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제116회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Photocatalytic conversion of CO2 to hydrocarbon fuel using carbon and nitrogen co-doped sodium titanate nanotubes

2015년 9월 3일 11시 25분 21초
ENVR.P-553 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (목요일) 11:00~12:30
저자 및
Abdul Razzaq, 인수일1,*
대구경북과학기술원(DGIST) 에너지시스템공학, Korea
1대구경북과학기술원(DGIST) 에너지 시스템 공학 전공, Korea
The excessive release of CO2 into atmosphere is considered as a major cause of challenging issues of global warming, climate changes and environmental pollution. One effective approach to normalize atmospheric CO2 is its conversion to hydrocarbon fuels via solar-spectrum photocatalysis. Among photocatalysts, Titania (TiO2) or Ti-based materials have been intensively studied due to their abundant availability, nontoxicity, corrosion resistance, and chemical stability.However the relatively wide bandgap of TiO2, approximately 3.2 eV, which is responsible for its excellent corrosion stability but with limitation of its absorption to UV wavelengths, some 4% of the terrestrial solar-spectrum energy. Numerous approaches have been used for reducing the TiO2 bandgap as a means of absorbing, and utilizing, a greater portion of the solar spectrum energy, including metal ion implantation, non-metal doping and synthesis of low bandgap hybrid nanomaterials etc. Among the variety of available nanostructures layered-titanate nanotubes (TNTs), innovated by Kasuga et al, with advantages of the material architecture include large surface areas, improved adsorption capacity, moderate photocatalytic activity, and improved thermal and chemical stability. Motivated by the unique qualities of the layered-TNTs and the potential for simultaneous co-doping of the materials as a means to obtain improved photocatalytic properties we have investigated herein different samples of C,N-TNT with varied dopant concentrations their application under simulated solar light investigated for the photocatalytic conversion of CO2 and water vapors to CH4. The C,N-TNT sample with an intermediate doping concentration yields the maximum methane yield of 9.75 ?mol /g h. We concluded the key factors contributing in the improvement of photocatalyst performance includes light absorption, surface area and protonation effects in TNT influencing CO2 adsorption sites and photogenerated electrons recombination centers.