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Preparation method and application of photocatalyst capable of removing refractory organic matters

A technology for refractory organic matter and photocatalyst, which is applied to the application field of photocatalyst in sewage treatment, can solve the problems of high energy consumption, difficult recovery, easy falling off, etc., and achieves the effects of simple preparation method, low cost and simple process operation.

Active Publication Date: 2015-12-30
INST OF AQUATIC LIFE ACAD SINICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide a preparation method of a photocatalyst that can preferentially remove refractory organic matter. The method is simple to operate, can significantly improve the visible light photocatalytic activity and hydrophobicity of the catalyst, and effectively solves the problem of the preparation process. Easy to agglomerate, high energy consumption, difficult to recycle after preparation, easy to fall off, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A photocatalyst capable of preferentially removing refractory organic matter and a preparation method thereof, the steps of which are:

[0034] 1) With butyl titanate and diethanolamine as the main raw materials, absolute ethanol as the solvent, and doped with strontium chloride, it is easy to prepare a visible light-responsive modified nano-titanium dioxide sol doped with alkaline earth elements;

[0035] 2) After soaking the bentonite particles in dilute acid solution for 26, 28 or 30 hours, wash with water until neutral, and the pH of the solution after washing the bentonite particles is 6.8 or 7.0 or 7.2;

[0036] 3) Loading the nano-titanium dioxide sol prepared in step 1 on the surface of pretreated bentonite particles to prepare a doped alkaline earth visible light-responsive composite photocatalyst;

[0037] 4) The composite photocatalyst was placed in the surfactant and stirred for 1 or 2 hours, filtered, washed with water, and dried at 100 or 102 or 105°C to p...

Embodiment 2

[0050] A photocatalyst capable of preferentially removing refractory organic matter and a preparation method thereof, the steps of which are:

[0051] 1) Using butyl titanate and diethanolamine as the main raw materials, absolute ethanol as the solvent, and strontium chloride doped to prepare a visible light-responsive modified nano-titanium dioxide sol doped with alkaline earth elements;

[0052] 2) After soaking the bentonite particles in dilute acid solution for 22, 23 or 25 hours, wash with water until neutral, and the pH of the solution after washing the bentonite particles is 7.2 or 7.3 or 7.5;

[0053] 3) Loading the above-prepared nano-titanium dioxide sol on the surface of pretreated bentonite particles to prepare an alkaline earth-doped visible light-responsive composite photocatalyst;

[0054] 4) The composite photocatalyst was placed in a surfactant and stirred for 1 or 2 hours, filtered, washed with water, and dried at 101 or 104 or 105°C to prepare a visible ligh...

Embodiment 3

[0063] An application of a responsive hydrophobic nanocomposite photocatalyst for removing refractory organic matter in sewage treatment, the steps of which are:

[0064] Taking agricultural wastewater containing organophosphorus pesticide (methamidophos) as the treatment object, the photocatalyst prepared in Example 1 was added to the agricultural wastewater under sunlight conditions (illuminance 50000-60000Lux) for photocatalytic degradation reaction, and the target was determined The concentration change of pollutants was used to investigate the preferential removal characteristics of photocatalytic filter balls for methamidophos. After 60 minutes of reaction, the removal rate of methamidophos reached 89%, and after 120 minutes of reaction, the removal rate of methamidophos reached 94%.

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Abstract

The invention discloses a preparation method and an application of a photocatalyst capable of preferentially removing refractory organic matters. The preparation method comprises the steps of (1) by taking tetrabutyl titanate as raw materials and ethyl alcohol absolute as a solvent, doping strontium (solonetz element) to prepare solonetz element doped photoresponse type modified nano titanium dioxide sol; (2) soaking bentonite particles in a diluted hydrochloric acid solution, and washing the bentonite particles by water until the bentonite particles are neutral, wherein the pH value of the solution for washing the bentonite particles is 6.5-7.5; and (3) loading the prepared nano titanium dioxide sol on the surfaces of the pretreated bentonite particles to prepare a solonetz doped responding type composite photocatalyst; and (4) stirring the compsite photocatalyst in a surface active agent, filtering, washing by water, drying under a certain condition to prepare the light responding type hydrophobic nano composite photocatalyst. The photocatalyst is applied to the sewage treatment, the operation is simple, visible-light photocatalysis activity and hydrophobic property of the catalyst can be obviously improved, and the problems of easiness in agglomeration, high energy consumption, difficulty in recovering after preparation, easiness in falling and the like can be solved.

Description

technical field [0001] The present invention relates to the technical field of photocatalyst preparation, in particular to a method for preparing a photocatalyst capable of preferentially removing refractory organic matter, and also relates to the application of a photocatalyst capable of preferentially removing refractory organic matter in sewage treatment. Catalysts can be widely used in the field of water treatment. Background technique [0002] Photocatalytic technology is a green high-tech with important application prospects in the environmental field, and has been widely used in the degradation of refractory pollutants in gas and water phases. At present, the photocatalysts used for photocatalytic degradation of environmental pollutants are mostly metal oxides of n-type semiconductor materials. Among many semiconductor photocatalysts, TiO 2 With its advantages of high activity, safety and non-toxicity, stable chemical properties, and low cost, it is recognized as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/02C02F1/30
CPCY02W10/37
Inventor 吴振斌张义贺锋孔令为徐栋成水平刘子森杨晓龙
Owner INST OF AQUATIC LIFE ACAD SINICA