Abstract
Nanotube titanic acid (NTA) network film has a porous structure and large BET surface area, which lead them to possessing high utilization of the incident light and strong adsorption ability. We used NTA as the precursor to fabricate a TiO2/ SrTiO3 heterojunction film by the hydrothermal method. In the process of the reaction, part of NTA reacted with SrCl2 to form SrTiO3 nanocubes, and the remainder dehydrated to transform to the rutile TiO2. The ratio of TiO2 and SrTiO3 varied with the hydrothermal reaction time. SEM and TEM images indicated that SrTiO3 nanocubes dispersed uniformly on TiO2 film, and the particle size and crystallinity of SrTiO3 nanocubes increased with the reaction time prolonging. The TiO2/SrTiO3 heterojunction obtained by 1 h showed the best activity for CO2 photoreduction, where the mole ratio of TiO2 and SrTiO3 was 4:1. And the photo-conversion efficiency of CO2 to CH4 improved remarkably after the foreign electron traps of Pt and Pd nanoparticles were loaded. The highest photocatalytic production rate of CH4 reached 20.83 ppm/h cm2. In addition, the selectivity of photoreduction product of CO2 was also increased apparently when Pd acted as the cocatalyst on TiO2/SrTiO3 heterojunction film.
Highlights
Nowadays, the fossil fuels are still the main energy resource for our society
From the above X-Ray powder diffraction (XRD) and SEM result, we knew that TS1 was TiO2/SrTiO3 heterojunction films, and the main composition of TS2 and TS3 was SrTiO3. These results indicated that the TiO2/SrTiO3 heterojunction exhibited the best photocatalytic activity of CO2 photoreduction to CH4
In the basic reaction process, part of Nanotube titanic acid (NTA) reacted with SrCl2 to form SrTiO3 naocubes, and the residues transformed to rutile TiO2
Summary
The shortage of fossil fuels and the growing environmental concerns due to the emission of large amounts of CO2 during the combustion of fossil fuels have become the global problems. Conversion of CO2 into useful hydrocarbon fuels is a possible avenue to develop alternative fuels, and prevent the green house effect on the global temperature. The chemical conversion of CO2 into industrially beneficial compounds is advantageous in terms of green and sustainable chemistry because CO2 is an inexpensive, nontoxic and abundant C1 feedstock [1]. Catalytic conversion of CO2 to hydrocarbon fuels and chemicals have attracted much attention in recent years [2,3,4,5,6]. TiO2-based materials are the most common photocatalysts because of their many advantages.
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