Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, PR China.
Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, PR China.
J Colloid Interface Sci. 2018 Aug 15;524:379-387. doi: 10.1016/j.jcis.2018.03.114. Epub 2018 Apr 2.
A novel class of CdS@UIO-66-NH core shell heterojunction was fabricated by the facile in-situ solvothermal method. Characterizations show that porous UIO-66-NH shell not only allows the visible light to be absorbed on CdS nanorod core, but also provides abundant catalytic active sites as well as an intimate heterojunction interface between UIO-66-NH shell and CdS nanorod core. By taking advantage of this property, the core-shell composite presents highly solar-driven photocatalytic performance compared with pristine UIO-66-NH and CdS nanorod for the degradation of organic dyes including malachite green (MG) and methyl orange (MO), and displays superior photostability after four recycles. Furthermore, the photoelectrochemical performance of CdS@UIO-66-NH can be measured by the UV-vis spectra, Mott-Schottky plots and photocurrent. The remarkably enhanced photocatalytic activity of CdS@UIO-66-NH can be ascribed to high surface areas, intimate interaction on molecular scale and the formation of one-dimensional heterojunction with n-n type. What's more, the core-shell heterostructural CdS@UIO-66-NH can facilitate the effective separation and transfer of the photoinduced interfacial electron-hole pairs and protect CdS nanorod core from photocorrosion.
一种新型的 CdS@UIO-66-NH 核壳异质结是通过简便的原位溶剂热法制备的。表征表明，多孔 UIO-66-NH 壳不仅允许可见光被 CdS 纳米棒核吸收，而且还提供了丰富的催化活性位点以及 UIO-66-NH 壳和 CdS 纳米棒核之间的紧密异质结界面。利用这一特性，与原始的 UIO-66-NH 和 CdS 纳米棒相比，核壳复合材料在光催化降解有机染料（包括孔雀石绿（MG）和甲基橙（MO））方面表现出了更高的太阳能驱动光催化性能，并且在经过四次循环后仍具有优异的光稳定性。此外，CdS@UIO-66-NH 的光电化学性能可以通过紫外-可见光谱、Mott-Schottky 图和光电流来测量。CdS@UIO-66-NH 显著增强的光催化活性可归因于高比表面积、分子尺度上的紧密相互作用以及形成 n-n 型一维异质结。更重要的是，核壳结构的 CdS@UIO-66-NH 可以促进光生界面电子-空穴对的有效分离和转移，并保护 CdS 纳米棒核免受光腐蚀。
