Method for preparing graphene-Nb-doped TiO<2> nanotube heterostructure photocatalyst
A photocatalyst and heterostructure technology, applied in the field of photocatalysis, can solve the problems of the photocatalytic efficiency that is difficult to reach the industrial application level, the photo-induced electron-hole recombination rate is high, and the photoresponse range is narrow, and the separation efficiency can be improved and enriched. Active sites, the effect of increasing the specific surface area
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Embodiment 1
[0058] 0.18 mg of NbCl 5 Dissolve in 40ml of isopropanol and add 10ml of acetylacetone. 6 mM tetrabutyl titanate was added to the above solution, and the solution was continuously stirred at room temperature until a transparent solution was obtained, then transferred to a 100 ml reaction kettle, and kept at 200° C. for 12 hours. The obtained precipitate was washed 3 times with ethanol, dried, and then calcined at 400 °C for 1 h to obtain Nb-doped TiO 2 particles. 0.1 g graphene oxide and 1 g Nb-doped TiO 2 The powder was sonicated in deionized water for 2 h to achieve uniform dispersion, and 22 g of NaOH was added. The mixture was transferred to a reactor and kept at 120°C for 24h. The resulting precipitate was washed with 0.1M HCl to pH 2, stirred for 12 h, washed with deionized water until neutral, dried, and annealed at 400 °C for 1 h under a nitrogen atmosphere to obtain graphene-Nb doped TiO 2 Nanotube composite samples.
[0059] The photocatalytic performance of th...
Embodiment 2
[0068] First, 5.46 mg of NbCl 5 Dissolve in 40ml of isopropanol and add 10ml of acetylacetone. 6 mM tetrabutyl titanate was added to the above solution, and the solution was continuously stirred at room temperature until a transparent solution was obtained, which was transferred to a reaction kettle and kept at 200° C. for 12 hours. The obtained precipitate was washed with ethanol, dried, and calcined at 300 °C for 2 h to obtain Nb-doped TiO 2 particles. 0.1 g graphene oxide and 1 g Nb-doped TiO 2 The powder was sonicated in deionized water for 2 h to achieve uniform dispersion, and 22 g of NaOH was added. The mixture was transferred to a reactor and kept at 120°C for 24h. The resulting precipitate was washed with 1M HCl solution, stirred for 12 h, washed with deionized water, and dried to obtain graphene-Nb doped TiO 2 Nanotube composite powder. Using the same photocatalytic degradation conditions as in Example 1 to test the catalytic performance of the sample, when the...
Embodiment 3
[0070] First, 1.09 mg of NbCl 5 Dissolve in 40ml of isopropanol and add 10ml of acetylacetone. 6 mM tetrabutyl titanate was added to the above solution, and the solution was continuously stirred at room temperature until a transparent solution was obtained, which was transferred to a reaction kettle and kept at 200° C. for 12 hours. The obtained precipitate was washed with ethanol, dried, and calcined at 500 °C for 2 h to obtain Nb-doped TiO 2 particles. 0.1 g graphene oxide and 10 g Nb-doped TiO 2 The powder was sonicated in deionized water for 2 h to achieve uniform dispersion, and 22 g of NaOH was added. The mixture was transferred to a reactor and kept at 120°C for 24h. The resulting precipitate was washed with 1M HCl solution, stirred for 12 h, washed with deionized water, and dried to obtain graphene-Nb doped TiO 2 Nanotube composite powder. The same photocatalytic degradation conditions as in Example 1 were used to test the catalytic performance of the sample. Whe...
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