Visible-light-induced photocatalyst and preparation method thereof

A catalyst and visible light technology, which is applied in the field of photocatalysis and material chemistry, can solve the problems of no efficient and simple preparation method, and achieve the effects of short synthesis time, improved catalytic activity, and easy operation

Inactive Publication Date: 2013-06-12
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Although many researchers have made great efforts to improve the defects of pho

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  • Visible-light-induced photocatalyst and preparation method thereof

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Embodiment 1

[0023] 2. 428 g of TiMWW (titanium silicon molecular sieve) powder was added to 97 mL of distilled water, and the suspension was sonicated for 10 minutes. Add 10.1839 g of cetyltrimethylammonium bromide (CTAB) into the suspension, and after stirring for 30 minutes, dissolve 0.510g of AgNO in 19.7mL 3 NH 3 ·H 2 O (25%NH 3 ) solution was added to the above mixture, and finally the resulting mixture was stirred at room temperature for 24 hours. The product was filtered, washed with water and dried. at 2°C·min -1 The Ag-AgBr / TiMWW composite photocatalyst was obtained after calcining in an air atmosphere at 500 °C for 3 hours.

Embodiment 2

[0025] 2. 428 g of TiMWW (titanium silicon molecular sieve) powder was added to 97 mL of distilled water, and the suspension was sonicated for 10 minutes. 20.1839 g of cetyltrimethylammonium bromide (CTAB) were added to the suspension. After stirring for 30 minutes, dissolve 0.510g AgNO in 19.7mL 3 NH 3 ·H 2 O (25%NH 3 ) solution was added to the above mixture, and finally the resulting mixture was stirred at room temperature for 24 hours. The product was filtered, washed with water and dried. at 2°C·min -1 After calcining in an air atmosphere at 500°C for 3 hours, the Ag-AgBr / TiMWW composite photocatalyst was obtained.

Embodiment 3

[0027] 2.428g TiO 2 The powder was added to 97 mL of distilled water, and the suspension was sonicated for 10 minutes. 20.1839 g of cetyltrimethylammonium bromide (CTAB) were added to the suspension. After stirring for 30 minutes, dissolve 0.510g AgNO in 19.7mL 3 NH 3 ·H 2 O (25%NH 3 ) solution was added to the above mixture, and finally the resulting mixture was stirred at room temperature for 24 hours. The product was filtered, washed with water and dried. at 2°C·min -1 After calcination at 500°C in an air atmosphere for 3 hours, the Ag-AgBr / TiO 2 composite photocatalyst.

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Abstract

The invention discloses a visible-light-induced photocatalyst and a preparation method of the visible-light-induced photocatalyst. According to the visible-light-induced photocatalyst, Al2O3 or TiO2 or SiO2 or titanium silicalite molecular sieves is used as a carrier, cetyl trimethyl ammonium bromide or tetraethyl ammonium bromide or tetra-normal-butyl ammonium bromide or sodium bromide is used as a bromide source, by a deposition and precipitation method, AgNO3 and the bromide source are subjected to reaction to prepare Ag-AgBr, and the Ag-AgBr is immobilized on the carrier to obtain a Ag-AgBr/carrier visible-light-induced photocatalyst. The photocatalytic activity of the Ag-AgBr/carrier visible-light-induced photocatalyst can be compared by the catalytic degradation of different azo dyes in simulated visible light, the result shows that in the visible light, the photocatalytic activity of the photocatalyst is greatly improved, and especially when 50 mg/L acid red B (ARB) dye waste water is degraded, the degradation efficiency reaches 79% in 10 min. The preparation and operation process is easy and convenient, and the raw material is easy to get.

Description

technical field [0001] The invention relates to the technical fields of photocatalysis and material chemistry, especially to immobilize Ag-AgBr on ?-Al 2 o 3 , TiO 2 , SiO 2 Or a composite visible light catalyst on a TiMWW (titanium silicon molecular sieve) carrier and a preparation method thereof. Background technique [0002] Silver halide is a visible light photosensitive material, which is often immobilized on a carrier for photocatalytic reactions. Silver bromide particles can absorb a photon and release a photo-generated electron and a photo-generated hole under the irradiation of visible light or shorter wavelength light, and then the photo-generated electron can be combined with an Ag + Combine to form an Ag 0 atoms; this process can be represented by the following chemical equation. [0003] (1) [0004] ( : intertitial silver ions) (2) [0005] Eventually, silver bromide grains form clusters of silver atoms after repeated absorption of photons. ...

Claims

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Application Information

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IPC IPC(8): B01J29/89B01J27/08B01J27/125
Inventor 杨平赵阳阳周梦颖
Owner EAST CHINA NORMAL UNIV
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