Preparation method of doped nano-titanium dioxide with visible-light activity and preparation method of polishing emulsion of visible light photocatalytic photocatalyst

A nano-titanium dioxide, visible light technology, applied in physical/chemical process catalysts, chemical instruments and methods, polishing compositions, etc., can solve the problems of reducing photon quantum efficiency, low solar energy utilization rate, etc. Effect

Inactive Publication Date: 2014-08-13
长沙尚洁环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nano titanium dioxide is a representative of semiconductor photocatalytic materials. Its crystal structure is divided into rutile type, anatase type, brookite type and amorphous titanium dioxide. Among them, anatase type is mainly used as photocatalytic material, but titanium dioxide is a wide bandgap For semiconductor compounds, only sunlight with a shorter wavelength (λ<387nm) can be absorbed, and this part of ultraviolet light (300-400nm) only accounts for 4-6% of the sunlight reaching the ground, so the utilization rate of solar energy is very low; On the other hand, the holes and electrons formed by light excitation are easy to recombine, which reduces the photon quantum efficiency.

Method used

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  • Preparation method of doped nano-titanium dioxide with visible-light activity and preparation method of polishing emulsion of visible light photocatalytic photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Silver and nitrogen co-doped anatase titanium dioxide

[0034] Weigh 0.05 mol of tetrabutyl titanate and dissolve it in 15 mL of absolute ethanol, mix and stir for 15 minutes, add 0.01 mol of malic acid and mix well to obtain solution A;

[0035] Weigh 0.05mol silver nitrate, 0.025mol urea dissolved in 15mL absolute ethanol and 1mL deionized water, then add 0.025mol sodium thiosulfate, and use 1mol / L nitric acid to adjust the pH=3, mix well to obtain B solution ;

[0036] Slowly add B solution to A solution, aging, when the solution turns from sol to gel, put it in a vacuum drying oven at 80°C for drying, grinding, and continue calcination in a muffle furnace at 400°C 2h, grinding, you can get silver and nitrogen co-doped TiO 2 ;

[0037] (2) Preparation of the aqueous phase of the photoemulsion on the photocatalyst active photocatalyst dissolved in visible light

[0038] Weigh 0.01g of carboxylate and directly stir and disperse it in 100g of aqueous solution, and then add ...

Embodiment 2

[0045] (1) Silver and nitrogen co-doped anatase titanium dioxide

[0046] Weigh 0.05 mol of tetrabutyl titanate and dissolve it in 15 mL of absolute ethanol, mix and stir for 15 minutes, add 0.025 mol of glacial acetic acid and mix well to obtain A solution;

[0047] Weigh 0.3 mol of silver nitrate and 0.15 mol of ammonium carbonate in 15 mL of absolute ethanol and 1 mL of deionized water, then add 0.05 mol of sodium thiosulfate, and use 1 mol / L of nitric acid to adjust pH=4, mix well, and obtain B Solution

[0048] Slowly add B solution to A solution, aging, when the solution turns from sol to gel, put it in a vacuum drying oven at 60 ℃ for drying, grinding, continue to calcine in a muffle furnace at 300 ℃ 1h, grinding, you can get silver and nitrogen co-doped TiO2;

[0049] (2) Preparation of the aqueous phase of the photoemulsion on the photocatalyst active photocatalyst dissolved in visible light

[0050] Weigh 0.05g of sulfuric acid ester and directly stir and disperse it in 100g...

Embodiment 3

[0056] (1) Silver and nitrogen co-doped anatase titanium dioxide

[0057] Weigh 0.05 mol of tetrabutyl titanate and dissolve it in 15 mL of absolute ethanol, mix and stir for 15 minutes, add 0.015 mol of citric acid and mix well to obtain A solution;

[0058] Weigh 0.15mol silver nitrate, 0.07mol thiourea dissolved in 15mL of absolute ethanol and 1mL of deionized water, then add 0.01mol of sodium thiosulfate, and use 1mol / L of nitric acid to adjust the pH=2, mix well to obtain B Solution

[0059] Slowly add B solution to A solution, aging, and when the solution turns from sol to gel, put it in a vacuum drying oven at 100°C for drying, grinding, and continue calcination in a muffle furnace at 600°C 3h, grinding, you can get silver and nitrogen co-doped TiO 2 ;

[0060] (2) Preparation of the aqueous phase of the photoemulsion on the photocatalyst active photocatalyst dissolved in visible light

[0061] Weigh 0.025g of phosphate and directly stir and disperse it in 100g of aqueous solut...

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Abstract

The invention discloses a preparation method of doped nano-titanium dioxide with visible-light activity and a preparation method of polishing emulsion of a visible light photocatalytic photocatalyst. The silver-nitrogen co-doping is carried out on titanium dioxide nano particles, so that the forbidden bandwidth of the photocatalyst is reduced by the doped nano-TiO2 with the visible-light activity; furthermore, the photocatalyst material is compounded with oil polish for the first time, so that the polishing emulsion of the visible light photocatalytic photocatalyst having a function of removing organic pollutant in a photocatalytic way and the polishing decontamination capability can be prepared; the polishing emulsion does not have pungent smell and is free from secondary pollution; the methods provided by the invention are simple and easy to implement.

Description

Technical field [0001] The invention relates to a photocatalyst material and a preparation method and application thereof, in particular to a preparation method of visible light active nano titanium dioxide, and also relates to a preparation method of a visible light photocatalytic photocatalyst photoemulsion prepared by using the visible light active nano titanium dioxide . Background technique [0002] With the continuous improvement of people's health awareness, people have higher and higher requirements for the living environment, especially the living environment and the car interior environment. In the living environment, especially the newly decorated houses, newly purchased furniture and floors, as well as the interior of the car, many paints and polymer compounds are used. Especially when the car is running, it is generally closed, and it is easy to emit formaldehyde, Harmful gases such as benzene, amines, TVOC, etc. directly endanger people's health. Therefore, after ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24A62D3/17C09G1/12
Inventor 张娇霞陈国安
Owner 长沙尚洁环保科技有限公司
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