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Preparation method of Ag-AgCl-TiO2/rectorite composite photochemical catalyst

A rectorite and catalyst technology, applied in the field of preparation of Ag-AgCl-TiO2/rectorite composite photocatalyst, achieves high photocatalytic degradation activity, low reaction temperature and simple preparation process

Inactive Publication Date: 2012-02-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention relates to modifying TiO with Ag-AgCl 2 , use the surface plasmon effect to improve its photocatalytic activity under visible light, and use rectorite as the catalyst carrier to improve its adsorption performance and recyclability. At present, there are no relevant reports on the preparation and catalytic application of this composite material.

Method used

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  • Preparation method of Ag-AgCl-TiO2/rectorite composite photochemical catalyst
  • Preparation method of Ag-AgCl-TiO2/rectorite composite photochemical catalyst
  • Preparation method of Ag-AgCl-TiO2/rectorite composite photochemical catalyst

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Embodiment 1

[0024] Ag-AgCl-TiO 2 The preparation method of / rectorite composite photocatalyst, it comprises the following steps:

[0025] 1) Add 35mL of tetraisopropyl titanate solution dropwise into 18wt%-19wt% HCl solution under constant stirring at 25°C to obtain a molar ratio of [Ti] ions / [H] ions of 1:3.8 The solution was stirred for 3h to obtain light yellow transparent TiO 2 Pillar solution (or TiO 2 Sol).

[0026] 2) Weigh 2.5 g of rectorite into 250 mL of distilled water, and stir at room temperature for 5 h to obtain a 1 wt.% rectorite suspension.

[0027]By TiO 2 The ratio of the pillar solution and the rectorite suspension with a concentration of 1wt.% is 65mL: 250mL, and the TiO 2 Pillar solution (TiO 2 Sol) was dripped into the suspension solution of rectorite at a rate of 3 drops / 1 minute with a peristaltic pump, stirred at a constant temperature of 70°C for 3h, then aged at 25°C for 15h, and adjusted the pH value between 2.5-3.0 with 5M NaOH solution , centrifuged, r...

Embodiment 2

[0036] In order to test the effect of different titanium sources on Ag-AgCl-TiO 2 Influence of the photocatalytic performance of / rectorite composite photocatalyst, using organic titanium source tetraisopropyl titanate and inorganic titanium source titanium tetrachloride as raw materials respectively, other reaction conditions such as silver nitrate concentration (0.05mol / L), TiO 2 / Rectorite final pH value (2.5-3.0) and photoreduction time (3h) etc. are all identical with embodiment 1. The experimental results show that when titanium tetrachloride is used as the titanium source, the prepared Ag-AgCl-TiO 2 The degradation rate of acid red G / rectorite composite photocatalyst was 67.6%, and the adsorption performance of the catalytic material to organic dyes also decreased. It also shows that the Ag-AgCl-TiO prepared by this method 2 / rectorite composite photocatalyst has good photocatalytic performance under visible light.

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Abstract

The invention relates to a preparation method of an Ag-AgCl-TiO2 / rectorite composite photochemical catalyst. The preparation method of the Ag-AgCl-TiO2 / rectorite composite photochemical catalyst is characterized by comprising the following steps of: slowly dripping an ethanol solution of AgNO3 into a suspension aqueous solution of TiO2 / rectorite; as chloride ions are introduced to the process of preparing the TiO2 / rectorite, generating an AgCl-TiO2 / rectorite composite material in the process of dripping silver nitrate; and then irradiating the AgCl-TiO2 / rectorite composite material by utilizing a visible light (a dysprosium lamp of 300 W) so that a part of Ag<+> is subjected to photo-reduction to obtain metal Ag<0> and then obtain the Ag-AgCl-TiO2 / rectorite composite photochemical catalyst. According to the preparation method provided by the invention, the photocatalytic performance of the prepared composite photochemical catalyst under the visible lights is good and the preparation process is simple.

Description

technical field [0001] The present invention relates to Ag-AgCl-TiO with visible light activity 2 The invention relates to the preparation of a rectorite composite photocatalyst, which belongs to the technical field of photocatalysis and new materials. Background technique [0002] In recent years, photocatalytic technology, as an emerging water treatment technology, has been extensively studied. TiO 2 It has been valued because of its strong oxidizing ability, non-toxicity and photochemical stability. But TiO 2 As a photocatalytic material, it has certain limitations. Its wide band gap limits its absorption wavelength to the ultraviolet region, which greatly limits its application. In addition, TiO 2 The particles are of nanometer size, and they are uniformly dispersed in the water body, which is not convenient for their recycling. Therefore, from a practical and commercial point of view, it is necessary to improve the TiO 2 Visible light photocatalytic activity and ...

Claims

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Application Information

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IPC IPC(8): B01J27/135C02F1/30C02F103/30
Inventor 张高科杨艳青
Owner WUHAN UNIV OF TECH
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