期刊
APPLIED SURFACE SCIENCE
卷 458, 期 -, 页码 546-554出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.07.130
关键词
Hybrid porous structure; Photocatalysis; Water vapor adsorption; Humidity effect
类别
资金
- Bogazici University Research Fund [BAP 17B05D5/13141]
TiO2 photocatalyst and Cu-BTC metal organic framework were successfully coupled via sol-gel method to form a hybrid porous nanocomposite (TiO2-hybrid-PNC). X-ray diffraction (XRD) results revealed the intense characteristic TiO2 anatase peaks. Surface area (BET) measurements showed type IV adsorption isotherm with the formation of a mesoporous structure for TiO2-hybrid-PNC. Scanning electron microscopy elemental analysis-mapping images (SEM-EDX) and X-ray photoelectron spectra (XPS) confirmed the existence of TiO2 nanoparticles in the hybrid porous structure. UV-Vis diffuse reflectance (UV-Vis DRS) absorption profile of TiO2-hybrid-PNC had impacts from both TiO2 and Cu-BTC. The lower photoluminescence (PL) intensity of TiO2-hybrid-PNC possessed an efficient charge separation and inhibited electron-hole recombination compared to the Cu-BTC. Dark absorption capacities and photoactivities of Cu-BTC and TiO2-hybrid-PNC were discussed in terms of electronic interactions using methyl orange (MO) as probe molecule. Effect of humidity on the dark abilities and photocatalytic performances of Cu-BTC and TiO2-hybrid-PNC was investigated after their exposure to 40%, 67% and 84% relative humidity (RH) values. According to XRD and SEM analysis, structural features of TiO2-hybrid-PNC were preserved under humid conditions. Photocatalytic efficiency of TiO2-hybrid-PNC enhanced with increments in RH percentages owing to the formation of more hydroxyl radicals. TiO2-hybrid-PNC (84% RH) revealed a higher rate constant than that of TiO2-hybrid-PNC based on pseudo-first order kinetics and Langmuir-Hinshelwood model. Durabilities of TiO2-hybrid-PNC and TiO2-hybrid-PNC (84% RH) were also confirmed after four cycling experiments.
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