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Facile Synthesis of a Z-Scheme ZnIn2S4/MoO3 Heterojunction with Enhanced Photocatalytic Activity under Visible Light Irradiation.
ACS Omega ( IF 3.7 ) Pub Date : 2020-04-01 , DOI: 10.1021/acsomega.0c00446 Azam Khan 1 , Mohtaram Danish 1 , Umair Alam 1 , Saad Zafar 1 , Mohammad Muneer 1
ACS Omega ( IF 3.7 ) Pub Date : 2020-04-01 , DOI: 10.1021/acsomega.0c00446 Azam Khan 1 , Mohtaram Danish 1 , Umair Alam 1 , Saad Zafar 1 , Mohammad Muneer 1
Affiliation
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Employing a visible-light-driven direct Z-scheme photocatalytic system for the abatement of organic pollutants has become the key scientific approach in the area of photocatalysis. In this study, a highly efficient Z-scheme ZnIn2S4/MoO3 heterojunction was prepared through the hydrothermal method, followed by the impregnation technique that facilitates the formation of an interface between the two phases for efficient photocatalysis. The structural, optical, and surface elemental composition and morphology of the prepared samples were characterized in detail through X-ray diffraction, UV-vis diffuse reflectance spectra, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The results indicate that the composite materials have a strong intimate contact between the two phases, which is beneficial for the effective separation of photoinduced charge carriers. The visible-light-mediated photocatalytic activity of the samples was tested by studying the degradation of methyl orange (MO), rhodamine B (RhB), and paracetamol in aqueous suspension. An optimum loading content of 40 wt % ZnIn2S4/MoO3 exhibits the best degradation efficiency toward the above pollutants compared to bare MoO3 and ZnIn2S4. The improved photocatalytic activity could be ascribed to the efficient light-harvesting property and prolonged charge separation ability of the Z-scheme ZnIn2S4/MoO3 catalyst. Based on reactive species determination results, the Z-scheme charge transfer mechanism of ZnIn2S4/MoO3 was discussed and proposed. This study paves the way toward the development of highly efficient direct Z-scheme structures for a multitude of applications.
中文翻译：
轻松合成 Z 型 ZnIn2S4/MoO3 异质结，在可见光照射下具有增强的光催化活性。
采用可见光驱动的直接Z型光催化系统来消除有机污染物已成为光催化领域的关键科学方法。在这项研究中，通过水热法制备了高效的Z型ZnIn2S4/MoO3异质结，然后采用浸渍技术，促进两相之间界面的形成，从而实现高效的光催化。通过 X 射线衍射、紫外可见漫反射光谱、X 射线光电子能谱、扫描电子显微镜和透射电子显微镜对所制备样品的结构、光学和表面元素组成和形貌进行了详细表征。结果表明，复合材料两相之间具有很强的紧密接触，有利于光生载流子的有效分离。通过研究水悬浮液中甲基橙 (MO)、罗丹明 B (RhB) 和扑热息痛的降解来测试样品的可见光介导的光催化活性。与裸露的 MoO3 和 ZnIn2S4 相比，40 wt% ZnIn2S4/MoO3 的最佳负载量对上述污染物表现出最佳的降解效率。光催化活性的提高可归因于 Z 型 ZnIn2S4/MoO3 催化剂的高效集光性能和延长的电荷分离能力。基于活性物质测定结果，讨论并提出了ZnIn2S4/MoO3的Z型电荷转移机制。这项研究为开发适用于多种应用的高效直接 Z 型结构铺平了道路。
更新日期：2020-04-14
中文翻译：
轻松合成 Z 型 ZnIn2S4/MoO3 异质结，在可见光照射下具有增强的光催化活性。
采用可见光驱动的直接Z型光催化系统来消除有机污染物已成为光催化领域的关键科学方法。在这项研究中，通过水热法制备了高效的Z型ZnIn2S4/MoO3异质结，然后采用浸渍技术，促进两相之间界面的形成，从而实现高效的光催化。通过 X 射线衍射、紫外可见漫反射光谱、X 射线光电子能谱、扫描电子显微镜和透射电子显微镜对所制备样品的结构、光学和表面元素组成和形貌进行了详细表征。结果表明，复合材料两相之间具有很强的紧密接触，有利于光生载流子的有效分离。通过研究水悬浮液中甲基橙 (MO)、罗丹明 B (RhB) 和扑热息痛的降解来测试样品的可见光介导的光催化活性。与裸露的 MoO3 和 ZnIn2S4 相比，40 wt% ZnIn2S4/MoO3 的最佳负载量对上述污染物表现出最佳的降解效率。光催化活性的提高可归因于 Z 型 ZnIn2S4/MoO3 催化剂的高效集光性能和延长的电荷分离能力。基于活性物质测定结果，讨论并提出了ZnIn2S4/MoO3的Z型电荷转移机制。这项研究为开发适用于多种应用的高效直接 Z 型结构铺平了道路。
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