Synthesis of efficient silica supported TiO2/Ag2O heterostructured catalyst with enhanced photocatalytic performance

Applied Surface Science 410

Sabtu, 12 Mei 2018 10:11 | Sudah dibaca 781 kali

We develop the n-type TiO2 coated on SiO2 support abbreviated as SiO2/TiO2 (ST) followed by deposition of p-type Ag2O nanoparticles outside for the purpose of photocatalytic degradation of organic pollutants. Different composite catalysts were prepare with changing the amount AgNO3 (such as 0%, 5%, 10%, 20%, and 30%) and the composites were abbreviated as ST, STA-5, STA-10, STA-20, and STA-30, respectively. The composite catalysts were characterized with different techniques and tested for Rhodamine B (RhB) dye degradation undder UV and visible light. Among the composite catalysts, the degradation efficiency of STA-20 was the highes and ite degraded about 99% within 40 min under UV light-irradiation. However, the ST, STA-5, STA-10, and STA-30 composite catalysts could degrade about 21%, 47%, 58%, and 75% od the dye, respectively. Furthermore, the STA-5, STA-10, STA-20, and STA-30 composites were also tested and about 39%, 47%, 57%, and 42% of the dye, respectively, was degraded under visible light source. Hence, the formation of p-n junction heterostructure between n-type TiO2 and p-type Ag2O could enhance the degradatioin of RhB in both UV and visible light irradiation. It could be also potentially applicable photocatalyst for environtmental remediation.

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