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Method for preparing visible light efficient multifunctional photocatalyst

A visible light, catalytic activity technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as application limitations

Active Publication Date: 2008-06-25
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to TiO 2 It can only absorb ultraviolet light with a wavelength of ≤400nm, and its application is greatly limited

Method used

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  • Method for preparing visible light efficient multifunctional photocatalyst
  • Method for preparing visible light efficient multifunctional photocatalyst
  • Method for preparing visible light efficient multifunctional photocatalyst

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Experimental program
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Embodiment Construction

[0011] The technical characteristics and advantages of the present invention can be seen through the embodiments and application examples given below.

[0012] 1. Optical absorption characteristics and stability of AgBr / TiO2 catalyst

[0013] 1g P25-TiO 2 The powder was added to 100ml deionized water, ultrasonicated for 30 minutes, then 1.2g of cetyltrimethylammonium bromide (CTAB) was added to the suspension, stirred at room temperature for 30 minutes and then added with 0.21g of AgNO 3 and 2.3mlNH 4 OH (25wt%NH 3 ) formulated with [Ag(NH 3 ) 2 ] + solution. The resulting system was stirred at room temperature for 12 hours, then a sample was centrifuged and dried at 70°C. Finally, the obtained powder was calcined at 500°C for 3 hours to obtain AgBr / TiO 2 Catalyst, the obtained sample is subjected to ultraviolet-visible diffuse reflectance and X-ray diffraction analysis, and the obtained results are shown in the figure.

[0014] figure 1 showed that P25-TiO 2 The ab...

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Abstract

The present invention relates to a preparation method of AgBr / TiO2 system with high-effective visible light photocatalytic activity. Said method includes the following steps: adding commercially-available Degussa P25 into deionized water, ultrasonic treatment for 20-50 min, then adding cetyl trimethyl ammonium bromide (CTAB) into the suspension, stirring them for 30 min at room temperature, then adding [Ag(NH3)2]+ solution, making Ag content in AgBr / TiO2 be 5-15 wt%, the mole ratio value of CTAB and Ag+ be 2-4, stirring obtained system at room temperature, making centrifugal separation of sample, dring at 70deg.C, calcining the obtained powder body at 450-650deg.C so as to obtain the invented AgBr / TiO2 sample.

Description

technical field [0001] The invention relates to a method for developing a visible light catalyst, in particular to a method for preparing a composite catalytic system in which silver bromide is supported on the surface of titanium dioxide. Background technique [0002] As an emerging water treatment technology, heterogeneous photocatalysis has been extensively studied. Titanium dioxide is valued for its highest catalytic activity and stability. However, due to TiO 2 It can only absorb ultraviolet light with a wavelength of ≤400nm, and its application is greatly limited. Recently, Calzafeeri et al. reported that under ultraviolet and visible light, when silver ions are present in the system, electrodes coated with silver chloride and SnO 2 Experiments on Photocatalytic Oxidation of Water with Silver Chloride Thin Layers on Coatings. Noriyoshi et al. supported silver bromide on silica and studied its activity and stability under ultraviolet light. Roderigues et al studied...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/08B01J21/06B01J37/02
Inventor 胡春兰永清
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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