Composite semiconductor photocatalyst and application thereof

A compound semiconductor and photocatalyst technology, applied in the field of photocatalytic materials, can solve problems such as ineffective effects, and achieve the effects of improving dispersion, reducing particle size, and reducing agglomeration

Inactive Publication Date: 2014-04-23
高楠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods of CdS modification mainly include: ① supporting noble metals; ② (element or ion) doping modification; ③ carrier loading (such as CdS loaded on molecular sieves), etc., but the effect after modification is not obvious.

Method used

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  • Composite semiconductor photocatalyst and application thereof
  • Composite semiconductor photocatalyst and application thereof
  • Composite semiconductor photocatalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Tetraethyl titanate and mercaptobutanol were mixed at a mass ratio of 33:67, reacted at 70°C for 5 h, and distilled under reduced pressure (temperature 40°C, pressure -0.1 Mpa) to remove ethanol to obtain tetramercaptobutanol titanate ( titanium dioxide precursor); mix tetramercaptobutanol titanate, anhydrous cadmium acetate, and absolute ethanol at a mass ratio of 20:41.6:38.4, react at 30°C for 2 h, and remove ethanol by vacuum distillation (temperature 40°C, Pressure -0.1 Mpa) to obtain the precursor solution.

[0027] The precursor solution, polyethylene glycol and absolute ethanol were mixed according to the mass ratio of 29.5: 0.1: 70.4, stirred and reacted at 20 rpm at 25 °C for 1 h, and the ethanol was removed by vacuum distillation (temperature 40 °C, pressure -0.1 Mpa), Get the gel.

[0028] The gel was treated under nitrogen protection: calcined at 200 °C for 3 h, at 300 °C for 3 h, at 400 °C for 3 h, and at 480 °C for 3 h. The gel is treated under the prot...

Embodiment 2

[0031] Mix tetraethyl titanate and mercaptobutanol at a mass percentage of 33:90, react at 80°C for 7 h, and remove ethanol by vacuum distillation (temperature 40°C, pressure -0.1 Mpa) to obtain tetramercaptobutanol titanate (Titanium dioxide precursor); mix tetramercaptobutanol titanate, anhydrous cadmium acetate and absolute ethanol at a mass ratio of 34:2:64, react at 40°C for 3 h, and remove ethanol by vacuum distillation (temperature 50°C , pressure -0.09 Mpa), to obtain the precursor solution;

[0032] The precursor solution, polyethylene glycol and absolute ethanol were mixed according to the mass ratio of 29.5: 0.2: 70.3, stirred and reacted at 40 rpm at 30 °C for 2 h, and the ethanol was removed by vacuum distillation (temperature 50 °C, pressure -0.09 Mpa) , to obtain a gel.

[0033] The gel was sequentially processed as follows under the protection of nitrogen: calcined at 200 °C for 5 h, calcined at 300 °C for 5 h, calcined at 400 °C for 5 h, and calcined at 480 °...

Embodiment 3

[0035] Mix tetraethyl titanate and mercaptobutanol at a mass ratio of 33:1, react at 85°C for 8 h, and remove ethanol by vacuum distillation (temperature 40°C, pressure -0.1 Mpa) to obtain tetramercaptobutanol titanate (Titanium dioxide precursor); mix tetramercaptobutanol titanate, anhydrous cadmium acetate and absolute ethanol at a mass ratio of 34:3:63, react at 50°C for 4 h, and remove ethanol by vacuum distillation (temperature 60°C , pressure -0.08 Mpa), to obtain the precursor solution;

[0036] The precursor solution, polyethylene glycol and absolute ethanol were mixed according to the mass ratio of 29.5: 0.3: 70.2, stirred and reacted at 60 rpm at 35 °C for 3 h, and the ethanol was removed by vacuum distillation (temperature 60 °C, pressure -0.08 Mpa) , to obtain a gel.

[0037] The gel was sequentially processed as follows under the protection of nitrogen: calcined at 200 °C for 10 h, calcined at 300 °C for 10 h, calcined at 400 °C for 10 h, and calcined at 480 °C f...

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Abstract

The invention aims at providing a composite semiconductor photocatalyst and an application thereof and relates to the field of photocatalytic materials. The photocatalyst is prepared by adopting the following method which comprises the following steps: preparing a precursor solution; mixing the precursor solution, a dispersing agent and a solvent, stirring and reacting for 0.5-5h at the temperature of 20-50 DEG C, and removing the solvent to obtain gel; firstly, treating the gel under the protection of nitrogen, then grinding, carrying out acid washing and water washing, and drying to obtain the composite semiconductor photocatalyst. The invention also provides the application of the composite semiconductor photocatalyst in the aspect of degrading organic pollutants and making hydrogen by water decomposition. The composite semiconductor photocatalyst has the advantages that the transferring distance between CdS and TiO2 is shortened, the photocorrosion rate of the surface of the CdS is reduced, not only can the dispersing effect of the CdS on the surface of the TiO2 be improved, but also the service life of the CdS is prolonged, and simultaneously the photocatalytic activity of the CdS is improved.

Description

technical field [0001] The invention relates to the field of photocatalytic materials, in particular to composite semiconductor photocatalysts and applications thereof. Background technique [0002] With the increasing scarcity of fossil energy such as oil, coal, and natural gas, the development of clean, low-cost, and renewable energy has become a research hotspot. Solar energy is an inexhaustible renewable and clean energy source, and the use of solar energy for photocatalytic hydrogen production has always been one of the research hotspots in the field of photocatalysis. [0003] A photocatalyst is a semiconductor material that converts solar energy into chemical energy. Researchers have studied the basis of photocatalytic performance of many semiconductor photocatalysts, such as TiO2, Cu 2 S, ZnS, NiFe2O4, CdS, Bi 2 S 3 , CoFeO4, CoO / CdS and CdS / TiO 2 Wait. Among many photocatalysts, CdS and TiO2 have attracted much attention due to their unique advantages. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04A62D3/17C01B3/04
CPCY02E60/36
Inventor 余旺旺卢南
Owner 高楠
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