Bi2Ti2O7/Bi4Ti3O12 composite photocatalyst and preparation method thereof

A catalyst and composite light technology, applied in the field of photocatalysis, can solve the problems of large particles of bismuth titanate-based mixed crystal material, high photo-generated electron-hole recombination rate, and difficulty in efficient utilization of visible light, etc. High absorption capacity, beneficial to industrial application

Inactive Publication Date: 2017-09-08
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, limited by two major disadvantages: low utilization of visible light and high recombination rate of photogenerated electrons and holes, TiO 2 It is still difficult to achieve efficient use of vis

Method used

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  • Bi2Ti2O7/Bi4Ti3O12 composite photocatalyst and preparation method thereof
  • Bi2Ti2O7/Bi4Ti3O12 composite photocatalyst and preparation method thereof
  • Bi2Ti2O7/Bi4Ti3O12 composite photocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] Add 20 mL of glacial acetic acid solution to a 50 mL beaker, then add 0.8 g of bismuth nitrate, stir until dissolved, add 0.5 mL of acetylacetone and 0.5 mL of tetrabutyl titanate with a micro-injector, and mix the reactants evenly Afterwards, the solution was poured into an evaporating dish and evaporated at 180 °C for 10 h. The obtained powder was placed in a crucible and calcined at 650 °C for 2 h.

[0025] figure 1 For the XRD diffraction pattern of the prepared sample, the diffraction peaks in the figure are Bi 2 Ti 2 o 7 or Bi 4 Ti 3 o 12 Compared with the standard JCPDS card (32-0118, 21-1272), the characteristic diffraction peak can be identified as Bi with good crystallinity 2 Ti 2 o 7 / Bi 4 Ti 3 o 12 Powder, figure 2 It is the transmission electron micrograph of the prepared composite photocatalyst, the larger particle in the figure is Bi 4 Ti 3 o 12 Particles, smaller particles are Bi 2 Ti 2 o 7 , it can be seen from the figure that Bi 2 ...

Embodiment 2

[0028] Add 20 mL of glacial acetic acid solution to a 50 mL beaker, then add 0.6 g of bismuth nitrate, stir until dissolved by magnetic force, add 0.5 mL of acetylacetone and 0.5 mL of tetrabutyl titanate with a micro-injector, and mix the reactants evenly Afterwards, the solution was poured into an evaporating dish and evaporated at 140°C for 5 h. The obtained powder was placed in a crucible and calcined at 550 °C for 0.5 h.

Embodiment 3

[0030] Add 20 mL of glacial acetic acid solution to a 50 mL beaker, then add 0.8 g of bismuth nitrate, stir until dissolved, add 0.5 mL of acetylacetone and 0.5 mL of tetrabutyl titanate with a micro-injector, and mix the reactants evenly Afterwards, the solution was poured into an evaporating dish and evaporated at 140°C for 5h. The obtained powder was placed in a crucible and calcined at 600 °C for 1 h.

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Abstract

The invention belongs to the technical field of photocatalysis and relates to a Bi2Ti2O7/Bi4Ti3O12 composite photocatalyst and a preparation method thereof. Firstly, tetrabutyl titanate, acetylacetone and bismuth nitrate are measured and put in a beaker, and glacial acetic acid is added for stirring and dissolution; then the solution is poured into an evaporating dish and is put in a drying oven to prepare precursor power; the Bi2Ti2O7/Bi4Ti3O12 composite photocatalyst is obtained through calcination. The precursor power is prepared through a chemical solution dissolution method, a mixed crystal material is obtained through calcination, and the product has the advantages of being small in particle diameter, regular in morphology, high in visible light absorption capability, good in photocatalytic effect and the like. In addition, the reaction conditions are easy to control, the process and flow are simple and convenient, and the energy consumption is low.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis and relates to a Bi 2 Ti 2 o 7 / Bi 4 Ti 3 o 12 Composite photocatalyst and preparation method thereof, specifically relate to a kind of bismuth nitrate and tetrabutyl titanate as bismuth source and titanium source, prepare Bi by chemical solution decomposition method 2 Ti 2 o 7 / Bi 4 Ti 3 o 12 Method for composite photocatalysts. Background technique [0002] In recent years, visible light catalysis has attracted extensive attention due to its great potential in solar energy conversion and environmental purification. Since TiO 2 Having been found to be a potential photocatalytic semiconductor for applications in pollutant degradation and water splitting to produce hydrogen, scientists have tried various methods to improve its photocatalytic performance. However, limited by two major disadvantages: low utilization of visible light and high recombination rate of photogenerated el...

Claims

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Application Information

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IPC IPC(8): B01J23/18B01J35/02C02F1/30C02F101/38
CPCB01J23/002B01J23/18B01J35/004B01J35/023C02F1/30C02F2101/38C02F2305/10
Inventor 钱坤谢吉民夏莉魏巍姜志锋孙伟吕霞
Owner JIANGSU UNIV
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