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Flaky titanium dioxide/bismuth oxybromide composite photocatalyst and preparation method thereof

A technology of titanium dioxide and bismuth oxybromide, which is applied in the field of photocatalysis, can solve the problem of high hole-electron recombination rate, and achieve the effects of simple preparation process, excellent photocatalytic performance, and excellent photocatalytic activity

Inactive Publication Date: 2015-07-22
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the present invention provides a composite photocatalyst of sheet-like titanium dioxide / bismuth oxybromide. The present invention uses mercaptoacetic acid as a linking agent to uniformly deposit bismuth oxybromide on the surface of titanium dioxide nanosheets, which is beneficial to improve Its photocatalytic properties, high utilization rate of sunlight and effectively solve the problem of high recombination rate of hole-electron pairs, has potential application value in the field of catalysis

Method used

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  • Flaky titanium dioxide/bismuth oxybromide composite photocatalyst and preparation method thereof
  • Flaky titanium dioxide/bismuth oxybromide composite photocatalyst and preparation method thereof
  • Flaky titanium dioxide/bismuth oxybromide composite photocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] 1.1 Add 0.2mL tetrabutyl titanate to 25mL isopropanol, stir well to mix evenly, then slowly add 0.8mL inducer hydrofluoric acid, stir to obtain a uniform white emulsion, that is, the precursor solution ;

[0035] 1.2 Transfer the precursor solution to the reactor, react at 180°C for 20 h, centrifuge and wash after the reaction to obtain titanium dioxide nanosheets, figure 1 is the X-ray diffraction pattern of titanium dioxide nanosheets, figure 2 It is a scanning electron micrograph of the obtained titanium dioxide nanosheets. from figure 1 It can be seen that the obtained product is anatase phase titanium dioxide; from figure 2 It can be seen that the average size of the titanium dioxide nanosheets is 150nm × 100nm, and the shape is uniform;

[0036] 1.3 Add 0.02g of titanium dioxide nanosheets, 0.05g of KBr, and 0.004mmol of mercaptoacetic acid into deionized water, and disperse ultrasonically for 30 minutes to obtain a uniform and transparent solution;

[0037...

Embodiment 2

[0041] 2.1 The preparation method of titanium dioxide nanosheets is the same as in Example 1;

[0042] 2.2 Add 0.02g of titanium dioxide nanosheets, 0.0252g of KBr, and 0.002mmol of mercaptoacetic acid into deionized water, and disperse ultrasonically for 30 minutes to obtain a uniform and transparent solution;

[0043]2.3 Dissolve 0.0304g of bismuth nitrate in 20ml of ethylene glycol, stir, add the dissolved bismuth nitrate solution into the uniform transparent solution of titanium dioxide nanosheets, and fully stir at room temperature to obtain a uniform milky white emulsion;

[0044] 2.4 The milky white emulsion was left to stand at room temperature for 3 hours, and then centrifuged and washed to obtain a flaky titanium dioxide / bismuth oxybromide composite photocatalyst.

[0045] 2.5 The average thickness of the composite photocatalyst bismuth oxybromide deposited layer is 10 nm.

Embodiment 3

[0047] 3.1 The preparation method of titanium dioxide nanosheets is the same as in Example 1;

[0048] 3.2 Add 0.02g of titanium dioxide nanosheets, 0.0119g of KBr, and 0.001mmol of thioglycolic acid into deionized water, and ultrasonically disperse for 30 minutes to obtain a uniform and transparent solution;

[0049] 3.3 Dissolve 0.0202g of bismuth nitrate in 20ml of ethylene glycol, stir, add the dissolved bismuth nitrate solution into the uniform transparent solution of titanium dioxide nanosheets, and fully stir at room temperature to obtain a uniform milky white emulsion;

[0050] 3.4 The milky white emulsion was left to stand at room temperature for 3 hours, and then centrifuged and washed to obtain a flaky titanium dioxide / bismuth oxybromide composite photocatalyst.

[0051] 3.5 The average thickness of the composite photocatalyst bismuth oxybromide deposited layer is 8 nm.

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Abstract

The invention discloses a flaky titanium dioxide / bismuth oxybromide composite photocatalyst and a preparation method thereof. The composite photocatalyst is a heterogeneous composite material formed by depositing bismuth oxybromide on a titanium dioxide nanometer sheet. The preparation method comprises the following steps: dispersing the titanium dioxide nanometer sheet, thioglycollic acid, potassium bromide in deionized water in an ultrasonic manner, uniformly mixing to obtain a solution, and dissolving bismuth nitrate in ethylene glycol to obtain a solution; mixing the two solutions obtained in the former step to obtain a milky emulsion, stirring, leaving the emulsion to stand, and performing centrifugal separation and washing to obtain the composite photocatalyst. In the preparation process, through adjusting ratio of titanium dioxide to bismuth oxybromide, composite structures in different particle diameters can be obtained. The composite photocatalyst is simple in preparation technology; particularly, through thioglycollic acid, bismuth oxybromide can be uniformly distributed on the titanium dioxide (TiO2) sheet; the composite photocatalyst shows a more excellent photocatalytic activity compared with that of the titanium dioxide nanometer sheet under visible light, and has the potential practical application prospect of photocatalytic degration of organic pollutants through solar power light in the processing technology.

Description

technical field [0001] The invention relates to a sheet-like titanium dioxide / bismuth oxybromide composite photocatalyst and a preparation method thereof, belonging to the field of photocatalysis. Background technique [0002] In recent years, with the rapid development of the global industrialization process, the problem of environmental pollution has become increasingly prominent. Semiconductor photocatalytic oxidation technology has attracted much attention in the field of environmental governance due to its advantages of simple operation, mild reaction conditions, low energy consumption and less secondary pollution. Among many semiconductor photocatalysts, TiO 2 Because of its high chemical activity, strong oxidizing ability, non-toxicity and high stability, it has become one of the ideal photocatalyst materials. But TiO 2 is a wide bandgap semiconductor (anatase TiO 2 E g =3.2 e V), it can only absorb and utilize ultraviolet light with a wavelength of less than 38...

Claims

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Application Information

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IPC IPC(8): B01J27/135
Inventor 杨萍郑妍
Owner UNIV OF JINAN
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