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Method for preparing light catalyst for pesticide

A photocatalyst and pesticide technology, applied in the field of chemistry, can solve the problems of limited application scope and limited activity, and achieve the effect of broad application prospects, buffer decomposition, and no secondary pollution.

Inactive Publication Date: 2005-05-18
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, TiO 2 Limited activity, only responds to ultraviolet light, which limits its practical application range

Method used

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  • Method for preparing light catalyst for pesticide

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Experimental program
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Effect test

Embodiment Construction

[0022] I. Preparation of photocatalyst TiO 2 / Ag:

[0023] First, 0.01-0.2mol of Ti(SO 4 ) 2 Put it in a 500mL flask and hydrolyze it in a constant temperature water bath at 80°C for 3-4 hours under constant stirring; the TiO produced after hydrolysis 2 The gel is coagulated with 0.01-0.5mol / L potassium hydroxide (pH ≈ 2), centrifuged, and washed with deionized water several times to remove SO 4 2- 、K + and other soluble ions to improve photocatalytic activity; then use 1M hydrochloric acid to peptize the precipitate and stir for 2 hours to obtain a transparent or translucent sol; add a small amount of water-dispersed TiO to the colloid 2 Particles are used as seed crystals, matured at 100-110°C for 10-20 minutes, centrifuged, precipitated and washed, and chloride ions are removed; when TiO 2 A few drops of perchloric acid should be added when the water dispersion system is stored to prevent the aggregation of nanoparticles; 2 Light yellow nano-TiO was obtained by vacuu...

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Abstract

The present invention relates to chemical process, and is especially the preparation process of light catalyst for pesticide. The present invention features that TiO2 surface is modified with water solution of sodium dedecyl benzene sulfonate. In 200 ml of 1.0 % concentration water solution of sodium dedecyl benzene sulfonate, 2 g of TiO2 / Ag is added and stirred at 50 deg.c for 6 hr, and through subsequent filtering, washing, and drying at 100 deg.c, the pesticide sample has relatively high adsorption effect of 200 mg / g in water solution. The light catalyst for pesticide has the advantages of low cost, easy preparation, no secondary pollution and other advantages, and may be used in solving water pollution effectively.

Description

Technical field: [0001] The present invention relates to chemical methods, in particular to methods of preparing photocatalysts for use in pesticides. Background technique: [0002] People use a lot of pesticides such as herbicides, insecticides, and fungicides in order to develop agricultural production and prevent pests and diseases. Rainwater flows into rivers or infiltrates into groundwater. Therefore, in order to reduce water pollution, in addition to reducing sewage discharge, drinking water, sewage and waste water containing non-biodegradable substances are usually treated. [0003] Among many sewage treatment methods, photocatalytic degradation of organic pollutants is an effective one without causing secondary pollution. Photocatalytic degradation of organic matter refers to the rapid degradation of organic matter by the aqueous solution of organic matter under the action of a catalyst and supplemented by light. This method of oxidative degradation of organic matte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/50B01J37/02C02F1/30
CPCY02W10/37
Inventor 黄可龙阎建辉刘素琴王晓光司士辉王跃龙
Owner CENT SOUTH UNIV
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