Anjugam Vandarkuzhali S Anbu, Pugazhenthiran N, Mangalaraja R V, Sathishkumar P, Viswanathan B, Anandan S
National Centre for Catalysis Research, Indian Institute of Technology Madras, Chennai 600 036, India.
Advanced Ceramics and Nanotechnology Laboratory, Department of Materials Engineering, Faculty of Engineering, University of Concepcion, Concepcion 4070409, Chile.
ACS Omega. 2018 Aug 23;3(8):9834-9845. doi: 10.1021/acsomega.8b01322. eCollection 2018 Aug 31.
Hierarchical mesoporous TiO was synthesized via a solvothermal technique. The sonochemical method was adopted to decorate plasmonic nanoparticles (NPs) (Ag, Au) on the pores of mesoporous TiO. The crystallinity, structure, and morphology were determined to understand the physicochemical nature of the nanocomposites. The catalytic efficiency of the plasmonic nanocatalysts was tested for the azo dyes (congo red, methyl orange, acid orange 10, and remazol red) under solar and visible light irradiations. The generation of hydroxyl radicals was also studied using terephthalic acid as a probe molecule. An attempt was made to understand the influence of size, work function and Fermi level of the metal NPs toward the efficiency of the photocatalyst. The efficiency of the nanocomposites was found to be in the order of P25 < mesoporous TiO < mesoporous Ag-TiO < mesoporous Au-TiO nanospheres under both direct solar light and visible light irradiation. The results indicated that the adsorption of dye, anatase phase, and surface plasmon resonance of NPs favored the effective degradation of dyes in aqueous solution. Further, the efficiency of the catalyst was also tested for xanthene (rose bengal), rhodamine (rhodamine B, rhodamine 6G), and thiazine (methylene blue) dyes. Both TiO and NPs (Ag & Au) possess a huge potential as an eco-friendly photocatalyst for wastewater treatment.
通过溶剂热技术合成了分级介孔TiO。采用声化学方法在介孔TiO的孔上修饰等离子体纳米颗粒（NPs）（Ag、Au）。通过测定结晶度、结构和形态来了解纳米复合材料的物理化学性质。测试了等离子体纳米催化剂在太阳光和可见光照射下对偶氮染料（刚果红、甲基橙、酸性橙10和雷马素红）的催化效率。还使用对苯二甲酸作为探针分子研究了羟基自由基的产生。试图了解金属NPs的尺寸、功函数和费米能级对光催化剂效率的影响。发现在直射太阳光和可见光照射下，纳米复合材料的效率顺序为P25 < 介孔TiO < 介孔Ag-TiO < 介孔Au-TiO纳米球。结果表明，染料的吸附、锐钛矿相和NPs的表面等离子体共振有利于水溶液中染料的有效降解。此外，还测试了催化剂对呫吨染料（孟加拉玫瑰红）、罗丹明染料（罗丹明B、罗丹明6G）和噻嗪染料（亚甲基蓝）的效率。TiO和NPs（Ag和Au）作为用于废水处理的环保型光催化剂都具有巨大潜力。
