatalytic materials, which was ∼4 and 15 times higher than those of Ag-BiVO4{010} and BiVO4, respectively. Scanning electron microscope (SEM) results revealed that the inactivation of E. coli bacteria is due to the breaking of their cell wall and leakage of the cytoplasm. Moreover, AgBr-Ag-BiVO4{010} also shows excellent photocatalytic activity in terms of tetracycline (TC) and Rhodamine B (RhB) degradation compared with BiVO4 and Ag-BiVO4{010}. On the basis of photoluminescence and photoelectrochemical analyses, we can deduce that the extraordinary photocatalytic activity of AgBr-Ag-BiVO4{010} is ascribed to the high separation efficiency of photogenerated charge carriers in the facet-heterojunction-based Z-scheme structure. The free radical trapping and electron paramagnetic resonance (EPR) spin-trap experiments disclosed that the active species in charge of organic degradation are h+, •OH, and •O2–, while only h+ and •O2– take part in the inactivation of bacteria. We believe that this study paves a feasible way for constructing cost-efficient facet-heterojunction-based Z-scheme photocatalysts with high efficiency to remediate pathogenic bacteria and organic pollutants in wastewater.
中文翻译：
AgBr-Ag纳米粒子修饰的基于面-异质结的Z方案BiVO 4 {010}微孔板用于细菌的光催化灭活和有机污染物的分解
在过去的几年中，BiVO 4作为处理废水中的病原细菌和有机污染物的最有前景的光催化剂之一，受到了很多研究关注。然而，低的光催化效率仍然是其实际应用的主要障碍。本文中，我们首先制备了一种基于多面异质结的Z型光催化剂AgBr-Ag-BiVO 4 {010}（装饰有AgBr-Ag纳米粒子的BiVO 4 {010}微板），以增强BiVO 4对细菌灭活和降解的光催化活性。有机污染处理。是考虑光生电子的BiVO定向迁移的4，银纳米颗粒选择性地对BiVO的{010}面产生4光还原期间微孔板，和Ag纳米颗粒的出层经由Fe的合作，随后转化到的AgBr 3+和Br - 。光催化大肠杆菌K -12的灭活结果表明，AgBr-Ag-BiVO 4 {010}在目前基于BiVO 4的光催化材料中显示出对细菌灭活的最佳光催化活性，比Ag-Ag高出约4倍和15倍。 BiVO 4 {010}和BiVO 4。扫描电子显微镜（SEM）结果表明，大肠杆菌的灭活细菌是由于其细胞壁的破裂和细胞质的泄漏。此外，与BiVO 4和Ag-BiVO 4 {010}相比，AgBr-Ag-BiVO 4 {010}在四环素（TC）和若丹明B（RhB）降解方面也显示出优异的光催化活性。根据光致发光和光电化学分析，我们可以推断出AgBr-Ag-BiVO 4 {010}的非凡光催化活性归因于基于面异质结的Z方案结构中光生载流子的高分离效率。自由基俘获和电子顺磁共振（EPR）自旋俘获实验表明，负责有机降解的活性物质为h +，• OH，和• ö 2 - ，而只有ħ +和• ö 2 -中的细菌灭活取一部分。我们认为，这项研究为构建具有成本效益的高效率多面异质结基Z方案光催化剂提供了可行的方法，该光催化剂能有效地修复废水中的病原细菌和有机污染物。
更新日期：2020-09-25
中文翻译：
AgBr-Ag纳米粒子修饰的基于面-异质结的Z方案BiVO 4 {010}微孔板用于细菌的光催化灭活和有机污染物的分解
在过去的几年中，BiVO 4作为处理废水中的病原细菌和有机污染物的最有前景的光催化剂之一，受到了很多研究关注。然而，低的光催化效率仍然是其实际应用的主要障碍。本文中，我们首先制备了一种基于多面异质结的Z型光催化剂AgBr-Ag-BiVO 4 {010}（装饰有AgBr-Ag纳米粒子的BiVO 4 {010}微板），以增强BiVO 4对细菌灭活和降解的光催化活性。有机污染处理。是考虑光生电子的BiVO定向迁移的4，银纳米颗粒选择性地对BiVO的{010}面产生4光还原期间微孔板，和Ag纳米颗粒的出层经由Fe的合作，随后转化到的AgBr 3+和Br - 。光催化大肠杆菌K -12的灭活结果表明，AgBr-Ag-BiVO 4 {010}在目前基于BiVO 4的光催化材料中显示出对细菌灭活的最佳光催化活性，比Ag-Ag高出约4倍和15倍。 BiVO 4 {010}和BiVO 4。扫描电子显微镜（SEM）结果表明，大肠杆菌的灭活细菌是由于其细胞壁的破裂和细胞质的泄漏。此外，与BiVO 4和Ag-BiVO 4 {010}相比，AgBr-Ag-BiVO 4 {010}在四环素（TC）和若丹明B（RhB）降解方面也显示出优异的光催化活性。根据光致发光和光电化学分析，我们可以推断出AgBr-Ag-BiVO 4 {010}的非凡光催化活性归因于基于面异质结的Z方案结构中光生载流子的高分离效率。自由基俘获和电子顺磁共振（EPR）自旋俘获实验表明，负责有机降解的活性物质为h +，• OH，和• ö 2 - ，而只有ħ +和• ö 2 -中的细菌灭活取一部分。我们认为，这项研究为构建具有成本效益的高效率多面异质结基Z方案光催化剂提供了可行的方法，该光催化剂能有效地修复废水中的病原细菌和有机污染物。
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