Ibrahim Islam, Belessiotis George V, Arfanis Michalis K, Athanasekou Chrysoula, Philippopoulos Athanassios I, Mitsopoulou Christiana A, Romanos George Em, Falaras Polycarpos
Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research (NCSR) "Demokritos", 15341 Athens, Greece.
Department of Chemistry, Zografou, National and Kapodistrian University of Athens, 15784 Athens, Greece.
Materials (Basel). 2020 Oct 20;13(20):4665. doi: 10.3390/ma13204665.
Novel VO bifunctional photocatalysts were prepared following a wet chemical process with the addition of anionic or non-ionic surfactants into the precursor solution and further heating under reflux. Detailed characterization and investigation of the relevant light-matter interactions proved that surfactants addition had a strong impact on the morphology, while also affecting the crystallinity, the optoelectronic properties, and the surface chemistry of the novel photocatalysts. The most efficient photocatalyst (T80) was based on tween 80, a surface-active agent employed for the first time in the synthesis of vanadium oxide materials. T80 presented crystalline nature without structural defects, which are usually centers of e - h recombination. This material also exhibited small crystal size, high porosity, and short migration paths for the charge carriers, enabling their effective separation during photocatalysis. Under UV light illumination, T80 was capable to reduce hexavalent chromium to trivalent up to 70% and showed high yields in degrading methylene blue azo-dye and tetracycline antibiotic water pollutants. This remarkably high bifunctional performance defines T80 as a promising and capable photocatalytic material for both advanced oxidation and reduction processes (AOPs-ARPs).
采用湿化学法制备了新型VO双功能光催化剂，即在前驱体溶液中加入阴离子或非离子表面活性剂，然后进一步回流加热。对相关光-物质相互作用的详细表征和研究表明，添加表面活性剂对新型光催化剂的形貌有很大影响，同时也影响其结晶度、光电性能和表面化学性质。最有效的光催化剂（T80）基于吐温80，这是一种首次用于合成氧化钒材料的表面活性剂。T80呈现出无结构缺陷的晶体性质，而结构缺陷通常是电子-空穴复合的中心。这种材料还具有小晶体尺寸、高孔隙率和电荷载流子的短迁移路径，使其在光催化过程中能够有效分离。在紫外光照射下，T80能够将六价铬还原为三价铬，还原率高达70%，并且在降解亚甲基蓝偶氮染料和四环素抗生素水污染物方面表现出高产率。这种非常高的双功能性能将T80定义为一种有前途且有能力用于高级氧化和还原过程（AOPs-ARPs）的光催化材料。
