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Molecular sieve loaded BiOX photocatalyst, preparation method and application thereof

A supported catalyst, bismuth oxyhalide technology, applied in the field of photocatalysis, can solve problems such as small specific surface area, and achieve the effect of large specific surface area, which is conducive to large-scale promotion and inhibits agglomeration

Active Publication Date: 2010-02-24
FUZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a synthesis method for molecular sieve-supported bismuth oxyhalide photocatalysts. The present invention aims at the problems of large bismuth oxyhalide particles and small specific surface area. The particle-supported photocatalyst improves the activity of the catalyst to degrade gas-phase benzene, and the method has a simple preparation process and does not require complex and expensive equipment; the synthesis conditions are mild, the preparation process is non-toxic, and there is no secondary pollution, which is conducive to large-scale promotion

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  • Molecular sieve loaded BiOX photocatalyst, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Preparation of Bismuth Oxyfluoride Photocatalyst Supported by SBA-15 Molecular Sieve

[0029] Weigh 4.85 grams of bismuth nitrate and dissolve in 40 mL of ethylene glycol solution, then add 80 mL of ethanol, stir to dissolve, add 0.6 grams of SBA-15, ultrasonically disperse for 0.5 hours, and then stir the suspension for 24 hours; take 0.40 grams of Ammonium fluoride is dissolved in the mixed solution of 40mL ethylene glycol and ethanol, this solution is added dropwise to the above-mentioned suspension and mixed, the ammoniacal liquor diluted with ethanol (V ethanol / V strong ammonia water=10, the mass concentration of strong ammonia water is 25 -28%) to adjust the pH value to 7, and after 12 hours of magnetic stirring, the precipitate was repeatedly washed with deionized water, then put into a 60°C oven for drying, and the powder was roasted at 400°C for 2 hours to obtain a bismuth oxyfluoride-loaded catalyst.

Embodiment 2

[0031] Preparation of Bismuth Oxychloride Photocatalyst Supported by SBA-15 Molecular Sieve

[0032] Weigh 2.43 grams of bismuth nitrate and dissolve in 40 mL of ethylene glycol solution, dissolve 0.276 grams of ammonium chloride in 50 mL of ethanol, dissolve 6 grams of urea in 100 mL of ethanol solution, mix the above three solutions, and stir for 0.5 hours; take 1.2 Add one gram of SBA-15 powder into the above mixed solution, stir at room temperature for 24 hours, ultrasonically treat the obtained suspension for 4 hours, filter the obtained product, wash with deionized water to remove excess ions, and dry at 80°C to obtain Supported catalyst containing bismuth oxychloride.

[0033] According to the above steps, by changing the added amount of the carrier, supported catalysts with different ratios of Bi / Si were prepared respectively.

[0034] Changing the carrier, using ZSM-5 and HY molecular sieve as the carrier, the preparation method is the same as the above steps, and th...

Embodiment 3

[0036] Catalyst performance evaluation and physical property characterization results

[0037] The performance evaluation of the catalysts prepared in Examples 1 and 2 for catalytic oxidation of benzene was carried out in a continuous flow reactor. The catalyst is packed in the reaction tube, the catalyst dosage is 0.4g, the catalyst particle size is 50-70 mesh, the reaction gas flow rate is about 20mL / min, and the initial concentration of benzene is 230ppm. Using Agilent 6890D gas chromatograph to regularly analyze C6H6 and CO in the atmosphere 2 concentration, TCD and FID are detectors, the average conversion rate of benzene and the amount of carbon dioxide generated, the data are listed in Table 1 and Table 2 respectively; Table 3 is the specific surface area and crystallinity grain size. figure 1 is the XRD test result of BiOF and BiOF / SBA-15 (Bi / Si=1:1). The activity test results showed that the activity of bismuth oxyhalide to degrade benzene was significantly improve...

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Abstract

The invention provides a molecular sieve loaded BiOX photocatalyst, a preparation method and an application thereof, belonging to the technical field of photocatalysis. The catalyst is a loaded catalyst using one or more of SBA-15, ZSM-5 and HY as a carrier and BiOX as an active component. The preparation method comprises the following two steps: soaking a molecular sieve into an organic solutionof bismuth nitrate and ammonium fluoride or ammonium chloride; and adding a precipitating agent to prepare the loaded BiOX catalyst. The catalyst is used for removing gas phase organic matters. The molecular sieve is led into the catalyst to be used as a carrier, thereby increasing the specific surface area of the catalyst, reducing the grain size and obviously improving the benzene degradation activity by the catalyst; and the preparation method is simple and easy and is beneficial to mass generalization.

Description

technical field [0001] The invention relates to photocatalytic technology in environmental treatment, in particular to a preparation method of a supported bismuth oxyhalide photocatalyst. Background technique [0002] Semiconductor photocatalytic oxidation technology can use light energy to oxidize and decompose pollutants at room temperature, and has broad application prospects in the treatment of environmental pollution. Commonly used titanium dioxide photocatalysts have low photon quantum efficiency, low solar energy utilization, and easy deactivation, which restrict the practical application of photocatalytic technology. The main ways to solve this problem are to modify the structure and composition of titanium dioxide, or to develop new photocatalysts other than titanium dioxide. [0003] Bismuth-containing compounds are cheap and environmentally friendly, and have recently become a research hotspot in the field of new photocatalyst development. Bismuth oxychloride is...

Claims

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Application Information

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IPC IPC(8): B01J29/03B01J29/48B01J29/16B01J29/80B01J35/10A62D3/17A62D101/20
Inventor 付贤智苏文悦黄应兴王建戴文新李朝晖陈旬王绪绪
Owner FUZHOU UNIVERSITY
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