Dendrite silver phosphate visible light catalyst and preparation method thereof

A catalyst and visible light technology, applied in the field of photocatalysis, can solve the problems of few preparation methods, difficult control of morphology and performance, and achieve the effects of simple process, excellent photocatalytic performance and mild conditions.

Inactive Publication Date: 2012-10-03
WUHAN UNIV OF TECH
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Problems solved by technology

[0003] However, because its morphology and properties are not eas

Method used

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  • Dendrite silver phosphate visible light catalyst and preparation method thereof
  • Dendrite silver phosphate visible light catalyst and preparation method thereof
  • Dendrite silver phosphate visible light catalyst and preparation method thereof

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preparation example Construction

[0027] The preparation method step of dendritic silver phosphate visible light catalyst of the present invention is as follows:

[0028] Weigh a certain amount of AgAc respectively, place them in beakers and dissolve them with deionized water respectively, and prepare AgAc solutions with a concentration of 0.03M-0.3M. Prepare 6 mL of sodium deoxycholate with a concentration of 0.036M-0.36M, and slowly inject sodium deoxycholate into the completely dissolved AgAc solution under the condition of magnetic stirring (30 ml of AgAc solution with a concentration of 0.3M, add 0.36M concentration of deoxygenated Sodium cholate (6 ml) was magnetically stirred at room temperature for 2 h. Add 4mL of distilled water to the above solution, add 1-10 drops of 85wt% phosphoric acid, and magnetically stir for 1 hour to obtain a precipitate. The precipitate was collected by centrifugation, washed three times with deionized water and ethanol, and then dried at 60°C. That is, a dendritic silver...

Embodiment 1

[0033] Weigh the AgAc, put it in a beaker and dissolve it with deionized water respectively to prepare 30mL AgAc solution with a concentration of 0.03M. Prepare 6 mL of 0.036M sodium deoxycholate, slowly inject it into the completely dissolved AgAc solution under the condition of magnetic stirring, and magnetically stir for 2 hours at room temperature. Add 4 mL of distilled water to the above solution, add 1 drop of 85 wt% phosphoric acid, and stir magnetically for 1 h. The precipitate was collected by centrifugation, washed several times with deionized water and alcohol, and dried at 60°C to obtain a sample.

[0034] figure 1 For the X-ray diffraction pattern of obtained sample, the diffraction peaks of all samples are consistent with simple cubic crystal Ag 3 PO 4 The standard map (JCPDS No. 06-0505) corresponds exactly. Moreover, there are no diffraction peaks of other crystals in the diffraction pattern, indicating that the prepared material is pure Ag 3 PO 4 crystal...

Embodiment 2

[0038] Visible light catalytic performance evaluation of dendritic silver phosphate prepared by the method of the present invention.

[0039] The visible light catalytic performance of the dendritic silver phosphate prepared by the method of the invention is evaluated by using samples to degrade organic matter under simulated visible light. The photocatalytic experiment was carried out in a photochemical reactor (including Xe lamp 350W, optical filter, magnetic stirrer). Weigh 0.05g of prepared sample, add liquid dye solution (10 -5 M RhB (rhodamine B), 30mg / L MO (methyl orange)), magnetically stirred for 30min under dark conditions to reach adsorption-desorption equilibrium. A 350W Xe lamp plus a filter (λ>420nm) was used as a simulated light source, and 3ml of the suspension was taken at regular intervals, and the supernatant was taken after centrifugation (6000rpm, 5min). The absorbance of the dye solution was measured using a UV-2550 ultraviolet-visible spectromete...

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Abstract

The invention provides a dendritic silver phosphate visible light catalyst and a preparation method thereof. The appearance of silver phosphate is adjusted with sodium deoxycholate, so as to form the dendritic silver phosphate which has an efficient visible light catalytic performance and is suitable for degrading organic pollutants under visible light. The invention has the advantages that the preparation process is simple; the condition is mild; and the dendritic silver phosphate visible light catalyst is favorable for application to mass production practice.

Description

technical field [0001] The invention relates to the field of photocatalysis, in particular to a dendritic silver phosphate visible light catalyst and a preparation method thereof. Background technique [0002] Ag 3 PO 4 It is a visible light catalyst with better performance, which is mainly determined by its own structure. Ag 3 PO 4 The unique indirect band gap, the strong oxidation of photoexcited holes in the valence band, and the higher electron transfer rate than the hole transfer rate facilitate the electron-hole separation. PO 4 3- The inductive effect can promote electron-hole separation, which is beneficial to improve the catalytic performance under visible light. At the same time, Ag vacancy defects can participate in photoelectron capture, provide more photoexcited holes, and are also conducive to electron-hole separation. [0003] However, its morphology and properties are not easy to control, so there are few related preparation methods at present. ...

Claims

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Application Information

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IPC IPC(8): B01J27/18B01J35/02C01B25/37C02F1/58C02F1/30
Inventor 马培艳吴燕傅正义
Owner WUHAN UNIV OF TECH
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