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Here, hierarchically meso/nanoporous TiO 2 was successfully fabricated by a facile and efficient hydrolysis and calcination method using Ti(OC 4 H 9 ) 4 and K 2 S 2 O 8 as precursors. The hydrosol was firstly prepared by drop-wise adding ethanol dissolved Ti(OC 4 H 9 ) 4 solution into acetone dissolved K 2 S 2 O 8 solution under a vigorous stirring and heating condition. After being sufficiently hydrolyzed, the hydrosol was calcined to promote the crystallization of TiO 2 and successfully dope S and C on TiO 2 . The calcination temperature significantly affects the doping of S and C on TiO 2 , crystallization of TiO 2 , formation of hierarchically meso/nanoporous structure of TiO 2 and its light absorption capability. The S- and C-codoped TiO 2 exhibits high photocatalytic H 2 generation efficiency in a water/methanol sacrificial reagent system under the irradiation of UV light. The high photocatalytic efficiency is dependent on the comprehensively competing effects of the codoping of S and C, crystallization, specific surface area and light absorption capability. The S- and C-codoped TiO 2 calcined at 600 °C demonstrates the highest photocatalytic H 2 generation efficiency, which is ascribed to the balanced synergy of the abovementioned factors. |
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