Document Details

Document Type : Thesis 
Document Title :
PHOTOCATALYTIC REDUCTION OF CO2 PRESENT IN WATER TO METHANOL USING NANOSIZED SEMICONDUCTORS
الاختزال الضوئي التحفيزي لثاني أكسيد الكربون الموجود بالماء الى ميثانول باستخدام أشباه الموصلات نانونية الحجم
 
Subject : Faculty of Marine Sciences 
Document Language : Arabic 
Abstract : Development of an efficient method to convert CO2 to fuel using renewable energy could replace crude oil without increasing CO2 emission and provide high-density energy storage reservoir similar to liquid fuel or batteries. In this study, an attempt has made to develop a photocatalyst, Cu-doped C/TiO2, which is capable of reducing CO2 into a useful fuel, which can help in lowering the global warming and energy crisis simultaneously. Photocatalytic reduction of carbon dioxide into methanol has been investigated in distilled water, sea water, and polluted seawater by using Cu-loaded carbon-modified titanium oxide (Cu-C/TiO2) nanoparticles under irradiation of UV and natural sunlight. Cu-C/TiO2 nanoparticles were prepared by sonicated sol–gel method. The synthesized photocatalyst exhibited maximum catalytic activity at the optimum dosage of 1.0 g L-1 of Cu-C/TiO2 having 3 wt% Cu content, giving maximum methanol yields of 2593 and 885 µmol g-1 after 5 h of illumination under UV and natural sunlight, respectively in the distilled water medium. The observed yield of methanol in seawater was 2885 and 940 µmol g-1 after 5 h of illumination under UV and natural sunlight, respectively. The polluted seawater showing the yield depending on its background hydrographic parameters. We assessed two types of polluted seawater system, the observed yield was to be 2910 and 990 µmol g-1 after 5 h of illumination under UV and natural sunlight respectively in system 1 and the corresponding yield in system 2 was 2250 and 910 µmol g-1 after 5 h of illumination. The results indicated that the methanol yield produced by Cu-C/TiO2 was much higher than those of carbon-modified titanium oxide (C/TiO2) and Degussa (P25-TiO2). This improvement was attributed to the reduced optical bandgap energy by C-modification, hindered electron-hole recombination by Cu-loading and the enhanced catalytic activity and selectivity of Cu for the reduction of CO2 specifically to methanol. 
Supervisor : Dr. Yasser A. Shaban 
Thesis Type : Doctorate Thesis 
Publishing Year : 1440 AH
2018 AD 
Added Date : Tuesday, December 11, 2018 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
يسار نيليوت كافيلKavil, Yasar NelliyotResearcherDoctorate 

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