Compound barium titanate photocatalyst and preparation method and application thereof

A composite barium titanate and photocatalyst technology, which is applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problem of ineffective use of visible light of sunlight, low utilization rate of sunlight, Reduce the photocatalytic efficiency of the catalyst and other issues

Active Publication Date: 2016-11-16
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, BaTiO 3 As a photocatalyst, there are two major defects: First, BaTiO 3 The band gap is 3.3eV, so that barium titanate can only respond to ultraviolet light, but cannot effectively use the visible part of sunlight, and the utilization rate of sunlight is low.
Second, electrons (e - ) and holes (h + ) are easy to recombine, reducing the photocatalytic efficiency of the catalyst

Method used

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  • Compound barium titanate photocatalyst and preparation method and application thereof
  • Compound barium titanate photocatalyst and preparation method and application thereof
  • Compound barium titanate photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 Preparation of composite barium titanate photocatalyst

[0021] (1) Composite barium titanate Ba 0.5 Mg 0.5 TiO 3 catalyst of light

[0022] Accurately weigh 0.2304g magnesium hydroxide, 0.6311g titanium dioxide and 1.2461g barium hydroxide octahydrate, put the weighed medicines into a microwave digestion tank, add 14.4mL distilled water, and ensure that the molar ratio of Ba:Sr:Ti is 0.5:0.5 :1. Then close the microwave digestion tank, place it in the microwave synthesizer, and ensure that the pressure is under 1.5MPa, and the microwave hydrothermal reaction was carried out for 30 minutes. After naturally cooling to room temperature, the precipitate was washed with distilled water several times to remove the amorphous catalyst in the precipitate. Then place in a centrifuge and run at medium speed. After centrifugation, the supernatant was removed, and the remaining material was dried in an oven at 105°C for 12 hours to obtain Ba 0.5 Mg 0.5 TiO 3 N...

Embodiment 2

[0029] Example 2 Application of composite barium titanate photocatalyst prepared under different synthesis conditions in degradation of organic pollutants

[0030] The degradation experiment was carried out with Rhodamine B (Rh B) as the target organic pollutant.

[0031] Degradation method: Adjust the concentration of Rhodamine B solution to 10mg / L, the dosage of catalyst to 2g / L, and the light power to 315W for 4 hours.

[0032] (1) The effect of composite barium titanate photocatalysts synthesized under different pressures on the degradation rate

[0033] The synthesis method of the composite barium titanate photocatalyst: the method is the same as in Example 1, the difference: the synthesis pressure is respectively 0.5MPa, 1.0MPa, and 1.5MPa. The degradation rate is shown in Table 1.

[0034] Table 1 The effect of different synthesis pressures on the degradation of Rhodamine B solution (554nm)

[0035]

[0036] Table 1 shows the effect of different microwave synthesi...

Embodiment 3

[0042] Example 3 Application of composite barium titanate photocatalyst in degradation of organic pollutants under different degradation conditions

[0043] The degradation experiment was carried out with Rhodamine B (Rh B) as the target organic pollutant.

[0044] Composite barium titanate photocatalyst: three photocatalysts prepared in Example 1 were used.

[0045] The degradation method is as follows: adjust the concentration of rhodamine B solution to 10mg / L, the dosage of catalyst to 2g / L, and the light power to 315W for 4 hours.

[0046] (1) The effect of different light conditions on the degradation rate

[0047] The composite barium titanate photocatalyst prepared in Example 1 was used to degrade under different light conditions, and the degradation rate was as shown in Table 3 and figure 2 shown.

[0048] table 3

[0049]

[0050] It can be seen from Table 3 that, compared with the stock solution, after 4 hours of irradiation of the rhodamine B solution alone ...

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Abstract

The invention relates to a compound barium titanate photocatalyst and a preparation method and application thereof. The molecular formula of the compound barium titanate photocatalyst is Ba0.5M0.5TiO3, wherein M represents Sr or Ca or Mg. The preparation method includes the following steps that Sr or Ca or Mg salt is weighed, titanium dioxide, barium hydroxide and water are added, a microwave hydrothermal reaction is carried out for 10-40 min in a microwave digestion tank at the pressure of 0.5-1.5 MPa, cooling, washing, centrifuging and drying are carried out, and the target product is obtained. According to the compound barium titanate photocatalyst and the preparation method and application thereof, the visible light response range of BaTiO3 is expanded, and electron and hole compounding is reduced, so that the utilization rate of BaTiO3 on solar energy is increased, and the visible light catalytic activity of BaTiO3 is improved. The compound barium titanate photocatalyst has a good photocatalytic effect under the action of visible light and has a high degradation rate on organic pollutants in water in combination with visible light irradiation.

Description

technical field [0001] The invention belongs to the field of photocatalysts, and in particular relates to a composite barium titanate photocatalyst prepared by a microwave hydrothermal method and its application in catalytically degrading organic pollutants in water under visible light. Background technique [0002] Barium titanate (BaTiO 3 ) band gap and TiO 2 Similar to, it is a kind of semiconductor material, which has the characteristics of stable chemical properties, high catalytic activity, low cost, and non-toxicity, so it can be used as a good photocatalyst. It can not only convert light energy into chemical energy, but also realize photocatalytic oxidation of various refractory biodegradable toxic organic pollutants in water and air, and the final product of degradation is CO 2 , H 2 O and other inorganic ions. [0003] BaTiO 3 can absorb ultraviolet light and generate electrons (e - ) and holes (h + ), h + Oxidizes organic pollutants, e - Can with O 2 The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/02C02F1/30C02F101/30
CPCB01J23/002B01J23/02B01J2523/00C02F1/30C02F2101/30C02F2101/308C02F2305/10B01J2523/22B01J2523/25B01J2523/47B01J2523/23B01J2523/24Y02W10/37
Inventor 张朝红郭庆王君袁天新刘逸伦孙意忱郜炜
Owner LIAONING UNIVERSITY
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