ao9b04076_si_001.pdf (1.05 MB)
Electrospun Ag-TiO2 Nanofibers for Photocatalytic Glucose Conversion to High-Value Chemicals
journal contribution
posted on 2020-03-11, 08:34 authored by Kamonchanok Roongraung, Surawut Chuangchote, Navadol Laosiripojana, Takashi SagawaTiO2 nanofibers were fabricated by combination of sol–gel
and electrospinning techniques. Ag-doped TiO2 nanofibers
with different Ag contents were prepared by two different methods
(in situ electrospinning or wetness impregnation
of Ag on TiO2 nanofibers) and heat treated at 500 °C
for 2 h under an air or N2 atmosphere. The obtained catalysts
were characterized by field emission scanning electron microscopy,
X-ray diffraction, photoluminescence, and N2 adsorption
analyzed by the Brunauer–Emmett–Teller (BET) method.
Photocatalytic glucose conversions with electrospun TiO2 and Ag-doped TiO2 nanofibers for production of high-value
products were carried out. From different doping methods, the results
indicated that 1 wt % Ag-TiO2 nanofibers prepared by an in situ method with calcination under N2 achieved
the highest glucose conversion (85.49%). From several Ag loading contents
(i.e., 0, 1, 2, and 4 wt %) in Ag-doped TiO2 nanofibers,
the nanofibers exhibited different glucose conversions [in order of
2 wt % (99.65%) > 1 wt % (85.49%) > 4 wt % (77.72%) > 0 wt
% (29.64%)]. Arabinose, xylitol, gluconic acid, and formic acid were
found as the high-value chemicals with the photocatalytic reaction
of TiO2 and Ag-doped TiO2 nanofibers under UVA
irradiation. Product yields of each converted chemicals from different
photocatalysts from different Ag loading contents showed relatively
same trends with the glucose conversion. From all results, it can
be concluded that the good characteristics of 2 wt % Ag-TiO2 nanofibers such as the smallest anatase crystallite size (8.25 nm)
and the highest specific surface area (SBET = 53.69 m2/g) promoted the highest photocatalytic activity.
Additionally, TiO2 and Ag-doped TiO2 nanofibers
exhibited higher photocatalytic performance for glucose conversion
than commercial TiO2 (P25) and synthesized TiO2 nanoparticles. Finally, Ag-doped TiO2 nanofibers showed
recycling ability with high photocatalytic glucose conversion after
four-time use.
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Keywords
UVAglucose conversionN 2 atmosphereBETTiO 2 nanofibersTiO 2 nanoparticlesHigh-Value Chemicals TiO 2 nanofiberswtelectrospun TiO 2field emission scanning electron microscopyphotocatalytic glucose conversionPhotocatalytic glucose conversionsTiO 2Ag loading contentsElectrospun Ag-TiO 2 NanofibersN 2 adsorptionPhotocatalytic Glucose ConversionAg-doped TiO 2 nanofibers
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