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Preparation method of lanthanum and boron codoped titanium dioxide visible-light-induced photocatalyst

A technology of titanium dioxide and photocatalyst, which is applied in the field of photocatalysis, can solve the problems of low solar energy utilization rate and low photon quantum efficiency, achieve the effect of low cost, simple synthesis process operation, and broaden the application field

Inactive Publication Date: 2013-04-17
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the invention is to solve TiO 2 For the problems of low solar energy utilization rate and low photon quantum efficiency, a TiO with high visible light activity is provided 2 Preparation method of nanomaterials, lanthanum-boron co-doped TiO prepared by improved sol-gel method 2

Method used

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  • Preparation method of lanthanum and boron codoped titanium dioxide visible-light-induced photocatalyst
  • Preparation method of lanthanum and boron codoped titanium dioxide visible-light-induced photocatalyst
  • Preparation method of lanthanum and boron codoped titanium dioxide visible-light-induced photocatalyst

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Embodiment 1

[0032] (1) Add 3.4 mL of n-butyl titanate dropwise to 20 mL of ethanol at room temperature, and stir for 30 min to obtain solution A;

[0033] (2) Mix 35mL absolute ethanol, 3.6mL H 2 O and 0.1 mL HNO 3 Mix and stir to obtain solution B;

[0034] (3) Add solution B dropwise to solution A, stir for 4 hours, and let it stand for a period of time to obtain a gel;

[0035] (4) The obtained gel was dried at 60° C., ground, and calcined at a high temperature of 400° C. for 3 hours to obtain an undoped titanium dioxide photocatalyst.

Embodiment 2

[0037] (1) Add 3.4 mL of n-butyl titanate dropwise to 20 mL of ethanol at room temperature, and stir for 30 min to obtain solution A;

[0038] (2) Dissolve 0.0186g of boric acid in 35mL of absolute ethanol, and continue to add 3.6mL of H 2 O and 0.1 mL HNO 3 , to obtain solution B;

[0039] (3) Add solution B dropwise to solution A, stir, and let stand to obtain a gel;

[0040] (4) The obtained gel was dried at 60° C., ground, and calcined at a high temperature of 400° C. for 3 hours to obtain a boron-doped titanium dioxide photocatalyst.

Embodiment 3

[0042] (1) Add 3.4 mL of n-butyl titanate dropwise to 20 mL of ethanol at room temperature, and stir for 30 min to obtain solution A;

[0043] (2) Weigh 0.0186g boric acid and 0.0065g La(NO 3 ) 3 ·nH 2 O was dissolved in 35 mL absolute ethanol, and continued to add 3.6 mL H 2 O and 0.1 mL HNO 3 , to obtain solution B;

[0044] (3) Add solution B dropwise to solution A, stir for 4 hours, and let it stand for a period of time to obtain a gel;

[0045] (4) The obtained gel was dried at 60° C., ground, and calcined at a high temperature of 400° C. for 3 hours to obtain a lanthanum-boron co-doped titanium dioxide photocatalyst.

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Abstract

The invention relates to a preparation method of a lanthanum and boron codoped titanium dioxide visible-light-induced photocatalyst. The lanthanum and boron codoped titanium dioxide photocatalyst is prepared from lanthanum nitrate used as a lanthanum source and boric acid used as a boron source. The absorptivity of the catalyst in a visible light region is enhanced; and the catalyst has superior visible light activity in comparison with a pure titanium dioxide photocatalyst. When 20mg.L<-1> orange II is degraded under visible light when being illuminated for 5 hours in case of an optimal doping amount (La:Ti is 1at%, and B:Ti is 3at%), the degradation rate is up to 93%. The invention has the characteristics that the method is simple and easy to implement, the raw materials are accessible, the cost is low and the doped elements are easy to control. Through the synergistic action of the doped elements lanthanum and boron, the spectral utilization range of nano titanium dioxide is widened, and the photocatalytic efficiency is improved.

Description

technical field [0001] The invention relates to a preparation method of a lanthanum and boron co-doped titanium dioxide visible light catalyst, which belongs to the technical field of photocatalysis. Background technique [0002] TiO 2 It is a new type of inorganic functional material. Due to its advantages of high efficiency, low price, non-toxicity and good chemical stability, it is widely used in air purification, sewage treatment, antibacterial and other environmental protection fields. It is now known as "environmental catalyst". ". However, due to TiO 2 The band gap is wide (3.2eV), and it can only be excited by ultraviolet light to produce photocatalysis, and the utilization of sunlight is very limited, accounting for only 5%. In addition, photogenerated electrons and holes are easy to recombine in the bulk phase and surface of the catalyst, which makes the photoquantum efficiency of the catalyst low. Therefore TiO 2 The industrial promotion of TiO has been restr...

Claims

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Application Information

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IPC IPC(8): B01J23/10
Inventor 张金龙兰茜田宝柱方文章
Owner EAST CHINA UNIV OF SCI & TECH
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