Platinum-ion-doped titania (Pt/TiO2) nanoparticles with varied doping concentration were synthesized by sol-gel method, and characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), UV-Vis diffuse reflectance spectroscopy (UV-Vis) and photoluminescence (PL) spectroscopy. The photocatalytic reduction experiment of CO2 was carried out under UV/visible light irradiation. Results showed that the Pt/TiO2 nanoparticles were arranged closely and uniform-sized, the mean diameter was about 20 nm. CH4 was found to be the primary product for Pt/TiO2 catalysts. The 0.2wt% Pt/TiO2 catalyst showed the best photocatalytic activity with a maximum CH4 production rate of 66 μmol gcat−1?h−1 under UV light irradiation. The activity of 0.3wt%Pt/TiO2 catalyst was highest under visible light irradiation. This is attributed to the doping of Pt ion can effectively extend the spectral response from UV to visible area and slow the recombination of photogenerated electron-hole pairs.
WEN Zhi-Yong
,
ZHAN Zhi-gang
,
DENG Jian-hua
,
FENG Yong-xin
,
LEI Ze
,
XIONG Zhuo
,
ZHAO Yong-chun
,
ZHANG Jun-ying
. Photocatalytic Reduction of CO2 over Platinum-Ion-Doped Titania[J]. Advances in New and Renewable Energy, 2017
, 5(5)
: 352
-357
.
DOI: 10.3969/j.issn.2095-560X.2017.05.005
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