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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

Inactive Publication Date: 2018-12-21
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But TiO 2 Some of its own defects, such as wide band gap (about 3.2eV), narrow photoresponse range (excited TiO 2 The light wavelength of the valence band electrons is ≤387nm, which only accounts for about 3% of the total solar energy), and the high photo-induced electron-hole recombination rate makes it difficult for its photocatalytic efficiency to reach the industrial application level.

Method used

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  • Method for preparing graphene-Nb-doped TiO&lt;2&gt; nanotube heterostructure photocatalyst
  • Method for preparing graphene-Nb-doped TiO&lt;2&gt; nanotube heterostructure photocatalyst
  • Method for preparing graphene-Nb-doped TiO&lt;2&gt; nanotube heterostructure photocatalyst

Examples

Experimental program
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Effect test

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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Abstract

The invention discloses a method for preparing a graphene-Nb-doped TiO<2> nanotube heterostructure photocatalyst. The photocatalyst is responded in a visible light region, and belongs to the technicalfield of photocatalysis. The preparation method comprises the steps: by using isopropanol as a solvent, and tetrabutyl titanate as a precursor, and preparing a supported nano-titanium dioxide catalyst modified on the niobium surface by using a solvothermal method; and then coupling with graphene oxide in an alkaline hydrothermal process to form composite material of the titanium dioxide nanotubemodified on the niobium surface on uniformly supporting reduced graphene sheet, that is the graphene-Nb-doped TiO<2> nanotube heterostructure photocatalyst. In the invention, the photocatalyst, prepared by doping TiO<2>, structuring a tubular structure and the co-modification strategy of composite graphene, has a wide visible light spectral response range, rich surface active sites and high chargeseparation ability. The photocatalytic degradation efficiency reaches 95.2%, which has good industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, in particular to a Nb-doped TiO that can respond in the visible light region 2 Nanotube-graphene heterostructure photocatalyst and preparation method thereof. Background technique [0002] Photocatalytic technology utilizes the activation characteristics of semiconductor materials under light irradiation conditions, which can be used to catalyze the decomposition of water to produce hydrogen and reduce CO 2 Production of hydrocarbon fuels, degradation of various pollutants in water and air, etc., has the advantages of mild conditions, energy saving and high efficiency, so it has become one of the effective ways to solve the current environmental pollution and energy crisis, and has important practical significance. [0003] TiO 2 With high catalytic activity, good thermodynamic stability, and rich sources, it has become a semiconductor photocatalyst that has attracted much attention. Bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/20B01J35/10C02F1/30C02F101/36C02F101/38
CPCC02F1/30B01J23/20C02F2305/10C02F2101/36C02F2101/38C02F2101/40B01J35/61B01J35/39
Inventor 赵洪力晏伟静牛孝友王立坤邱茹蒙付晨杨静凯
Owner YANSHAN UNIV
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