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Nano zero-valent iron/titanium dioxide/graphene composite photocatalyst and application thereof

A composite technology of nano-zero-valent iron and graphene, which is applied in the field of pollutant treatment, can solve problems such as ineffective utilization, and achieve the effects of promoting the transfer and separation of photogenerated carriers, improving activity, and superior dispersion

Inactive Publication Date: 2021-03-30
阜阳莱纳环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to the anatase TiO 2 It is a wide-bandgap semiconductor (Eg=3.2eV), which can only respond to the short-wavelength ultraviolet part (λ<387nm, accounting for about 8% of solar energy), while the solar spectrum accounts for most of the visible light part (energy accounts for about 45%) ) is not effectively used

Method used

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  • Nano zero-valent iron/titanium dioxide/graphene composite photocatalyst and application thereof
  • Nano zero-valent iron/titanium dioxide/graphene composite photocatalyst and application thereof
  • Nano zero-valent iron/titanium dioxide/graphene composite photocatalyst and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A kind of nano zero valent iron / titanium dioxide / graphene composite photocatalyst, its preparation method comprises:

[0025] (1) Dissolve 2g of selenium powder in 100mL of hydrazine hydrate solution (80wt%), then add 30mL of ethanol solution in which 2.5mL of titanium tetrachloride is dissolved, after stirring and mixing, hydrothermally react at 220°C for 6h, after the reaction ends The product was centrifuged and washed with water to neutrality, washed twice with ethanol, and dried to obtain titanium diselenide compounded with hydrazine;

[0026] (2) Disperse 3 g of titanium diselenide compounded with hydrazine in 100 mL of absolute ethanol, slowly add 30 mL of an aqueous solution in which 0.1 g of ferrous sulfate is dissolved under stirring conditions, stir and react at 50 ° C for 2 h, filter, wash with water, Drying, calcining at 500°C for 2 hours, cooling to room temperature, and grinding into powder to obtain nanometer zero-valent iron / titanium dioxide composite m...

Embodiment 2

[0029] A kind of nano zero valent iron / titanium dioxide / graphene composite photocatalyst, its preparation method comprises:

[0030] (1) Dissolve 2g of selenium powder in 100mL of hydrazine hydrate solution (80wt%), then add 30mL of ethanol solution in which 1.8mL of titanium tetrachloride is dissolved, after stirring and mixing, hydrothermally react at 240°C for 4h, after the reaction ends The product was centrifuged and washed with water to neutrality, washed twice with ethanol, and dried to obtain titanium diselenide compounded with hydrazine;

[0031] (2) Disperse 3 g of titanium diselenide compounded with hydrazine in 100 mL of absolute ethanol, slowly add 30 mL of an aqueous solution in which 0.03 g of ferrous sulfate is dissolved under stirring conditions, stir and react at 60 ° C for 1 h, filter, wash with water, Drying, calcining at 500°C for 3 hours, cooling to room temperature, and grinding into powder to obtain nano-zero-valent iron / titanium dioxide composite mater...

Embodiment 3

[0034] A kind of nano zero valent iron / titanium dioxide / graphene composite photocatalyst, its preparation method comprises:

[0035] (1) Dissolve 2g of selenium powder in 100mL of hydrazine hydrate solution (80wt%), then add 30mL of ethanol solution in which 3mL of titanium tetrachloride is dissolved, stir and mix well, then hydrothermally react at 220°C for 6h, and after the reaction finishes, water The product was washed by centrifugation to neutrality, washed twice with ethanol, and dried to obtain titanium diselenide compounded with hydrazine;

[0036] (2) Disperse 3 g of titanium diselenide compounded with hydrazine in 100 mL of absolute ethanol, slowly add 30 mL of an aqueous solution in which 0.3 g of ferrous sulfate is dissolved under stirring conditions, stir and react at 50 ° C for 2 h, filter, wash with water, Drying, calcining at 600°C for 1 hour, cooling to room temperature, and grinding into powder to obtain nanometer zero-valent iron / titanium dioxide composite m...

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Abstract

The invention provides a nano zero-valent iron / titanium dioxide / graphene composite photocatalyst and application thereof. The preparation method of the nano zero-valent iron / titanium dioxide / graphenecomposite photocatalyst comprises the steps of: dispersing selenium powder in a hydrazine hydrate solution, then adding titanium tetrachloride for a hydrothermal reaction, and obtaining titanium diselenide nanosheets compounded with diamine; dispersing the titanium diselenide nanosheet compounded with diamine into ethanol, adding ferric salt for reduction reaction, and calcining to obtain a nano zero-valent iron / titanium dioxide composite material; dispersing graphene oxide in an ethanol-water mixed solvent, and then adding the nano zero-valent iron / titanium dioxide composite material to carryout a secondary hydrothermal reaction, so as to obtain the nano zero-valent iron / titanium dioxide / graphene composite photocatalyst. The composite photocatalyst provided by the invention has the performance of efficiently adsorbing and degrading the organophosphorus pesticide in the sun.

Description

technical field [0001] The invention relates to the technical field of pollutant treatment, in particular to a nanometer zero-valent iron / titanium dioxide / graphene composite photocatalyst and its application. Background technique [0002] China is a big country in the production and use of organophosphorus pesticides. In recent years, the amount of pesticide wastewater discharged in my country every year is 108m 3 Among them, those that have been treated only account for 7% of the total, and those that meet the standards only account for 1% of the processed volume. Therefore, the research on the effective treatment of refractory organophosphorus pesticide wastewater has very important practical significance, which is conducive to reducing agricultural pollution and protecting the ecological environment we depend on for survival. At present, biochemical methods are mainly used for the treatment of organophosphorus pesticide wastewater at home and abroad, such as SBR, contac...

Claims

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Application Information

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IPC IPC(8): B01J23/745C02F1/30C02F101/30
CPCB01J23/745C02F1/30C02F2305/10C02F2101/306B01J35/39
Inventor 程鹏周典曹雨
Owner 阜阳莱纳环保科技有限公司
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