Method for preparing visible light efficient multifunctional photocatalyst

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

Active Publication Date: 2007-03-28
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

However, due to TiO 2 It can only absorb ultraviolet light wit

Method used

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

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Embodiment Construction

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

[0012] 1. AgBr / TiO 2 Optical absorption properties and stability of catalysts

[0013] Add 1 g of P25 powder to 100 ml of deionized water, sonicate for 30 minutes, then add 1.2 g of cetyltrimethylammonium bromide (CTAB) to the suspension, stir at room temperature for 30 minutes, and then add 0.21 g of AgNO 3 and 2.3mlNH 4 OH (25wt% NH 3 ) prepared [Ag(NH) 3 ) 2 ] + solution. The resulting system was stirred at room temperature for 12 hours, then the samples were 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 was analyzed by UV-Vis diffuse reflection and X-ray diffraction, and the obtained results are shown in the figure.

[0014] Figure 1 shows that the absorption band boundary of P25 is around 400 nm, while that of AgBr / TiO 2 Th...

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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 preparation method of a visible light catalyst, in particular to a preparation method of 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, the electrodes and SnO coated with silver chloride 2 Experiment on photocatalytic oxidation of water with a thin layer of silver chloride on the coating. Noriyoshi et al. supported silver bromide on silica and studied its activity and stability under ultraviolet light. Roderigues e...

Claims

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Application Information

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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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