Journal of Inorganic Materials ›› 2018, Vol. 33 ›› Issue (8): 839-844.doi: 10.15541/jim20170540

• Orginal Article • Previous Articles     Next Articles

Photocatalytic Reduction of Carbon Dioxide to Methanol over N-doped TiO2 Nanofibers under Visible Irradiation

Yin-Huan KE(), Min ZENG, Hong JIANG, Chun-Rong XIONG()   

  1. Special Glass Key Lab of Hainan Province, Skate Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China
  • Received:2017-11-14 Revised:2018-01-14 Online:2018-08-28 Published:2018-07-17
  • About author:KE Yin-Huan. E-mail: 947127452@qq.com

Abstract:

TiO2 nanofibers with a diameter size of 8-10 nm were prepared on the surface of the mesoporous SiO2 spheres through a vapor-phase growth method. And nitrogen doped TiO2 (N-TiO2) nanofibers were also successfully fabricated in the same way. The N atoms replaced the oxygen sites in the lattices of TiO2. The N-TiO2 nanofibers exhibited a highly catalytic activity under visible irradiation. XPS, UPS, XRD, SEM, TEM, UV-Vis, and PL were used to analyze and characterize the nanofibers. The annealed nanofibers were composed of highly crystalline anatase phase. Nitrogen doping narrowed band gap of the TiO2 nanofibers and enhanced absorption of the visible light. Meanwhile, photo-generated electrons over the N-TiO2 nanofibers exhibited more reductive potential than those over the TiO2 nanofibers. Thus, methanol yield was remarkably improved in CO2 photocatalytic reduction. Upon irradiation of 300 W Xe lamp for 2 h, methanol yield was 493.4 μmol∙g-1∙h-1 over the N-doped TiO2 nanofibers, and the corresponding turnover frequency (TOF) was 0.089 h-1. Comparatively, methanol yield reached 695.1 μmol∙g-1∙h-1 for N-TiO2 with a TOF of 0.125 h-1, which enhanced by 40.1% and 40.4%, respectioely.

Key words: CO2, visible light, methanol, TiO2 nanofiber

CLC Number: 

  • TQ174