期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 28, 期 38, 页码 53340-53352出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-021-14442-z
关键词
KIT-6; Mesoporous TiO2; TiO2; KIT-6 nanocomposite; Methyl blue; Parametric study; UV-light photocatalysis
资金
- Higher Education Commission of Pakistan (HEC) under Technology Development Fund project [TDF02-011]
In this study, titania/silica nanocomposite and mesoporous TiO2 photocatalysts were developed by using KIT-6 template via a sol-gel approach, characterized with high surface area, a greater number of accessible active sites, and enhanced light-harvesting capability. The m-TiO2 photocatalysts showed superior photocatalytic degradation efficiency compared to commercial TiO2 under UV light irradiations, attributed to the synergistic effect of anatase phase and greater accessibility of active sites. Additionally, m-TiO2 exhibited excellent recyclability with negligible loss of activity performance.
In this study, titania/silica nanocomposite and mesoporous TiO2 (m-TiO2) photocatalysts are developed by KIT-6 template via a sol-gel approach. The synthesized photocatalysts are characterized by XRD, EDX, SEM, Raman, PL, and UV-vis DRS analysis techniques. The as-synthesized series revealed a high surface area, smaller size, a greater number of accessible active sites, and enhanced light-harvesting capability. The m-TiO2 photocatalysts' charge recombination capability was curiously inferior to the rest of as-synthesized TiO2/KIT-6 nanocomposite materials. The band-gap of as-synthesized materials were suitable for their activity in UV light irradiations. It was pragmatic that the photocatalytic degradation efficiency of m-TiO2 photocatalysts was superior as compared to that of commercial TiO2 photocatalyst under UV light irradiations, owing to the synergistic outcome of the anatase phase and a greater number of accessible active-sites availability as a result of high surface area. Moreover, the m-TiO2 was critically evaluated by investigating various parameters affecting the photocatalytic degradation reaction of MB including the effect of irradiation time, pH, catalyst dosage, and dye concentration. The m-TiO2, 45wt% composite material and commercial-TiO2 exhibited 99.27, 91.20, and 84.67% degradation of methyl blue in 50 min, respectively. Finally, the m-TiO2 exhibited excellent recyclability with negligible loss of activity performance.
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