Kumari Poonam, Pande Surojit, Fageria Pragati
Department of Chemistry, University of Rajasthan, Jaipur, Rajasthan, 302004, India.
Department of Chemistry, Birla Institute of Technology and Science, Pilani, Rajasthan, 333031, India.
Environ Sci Pollut Res Int. 2023 May;30(22):61927-61944. doi: 10.1007/s11356-023-26192-1. Epub 2023 Mar 18.
Because of the growing concerns about environmental issues, the search of proficient semiconductor catalysts for pollutants degradation from contaminated water is one of the interesting areas of research. Due to the larger surface area, hollow nanomaterials with hollow interior and outer thickness illustrate a class of significant nanostructured materials. The enhanced surface area provides remarkable applications of the hollow nanomaterials in catalysis. In Kirkendall effect, pores are formed owing to the diverse diffusion rates of two nanomaterials in a diffusion couple. Here, we have introduced the facile hydrothermal synthesis of hollow nanorods of ZnO/ZnS via Kirkendall effect using ZnO nanorods (NRs). The morphologies, optical properties, compositions, and crystal structures of the as synthesized materials are systematically studied using UV-vis, PXRD, FESEM, TEM, EDS, XPS, etc. The process of synthesis and growth mechanism of hollow NRs is suggested based on the Kirkendall effect. A hollow nanomaterial, envisaged being highly efficient for molecule adsorption on its surface, the as synthesized materials were used for the photocatalytic degradation of methylene blue (MB) dye. MB degradation efficiency of 96% within 60 min was performed over ZnO/ZnS hollow NRs, which was 2.6-fold greater than that of ZnO. The rate constant of ZnO/ZnS heterostructure was 0.045 min, which was 5.5 times larger than that of bare ZnO. We have concluded our work in the directions towards the synthesis of various semiconductor hollow nanostructures for the varied catalytic reactions.
由于对环境问题的日益关注，寻找用于降解污水中污染物的高效半导体催化剂是一个有趣的研究领域。由于具有较大的表面积，内部中空且壁厚的中空纳米材料是一类重要的纳米结构材料。增大的表面积使得中空纳米材料在催化方面有显著的应用。在柯肯达尔效应中，由于扩散偶中两种纳米材料的扩散速率不同而形成孔隙。在此，我们介绍了一种通过柯肯达尔效应，利用氧化锌纳米棒（NRs）简便水热合成氧化锌/硫化锌中空纳米棒的方法。使用紫外可见光谱、粉末X射线衍射、场发射扫描电子显微镜、透射电子显微镜、能谱分析、X射线光电子能谱等对合成材料的形貌、光学性质、组成和晶体结构进行了系统研究。基于柯肯达尔效应提出了中空纳米棒的合成过程和生长机理。一种预期在其表面对分子吸附高效的中空纳米材料，所合成的材料用于光催化降解亚甲基蓝（MB）染料。在氧化锌/硫化锌中空纳米棒上，60分钟内亚甲基蓝的降解效率达到96%，比氧化锌高2.6倍。氧化锌/硫化锌异质结构的速率常数为0.045分钟，比裸氧化锌大5.5倍。我们朝着合成用于各种催化反应的各种半导体中空纳米结构的方向完成了我们的工作。
