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Composite photocatalyst for degrading pesticide residues

A photocatalyst and composite technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as easy agglomeration and unstable anatase, and achieve uniform dispersion and crystal grain The effect of controllable components and low production cost

Inactive Publication Date: 2010-09-08
WUYI UNIV
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] Numerous studies have shown that nanoscale powdered TiO 2 Although the surface area is large and the photocatalytic activity is high, the anatase type with high photocatalytic activity is not stable and easy to agglomerate, and the problem of ease of operation in the process of pesticide residue degradation needs to be solved

Method used

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  • Composite photocatalyst for degrading pesticide residues
  • Composite photocatalyst for degrading pesticide residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Measure 10ml of tetrabutyl titanate, add 300ml of absolute ethanol to make a solution, drop 3-4 drops of glacial acetic acid at a stirring speed of 150r / min, and magnetically stir for 30min at room temperature to fully mix the solution to obtain A solution. At the same time, another 1 ml of distilled water and 200 ml of absolute ethanol were taken, and ZnO with a molar ratio of tetrabutyl titanate of 8:1 was added for compounding, and magnetically stirred for 30 minutes to obtain solution B. Slowly add the obtained B solution to A solution, add concentrated hydrochloric acid to adjust the pH to 3, and stir for 30 minutes to obtain stable, uniform, clear and transparent TiO 2 / ZnO sol. Put the sol into a vacuum drying oven and dry it at 80°C to form a xerogel. The xerogel was ground with an agate mortar to obtain a powder. Put the powder into a muffle furnace and heat-treat at 600°C to obtain nano-TiO 2 / ZnO powder. Then the obtained nano-TiO 2 / ZnO powder is hydro...

Embodiment 2

[0021] Measure 20ml of tetrabutyl titanate, add 300ml of absolute ethanol to make a solution, drop 3-4 drops of glacial acetic acid at a stirring speed of 150r / min, and magnetically stir for 30min at room temperature to fully mix the solution to obtain A solution. At the same time, another 1 ml of distilled water and 200 ml of absolute ethanol were taken, and ZnO compounded with tetrabutyl titanate at a molar ratio of 4:1 was added, and magnetically stirred for 30 minutes to obtain solution B. Slowly add the obtained B solution to A solution, add concentrated hydrochloric acid to adjust the pH to 4, and stir for 30 minutes to obtain stable, uniform, clear and transparent TiO 2 / ZnO sol. Put the sol into a vacuum drying oven and dry it at 80°C to form a xerogel. The xerogel was ground with an agate mortar to obtain a powder. Put the powder into a muffle furnace and heat-treat at 500°C to obtain nano-TiO 2 / ZnO powder. Then the obtained nano-TiO 2 / ZnO powder is hydrophili...

Embodiment 3

[0023] Measure 10ml of tetrabutyl titanate, add 300ml of absolute ethanol to make a solution, drop 3-4 drops of glacial acetic acid at a stirring speed of 150r / min, and magnetically stir for 30min at room temperature to fully mix the solution to obtain A solution. At the same time, another 1 ml of distilled water and 200 ml of absolute ethanol were taken, and ZnO with a molar ratio of tetrabutyl titanate of 6:1 was added for compounding, and magnetically stirred for 30 minutes to obtain solution B. Slowly add the obtained B solution to A solution, add concentrated hydrochloric acid to adjust the pH to 3, and stir for 30 minutes to obtain stable, uniform, clear and transparent TiO 2 / ZnO sol. Put the sol into a vacuum drying oven and dry it at 80°C to form a xerogel. The xerogel was ground with an agate mortar to obtain a powder. Put the powder into a muffle furnace and heat-treat at 600°C to obtain nano-TiO 2 / ZnO powder. Then the obtained nano-TiO 2 / ZnO powder is hydro...

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Abstract

The invention relates to a preparation method of a nanometer-level photocatalyst, in particular to water solution which is convenient to use for degrading pesticide residues and a preparation method thereof. The preparation method comprises the following steps of: firstly, mixing tetrabutyl titanate as a precursor of TiO2, anhydrous alcohol as a solvent and a certain amount of glacial acetic acid together, magnetically stirring for a period of time at room temperature for adequately mixing solution to obtain solution A; meanwhile, taking a certain amount of distilled water and anhydrous alcohol, adding different dosages of doping salts in percentage by mass and magnetically stirring for a period of time to obtain solution B; then slowly adding the obtained solution B to the solution A, adding concentrated hydrochloric acid to adjust pH value to be a proper value and stirring for a period of time to obtain a stable, uniform and transparent TiO2 sol; placing the sol into a vacuum drying box and baking the sol into a dried gel at 80 DEG C; grinding the dried gel by using an agate mortar to obtain powder; placing the powder into a muffle furnace and carrying out heat treatments on the powder at different temperatures to obtain nanometer TiO2 powder; carrying out hydrophilic modification on the obtained nanometer TiO2 powder to prepare nanometer TiO2 water solution with a certain concentration under the condition of a certain pH value, and finally bottling for being directly sprayed. The prepared nanometer photocatalyst has favorable transmission of light, low production cost, simple technological line and industrial application prospect.

Description

technical field [0001] The invention relates to a preparation method of a nanoscale photocatalyst, in particular to an easy-to-operate pesticide residue degradation aqueous solution and a preparation method thereof. Background technique [0002] Crops are the main source of food for human beings. The technology of spraying pesticides on crops to prevent and control diseases and insect pests can recover 10%-20% of yield loss. The use of pesticides with quick and direct effects has become the main measure to ensure agricultural production. However, the extensive use and abuse of pesticides has a wide range of hazards, and they stay in the atmosphere, soil and water for a long time, endangering human health and safety, and will destroy the ecological balance. Therefore, their decomposition and removal have attracted much attention. With the improvement of people's living standards and the demand for international trade after China's entry into WTO, the standards for pesticide r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/06B82B3/00A62D3/176A62D101/26
Inventor 尹荔松刘志平李昌明范海陆林立业阎爱国胡社军
Owner WUYI UNIV
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