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Preparation method of bismuth oxyhalide/ titanium dioxide composite photocatalyst

A technology of titanium dioxide and bismuth oxyhalide is applied in the field of preparation of new photocatalytic materials, which can solve the problems of easy deactivation and low performance of photocatalytic materials.

Inactive Publication Date: 2013-12-25
NO 63971 TROOPS PLA
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to aim at traditional TiO 2 Insufficient catalytic performance, based on the principle of semiconductor heterojunction, choose TiO 2 BiOX-like semiconductors with matching energy bands provide a preparation method and application of a new composite titanium-based photocatalyst, which solves the defects of low performance and easy deactivation of existing photocatalytic materials

Method used

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  • Preparation method of bismuth oxyhalide/ titanium dioxide composite photocatalyst
  • Preparation method of bismuth oxyhalide/ titanium dioxide composite photocatalyst
  • Preparation method of bismuth oxyhalide/ titanium dioxide composite photocatalyst

Examples

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example 1

[0017] Bismuth oxyhalide / titanium dioxide composite photocatalyst for degradation of benzene. The gas-phase degradation reaction of organic pollutants is carried out on a continuous reaction device, using benzene (purge generation) as a simulated reactant, the flow rate is set to 20ml / min, and the concentration is adjusted to 200ppm. The loading amount of the catalyst in the quartz reactor is about 0.85g, and the light source is Porphyra PLS-XE300C (installed with a 420nm ultraviolet filter), and the distance between the lamp port and the reactor is fixed at about 10cm. Reactants and products were monitored online by gas chromatography (HP4890, Porapak R packed column, TCD, FID). Turn on the light after the adsorption is saturated, and automatically inject samples every 30 minutes to analyze organic pollutants and product CO 2 The concentration was calibrated by external standard method. The result is as figure 2 Shown, TiO 2 The visible light photocatalytic efficiency is...

example 2

[0019] Bismuth oxyhalide / titanium dioxide composite photocatalyst for degradation of ethylene, acetone and toluene. The specific experimental procedure is as described in Example 1. The simulated organic matter was successively replaced by ethylene, acetone and toluene, and the concentrations were all adjusted to 200 ppm. The result is as image 3 As shown, the four catalysts all showed high degradation ability to acetone and toluene, but the degradation to ethylene was not ideal. This is because, although the molecular structure of ethylene is the simplest and the penetration is strong, the adsorption amount on the catalyst is very small. Experiments have found that its dark adsorption speed is very fast, basically reaching saturation in 2 hours. In this case, the reactant and the catalyst cannot be fully contacted, and the reaction effect is naturally greatly reduced. In contrast, acetone has a simple structure and strong polarity, and is easier to combine with catalytic m...

example 3

[0021] Activity stability of bismuth oxyhalide / titania composite photocatalysts. Catalyst deactivation generally occurs in photocatalytic reactions. The main reasons are the shedding of loads and the deposition of intermediate products. Traditional organic photosensitization (RhB) and inorganic photosensitization (CdS), although can significantly improve TiO 2 The ability to respond to visible light, but the dopant itself is extremely unstable, prone to photocorrosion and loss of activity; on the other hand, due to its own surface characteristics, some catalysts are very easy to attach intermediate products during the reaction, resulting in the occupation of active sites . In the experiment, 10h was set as a cycle, and a total of 5 cycles of cyclic photoreaction were carried out. Depend on Figure 4 It can be seen that from the beginning of the reaction, TiO 2In the process of continuous deactivation, the degradation rate is only 5% after 30 hours, and at this time the dop...

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Abstract

The invention relates to a preparation method and application of a novel photocatalysis material. On the basis of the action principle of semiconductor heterojunction, bismuth oxyhalide and titanium dioxide are composited to obtain a novel titanium based photocatalysis material with the characteristics of high catalytic activity, wide applicability and good stability. The preparation method adopted by the invention is simple and efficient and is easy to implement, and the use amount of the bismuth oxyhalide is less and is about 1-3%, therefore no increase of overmuch cost may be caused. The photocatalysis material obtained by the reaction is a porous nano particle with larger specific surface area, good dispersibility and high degree of crystallinity. In addition, the photocatalytic activity of the bismuth oxyhalide / titanium dioxide composite photocatalyst is very excellent, and either under ultraviolet or visible light irradiation, the bismuth oxyhalide / titanium dioxide composite photocatalyst can show high degradation performance both on gas phase and liquid phase organic matters.

Description

technical field [0001] The invention discloses a preparation method of a novel photocatalytic material, which has a semiconductor heterogeneous structure, belongs to the photocatalytic technology, and can be applied in the fields of air treatment, water pollution treatment and the like. Background technique [0002] With the rapid development of modern society and the growing strength of science and technology industry, and the progress of civilization, the problems of energy shortage and environmental pollution have gradually emerged, and have even become the biggest obstacles to human development. Photocatalytic technology came into being under this background. Its low price and wide applicability have attracted wide attention in the industry. But with TiO 2 The traditional photocatalytic materials represented by the photocatalyst have generally low photon quantum efficiency and light energy utilization rate, which is the biggest bottleneck restricting their industrial a...

Claims

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Application Information

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IPC IPC(8): B01J27/135B01D53/86B01D53/72
Inventor 王磊王志军史喜成王东辉员汝胜
Owner NO 63971 TROOPS PLA
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