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Copper porphyrin titanium dioxide composite photocatalyst and preparation method thereof

A technology of titanium dioxide and composite light, applied in the field of photocatalysis, can solve the problems of low utilization rate of solar energy, achieve good degradation effect, overcome steric hindrance and high activity

Inactive Publication Date: 2010-11-10
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although TiO 2 It has been widely used as a photocatalyst, but there are still some problems: TiO 2 The forbidden band is wide (3.2eV) and only the ultraviolet light of λ<387.5nm can be used
The content of ultraviolet rays in the sun is less than 5%, which makes the utilization of solar energy very low

Method used

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  • Copper porphyrin titanium dioxide composite photocatalyst and preparation method thereof
  • Copper porphyrin titanium dioxide composite photocatalyst and preparation method thereof
  • Copper porphyrin titanium dioxide composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In a 100mL single-necked bottle, 0.01g of 5,10,15-triphenyl-20-[4-(2-(3-pentadecyl-8-enyl)phenoxy)ethoxy]benzene Base copper porphyrin was dissolved in 30mL chloroform solution, and 1g TiO was added 2 (Pure anatase type), stirred at room temperature (25°C) for 24 hours. The chloroform was evaporated to dryness under reduced pressure, and the prepared copper porphyrin-titanium dioxide composite photocatalyst was collected and ground into a powder in an agate mortar, and dried in an oven at 80° C. for 30 minutes to obtain the copper porphyrin-titanium dioxide composite photocatalyst.

[0024] figure 1 For the SEM photo of the prepared copper porphyrin-titanium dioxide composite photocatalyst, it can be seen that the particle size of the titanium dioxide composite photocatalyst particle is about 100~300nm, and its fixed-point EDS analysis spectrum shows that copper porphyrin has been attached to the titanium dioxide surface ( figure 2 ).

[0025] image 3 The ultravio...

Embodiment 2

[0027] The effect of the photocatalytic material will be illustrated below by comparing the degradation percentages of the copper porphyrin-titanium dioxide composite photocatalyst of the present invention to model pollutants per unit time under different light sources by way of comparative examples.

[0028] Copper porphyrin titanium dioxide composite photocatalyst of the present invention, under 250W mercury lamp and 500W xenon lamp light source (plus 400nm filter) respectively, and take 4-nitrophenol solution as target solution, and pure anatase type TiO 2 Compared with P25, the target solution was placed in a 150mL beaker, the beaker was placed vertically with the light source, and the center of the beaker was kept at 40 cm from the light source. Finally, the degradation percentage was calculated according to the change in absorbance of the 4-nitrophenol solution before and after light source irradiation (see figure 2 ).

[0029] Figure 4 It is a composite photocatalyst...

Embodiment 3

[0038] Under the light source of 250W mercury lamp and 500W xenon lamp (with 400nm filter), choose rhodamine B as the target solution, put the target solution in a 250mL beaker, place the beaker vertically with the light source, keep the center of the beaker at 40 cm from the light source, and finally Changes in the absorbance of rhodamine B solution before and after calculating the degradation percentage ( Figure 5 ).

[0039] Figure 5 20mg copper porphyrin sensitized titanium dioxide composite catalyst, P25 or pure anatase TiO 2 Under different light sources, degrade 100mL of Rhodamine B solution with a concentration of 20mg / L, the curve of solution absorbance versus time, wherein,

[0040] (a) The curve is pure anatase TiO under the irradiation of 250W high-pressure mercury lamp 2 Degradation curve;

[0041] (b) The curve is pure anatase TiO under the irradiation of 500W xenon lamp (with 400nm filter) 2 Degradation curve;

[0042] (c) The curve is the degradation cu...

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Abstract

The invention discloses a copper porphyrin titanium dioxide composite photocatalyst and a preparation method thereof. The specific technical scheme is that: copper porphyrin as shown by the following structure is adsorbed on the surface of a pure anatase type titanium dioxide particle, and the mass ratio of the copper porphyrin to the titanium dioxide is (0.1-1):100. The preparation method comprises the following steps of: according to the mass ratio of the copper porphyrin to the pure anatase type titanium dioxide of (0.1-1):100, dissolving the copper porphyrin by using trichloromethane or dichloromethane; adding the titanium dioxide into the copper porphyrin, and fully stirring the mixture; performing reduced pressure distillation to remove a solvent; collecting the copper porphyrin titanium dioxide composite photocatalyst; and grinding and drying the copper porphyrin titanium dioxide composite photocatalyst. The copper porphyrin titanium dioxide composite photocatalyst can be synthesized simply, has stable properties, high activity and reusability, and can degrade stable organic matters.

Description

technical field [0001] The invention relates to a copper porphyrin-titanium dioxide composite photocatalyst and a preparation method thereof, belonging to the technical field of photocatalysis. Background technique [0002] With the acceleration of industrialization and the expansion of the scope of human life, the problem of environmental pollution has become increasingly serious. The consumption and discharge of a large number of chemical raw materials have made the surrounding environment of people's lives worse. Among them, the pollution of nitrophenols and dye wastewater is the most serious in industry. Nitrophenols are important chemical raw materials, widely used in explosives, paints, pharmaceuticals, petroleum, leather, paper, disinfectants, etc., especially coking plants, gas plants, oil refineries, petroleum plants, etc. produce a large amount of phenols Wastewater not only hinders the growth and reproduction of aquatic organisms, but also endangers the growth of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38C02F1/30C02F1/32C02F101/38C02F103/30
CPCY02W10/37
Inventor 李珺吕向菲王晨段明玥刘惊宙刘瑞平
Owner NORTHWEST UNIV(CN)
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