Photocatalytic reduction of CO2 with SiC recovered from silicon sludge wastes

In the present study, silicon carbide (SiC) recovered from silicon sludge wastes is used as catalysts for photocatalytic reduction of CO ₂. 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...

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Bibliographic Details
Published in:Environmental technology 2015-12, Vol.36 (23), p.2987-2990
Main Authors: Yang, T.-C, Chang, F.-C, Peng, C.-Y, Wang, H. Paul, Wei, Y.-L
Format: Article
Language:English
Subjects:
acetic acids
carbon dioxide
catalysts
crystallites
formic acids
hydrogen
lighting
NMR
Nuclear magnetic resonance
nuclear magnetic resonance spectroscopy
photocatalytic reduction of CO
recovery of SiC
Scanning electron microscopy
silicon
silicon carbide
Sludge
X-ray diffraction
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Summary:In the present study, silicon carbide (SiC) recovered from silicon sludge wastes is used as catalysts for photocatalytic reduction of CO ₂. 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 C ₁–C ₂ chemicals from photocatalytic reduction of CO ₂, hydrogen is provided by simultaneous photocatalytic splitting of H ₂O. 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.
ISSN:1479-487X
0959-3330
1479-487X
DOI:10.1080/09593330.2014.960474