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Visible light photocatalyst doped with modified titanium dioxide and preparation method thereof

A technology of titanium dioxide and photocatalyst, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of narrow light absorption wavelength range and high recombination rate of photogenerated carriers, so as to reduce the recombination rate , simple process, cheap and easy-to-obtain raw materials

Inactive Publication Date: 2017-07-28
SHANXI LANHUA HUAMING NANO MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to TiO 2 There are problems of narrow light absorption wavelength range and high recombination rate of photogenerated carriers, which limit its application.

Method used

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  • Visible light photocatalyst doped with modified titanium dioxide and preparation method thereof
  • Visible light photocatalyst doped with modified titanium dioxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) After crushing the rice bran into 200 mesh, weigh 0.1g of rice bran and immerse it in 5ml of 95wt% ethanol solution, and treat it with ultrasonic wave for 30 minutes. In the solution, after stirring well, slowly add 10ml tetraisopropyl titanate, stir and hydrolyze, and prepare TiO by adjusting pH=6 2 Sol.

[0036] (2) Add 0.5g of biomass ash (plant ash: seaweed ash mass ratio = 1:1) to the above TiO 2 sol, stirred at room temperature for 2 hours to obtain biomass ash-TiO 2 Sol mixture.

[0037] (3) Biomass ash-TiO 2 The sol mixture was placed at gradient temperatures of 80°C, 100°C, and 120°C, and dried for 1 hour in sequence to form a gel state.

[0038] (4) The above-mentioned gel was calcined at 250° C. for 4 h to obtain a modified titanium dioxide visible light photocatalyst.

Embodiment 2

[0040] (1) After crushing the rice bran into 200 mesh, weigh 0.1g of rice bran and immerse it in 5ml of 95wt% ethanol solution, and treat it with ultrasonic wave for 30 minutes. In the solution, after stirring well, slowly add 10ml tetraisopropyl titanate, stir and hydrolyze, and prepare TiO by adjusting pH=6 2 Sol.

[0041] (2) Add 0.5g of biomass ash (plant ash: seaweed ash mass ratio = 1:5) to the above TiO 2 sol, stirred at room temperature for 2 hours to obtain biomass ash-TiO 2 Sol mixture.

[0042] (3) Biomass ash-TiO 2 The sol mixture was placed at gradient temperatures of 80°C, 100°C, and 120°C, and dried for 1 hour in sequence to form a gel state.

[0043] (4) The above gel was calcined at 300° C. for 4 h to obtain a modified titanium dioxide visible light photocatalyst.

Embodiment 3

[0045](1) After crushing the rice bran into 100 mesh, weigh 0.1g of rice bran and soak it in 5ml of 95%wt ethanol solution, and treat it with ultrasonic wave for 30 minutes. In the hydrochloric acid solution, after stirring well, slowly add 10ml tetraisopropyl titanate, stir and hydrolyze, and prepare TiO by adjusting pH=6 2 Sol.

[0046] (2) Add 0.5g of biomass ash (plant ash: seaweed ash mass ratio = 1:10) to the above TiO 2 sol, stirred at room temperature for 2 hours to obtain biomass ash-TiO 2 Sol mixture.

[0047] (3) Biomass ash-TiO 2 The sol mixture was placed at gradient temperatures of 80°C, 100°C, and 120°C, and dried for 1 hour in sequence to form a gel state.

[0048] (4) The above gel was calcined at 300° C. for 4 h to obtain a modified titanium dioxide visible light photocatalyst.

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Abstract

The invention discloses a visible light photocatalyst doped with modified titanium dioxide and a preparation method thereof. The preparation method comprises the following steps: hydrolyzing bran-doped titanium alkoxide to obtain sol and adding biomass ash to stir; drying the sol into gel; finally calcining the gel to obtain the visible light photocatalyst doped with the modified titanium dioxide. Bran is one of or more of rice bran, wheat bran, sorghum bran and bran coat, and has a particle size of 50-300 meshes. The biomass ash is a mixture of plant ash and seaweed ash of which the mass ratio is 1:(0.5-10). The preparation method disclosed by the invention has the benefits that raw materials are easy to obtain, the process is simple, and the industrial production can be realized; the prepared light photocatalyst has a good visible light photocatalytic degradation effect on organic pollutants.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a doped modified titanium dioxide visible light photocatalyst and a preparation method thereof. Background technique [0002] TiO 2 It is a typical photocatalyst with excellent physical and chemical properties such as non-toxic, cheap and easy to obtain, stable chemical properties and high photocatalytic activity. It is widely used in photocatalytic water splitting, photodegradation of pollutants, solar cells and other fields. Under normal temperature conditions, hydroxyl radicals OH, superoxide ions O 2 - , hydroperoxy·HO 2 etc. have strong redox active groups, which can directly degrade organic matter into CO 2 and H 2 Inorganic small molecules such as O. Due to TiO 2 There are problems of narrow light absorption wavelength range and high recombination rate of photogenerated carriers, which limit its application. Modifying it is the most effective way. ...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J21/18
CPCB01J21/063B01J21/18B01J35/39
Inventor 郭俊凌杨裕金陈庆华吴仲涛杨松伟程海江牛振宁
Owner SHANXI LANHUA HUAMING NANO MATERIALS
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