The TiO2/CNT microspherical composite
were prepared by a one-pot spray-drying process followed by subsequent
heat treatment, which is a modification from our previous work.23 (link) Specifically, the Ti precursor solution was
prepared by dispersing titanium ethoxide (2.24 g, Sigma Aldrich) in
ethanol (50 mL) with magnetic stirring. The CNTs solutions were prepared
by dispersing the as-received MWCNTs (0.1 g, Carbon Nano-material
Technology Co., South Korea) in ethanol (50 mL) with sonication for
1 h. The CNT solutions were mixed with the Ti precursor solution under
vigorous stirring, followed by the addition of deionized water (50
mL). Hydrolysis and condensation reactions of titanium ethoxide started
immediately upon the addition of water. Then, the solution was spray-dried
at 220 °C using a Buchi Mini spray dryer (Buchi Labortechnik
AG, Switzerland). Finally, the spray-dried products were annealed
at 450 °C for 3 h under an Ar atmosphere with a heating rate
of 5 min–1.
were prepared by a one-pot spray-drying process followed by subsequent
heat treatment, which is a modification from our previous work.23 (link) Specifically, the Ti precursor solution was
prepared by dispersing titanium ethoxide (2.24 g, Sigma Aldrich) in
ethanol (50 mL) with magnetic stirring. The CNTs solutions were prepared
by dispersing the as-received MWCNTs (0.1 g, Carbon Nano-material
Technology Co., South Korea) in ethanol (50 mL) with sonication for
1 h. The CNT solutions were mixed with the Ti precursor solution under
vigorous stirring, followed by the addition of deionized water (50
mL). Hydrolysis and condensation reactions of titanium ethoxide started
immediately upon the addition of water. Then, the solution was spray-dried
at 220 °C using a Buchi Mini spray dryer (Buchi Labortechnik
AG, Switzerland). Finally, the spray-dried products were annealed
at 450 °C for 3 h under an Ar atmosphere with a heating rate
of 5 min–1.