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Date of Publication:2022-10-09

Journal:无机化学学报

Volume:34

Issue:12

Page Number:2153-2160

ISSN No.:1001-4861

Abstract:Mesoporous titanium dioxide (m-TiO2) was synthesized by using Titanium tetraisopropanolate (TTIP) as the raw material and cetyltrimethyl ammonium bromide (CTAB) as the template via sol-gel method. The effects of the synthesis temperature, the amount of H2O and template in the initial gel, as well as the calcination temperature on the photocatalytic hydrogen production activity of m-TiO2 were investigated. The results show that the structure of the m-TiO2 sample transferred from amorphous to anatase phase after calcined under 350 degrees C for 3 h. The crystallinity of the anatase phase increased with calcination temperature increasing and most of the anatase phase transferred to rutile phase after calcined above 550 degrees C. The sample which synthesized at 30 degrees C, with n(CTAB)/n(TiO2)=0.2 and n(H2O)/n(TiO2)=100, then calcined at 450 degrees C showed excellent photocatalytic activity of splitting water under UV irradiation. When the amount of catalyst was 0.4 g.L-1 and the methanol concentration was 20% (V/V), the hydrogen production rate of m-TiO2 reached as high as 170 mmol.g(-1).h(-1). A series of rGO/m-TiO2 samples with different amount of rGO were synthesized by using hydrothermal method. When w(GO)/w(TiO2) was 0.01, the hydrogen production rate of the sample was 241 mmol.g(-1)-h(-1) under UV light irradiation, and the energy conversion efficiency reached 7.4%, 42.3% higher than that of m-TiO2. Under visible light irradiation, its hydrogen production rate reached 9 mmmol.g(-1).h(-1).

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