title: Photocatalytic reduction of CO₂with SiC recovered from silicon sludge wastes.
abstract: In the present study, silicon carbide (SiC) recovered from silicon sludge wastes is used as catalysts for photocatalytic reduction of CO₂. By X-ray diffraction, it is clear that the main components in the silicon sludge wastes are silicon and SiC. The grain size of the SiC separated from the sludge waste is in the range of 10-20 µm in diameter (observed by scanning electron microscopy). By solid state nuclear magnetic resonance, it is found that α-SiC is the main crystallite in the purified SiC. The α-SiC has the band-gap of 3.0 eV. To yield C₁-C₂chemicals from photocatalytic reduction of CO₂, hydrogen is provided by simultaneous photocatalytic splitting of H₂O. Under the light (253-2000 nm) illumination, 12.03 and 1.22 µmol/h g cat of formic and acetic acids, respectively, can be yielded.
authors.affiliation: a Department of Environmental Engineering , National Cheng Kung University , Tainan 70101 , Taiwan.
authors.forename: T-C
authors.initials: TC
authors.lastname: Yang
authors.affiliation: a Department of Environmental Engineering , National Cheng Kung University , Tainan 70101 , Taiwan.|b The Experimental Forest , National Taiwan University , Nan-Tou 55750 , Taiwan.
authors.forename: F-C
authors.initials: FC
authors.lastname: Chang
authors.affiliation: a Department of Environmental Engineering , National Cheng Kung University , Tainan 70101 , Taiwan.
authors.forename: C-Y
authors.initials: CY
authors.lastname: Peng
authors.affiliation: a Department of Environmental Engineering , National Cheng Kung University , Tainan 70101 , Taiwan.
authors.forename: H Paul
authors.initials: HP
authors.lastname: Wang
authors.affiliation: c Department of Environmental Science and Engineering , Tunghai University , Taichung 407 , Taiwan.
authors.forename: Y-L
authors.initials: YL
authors.lastname: Wei
mesh_terms: D019342:Acetic Acid / Q000737:chemistry; D000397:Air Pollution / Q000517:prevention & control; D017554:Carbon Compounds, Inorganic / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry*; D002384:Catalysis; D005561:Formates / Q000737:chemistry; D006859:Hydrogen / Q000737:chemistry; D007220:Industrial Waste; D008027:Light; D010084:Oxidation-Reduction; D059027:Recycling / Q000379:methods; D012722:Sewage; D012825:Silicon; D017655:Silicon Compounds / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D017554:Carbon Compounds, Inorganic; D005561:Formates; D007220:Industrial Waste; D012722:Sewage; D017655:Silicon Compounds; D014867:Water; C030544:formic acid; D002245:Carbon Dioxide; D006859:Hydrogen; D019342:Acetic Acid; C022088:silicon carbide; D012825:Silicon
keywords: formic acids; photocatalytic reduction of CO2; recovery of SiC