title: Effect of photocatalytic reduction of carbon dioxide by N-Zr co-doped nano TiO2.
abstract: Modified sol-gel method was adopted to prepare TiO2, Zr-TiO2and N/Zr-TiO2composite catalyst. The as-synthesized photocatalysts were characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Brunner- Emmet- Teller measurement and UV-Vis diffuse reflectance spectroscopy. And the photocatalytic performance toward CO2reduction was evaluated under ultraviolet light. The catalyst particles were demonstrated in the nanometer level size. When N and Zr are co-doped, on the one hand, Ti4+can be replaced by Zr4+, which leads to lattice distortion and inhibits electron-hole recombination. On the other hand, N enters into TiO2lattice gap to form O-Ti-N bond structure, and partial Ti4+are reduced to Ti3+. Compared with pristine TiO2, the specific surface area and the band gap of N/Zr-TiO2were improved and reduced, respectively. The N and Zr synergistically contribute to the obviously strengthened absorption intensity in visible region, as well as significantly improved photocatalytic activity. In the gas phase reactor, when the calcination temperature was 550°C, 0.125N/0.25Zr-TiO2composite performed the highest photocatalytic activity UV irradiation for 8 h, and the corresponding CH4yield was 11.837 µmol/g, which was 87.8% higher than that of pristine TiO2. For the visible light, the CH4yield was 9.003 µmol/g after 8 h irradiation, which was 83.9% higher than that of pristine TiO2.
authors.affiliation: a School of Energy and Environmental Engineering , University of Science and Technology Beijing , Beijing , People's Republic of China.
authors.forename: Ru
authors.initials: R
authors.lastname: Zhang
authors.affiliation: a School of Energy and Environmental Engineering , University of Science and Technology Beijing , Beijing , People's Republic of China.|c Key Laboratory of Resource-Oriented Treatment of Industrial pollutants , Beijing , People's Republic of China.
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.affiliation: b School of Materials Science and Engineering , University of Science and Technology Beijing , Beijing , People's Republic of China.
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Kang
authors.affiliation: a School of Energy and Environmental Engineering , University of Science and Technology Beijing , Beijing , People's Republic of China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Li
authors.affiliation: a School of Energy and Environmental Engineering , University of Science and Technology Beijing , Beijing , People's Republic of China.
authors.forename: Huixian
authors.initials: H
authors.lastname: Pan
mesh_terms: D002245:Carbon Dioxide; D002384:Catalysis; D053768:Metal Nanoparticles; D014025:Titanium; D014961:X-Ray Diffraction
chemical_list: D002245:Carbon Dioxide; C009495:titanium dioxide; D014025:Titanium
keywords: CO2; N/Zr–TiO2 composite catalyst; TiO2; methane; photo-catalysis