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Preparation method of hydrophobic TiO2 visible-light catalyst

A hydrophobicizing reagent, visible light technology, applied in physical/chemical process catalysts, chemical instruments and methods, adsorption water/sewage treatment, etc. Degradation, narrow spectral response range of titanium-based semiconductors, etc., to improve adsorption capacity and spectral response performance, facilitate large-scale production applications, and broaden the response range of visible light

Active Publication Date: 2018-01-09
HUAIYIN INSTITUTE OF TECHNOLOGY
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Problems solved by technology

However, the spectral response range of titanium-based semiconductors is narrow, and only 5% of the ultraviolet light in the solar spectrum can be used, resulting in a solar energy utilization rate of only about 1%.
Subsequently, workers in the field also developed new visible light-responsive titanium-based photocatalysts modified by noble metal deposition, semiconductor recombination or dye photosensitization, but these modified titanium-based photocatalytic materials have low specific surface area and a large number of hydroxyl groups on the surface. There is basically no adsorption capacity for hydrophobic organic pollutants, which directly affects its photocatalytic degradation efficiency
[0003] At present, for the problem of narrow spectral response range, those skilled in the art use metal (Fe 3+ 、Al 3+ , Zn 2+ etc.) or non-metal element (N) doping, semiconductor heterojunction compounding and other technical means to achieve the widening of the spectral response range, but the prepared photocatalyst has the problems of hydrophilicity, oil repellency and low specific surface area, which is difficult to be applied to strong photocatalysts. Adsorption and degradation of hydrophobic organic pollutants (such as pesticide pollutants, polycyclic aromatic hydrocarbon pollutants, etc.)
In this regard, workers in the field chemically modify titanium-based photocatalysts with surfactants (such as silyl groups) with hydrophobic groups to solve their hydrophilic problems; prepare mesoporous, hollow or nano-film titanium-based photocatalysts by templating , to solve the problem of its low adsorption capacity, but its preparation conditions are harsh and the cost is high
Although the above methods have solved the problems of spectral response range, hydrophobicity and specific surface area to varying degrees, it is difficult to solve the problem of hydrophilicity and improve its adsorption capacity while broadening its spectral response range. In addition, many The use of chemical modification reagents and the low adsorption performance of degradation intermediate products will bring multiple pollution to the environment and even reduce the degradation efficiency of titanium-based photocatalysts.

Method used

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  • Preparation method of hydrophobic TiO2 visible-light catalyst
  • Preparation method of hydrophobic TiO2 visible-light catalyst
  • Preparation method of hydrophobic TiO2 visible-light catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Weigh 20 g of irradiated modified attapulgite and dissolve it in 250 mL of ultrapure water, stir magnetically for 5 min, ultrasonically for 10 min, stir in a water bath at 60°C, add 4 g of octadecyltrimethylammonium chloride , and reacted for 4 hours under reflux to obtain hydrophobized photomodified attapulgite. Centrifuge at 10,000rpm to remove the precipitate, first wash with deionized water, and finally wash with ethanol (to remove unreacted substances), and dry in an oven at 80°C , and ground to obtain hydrophobized radiation-modified attapulgite powder.

[0030] (2) Weigh 0.6g Al 2 (SO 4 ) 3 Dissolved in 60 mL of ultrapure water, added 6 g of hydrophobized irradiation-modified attapulgite powder, and adjusted the movable ions to obtain Al 3+ Substituted hydrophobized irradiation modified attapulgite;

[0031] (3) Clean the crucible with deionized water, dry it in an oven for 60 minutes, weigh 16g of butyl titanate and dissolve it in 50mL of ultrapure water...

Embodiment 2

[0033](1) Weigh 20 g of irradiated modified attapulgite and dissolve it in 250 mL of ultrapure water, stir magnetically for 5 min, and ultrasonically for 10 min, stir in a water bath at 60°C, add 4 g of sodium linear alkylbenzene sulfonate, and reflux Hydrophobic irradiated modified attapulgite was obtained by reacting for 4 h in the state, centrifuged at 10,000 rpm to remove the precipitate, washed with deionized water and ethanol for 4 times, dried in an oven at 80°C, and ground to obtain the hydrophobized irradiated modified attapulgite. Sexual attapulgite powder.

[0034] (2) Weigh 0.6g Al 2 (SO 4 ) 3 Dissolved in 60 mL of ultrapure water, added 6 g of hydrophobized irradiation-modified attapulgite powder, and adjusted the movable ions to obtain Al 3+ Substituted hydrophobized irradiation modified attapulgite;

[0035] (3) Clean the crucible with deionized water, dry it in an oven for 60 minutes, weigh 16g of butyl titanate and dissolve it in 50mL of ultrapure water, a...

Embodiment 3

[0037] (1) Dissolve 20 g of irradiated modified attapulgite in 250 mL of ultrapure water, stir magnetically for 5 min, sonicate for 10 min, stir in a water bath at 60°C, add 4 g of polyacrylamide, and react for 4 h under reflux Obtain the attapulgite modified by hydrophobic irradiation, centrifuge at 10,000rpm to remove the precipitate, wash with deionized water and ethanol four times successively, dry in an oven at 80°C, and grind to obtain the hydrophobic irradiation modified attapulgite powder .

[0038] (2) Weigh 0.6g Al 2 (SO 4 ) 3 Dissolved in 60 mL of ultrapure water, added 6 g of hydrophobized irradiation-modified attapulgite powder, and adjusted the movable ions to obtain Al 3+ Substituted hydrophobized irradiation modified attapulgite;

[0039] (3) Clean the crucible with deionized water, dry it in an oven for 60 minutes, weigh 16g of butyl titanate and dissolve it in 50mL of ultrapure water, add 8g of Al prepared in step (2) 3+ For the replaced hydrophobized ir...

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Abstract

The invention discloses a preparation method of a hydrophobic TiO2 visible-light catalyst. The hydrophobic TiO2 composite visible-light catalyst with high adsorption and wide spectral response is prepared by utilizing the strong adsorption property of hydrophobic attapulgite after being irradiated by high-power electron beams and the doping vario-property of migrating metal cations on the surfaceof the attapulgite, and the problems that a TiO2 photocatalyst has no adsorption or concentration capacity for strongly hydrophobic organic pollutants and is narrow in the spectral response range aresolved. The novel hydrophobic TiO2 visible-light catalyst material has the capacity of efficient concentration of the strongly hydrophobic organic pollutants and visible light degradation, and can beused for light degradation of indoor and industrial low-concentration VOCs (volatile organic chemicals) and water bodies and strongly hydrophobic organic matters in soil.

Description

technical field [0001] The invention belongs to the technical field of preparation of visible light-responsive photocatalytic materials, and specifically relates to a high-adsorption performance and wide-spectrum hydrophobic TiO 2 Preparation method of visible light catalyst. Background technique [0002] Titanium-based semiconductors are important materials in the field of photocatalysis and can be widely used in environmental and energy fields such as catalytic degradation and hydrogen production. However, the spectral response range of titanium-based semiconductors is narrow, and only 5% of the ultraviolet light in the solar spectrum can be used, resulting in a solar energy utilization rate of only about 1%. Subsequently, workers in the field also developed new visible light-responsive titanium-based photocatalysts modified by noble metal deposition, semiconductor recombination or dye photosensitization, but these modified titanium-based photocatalytic materials have low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06C02F1/30C02F1/28C02F101/32
Inventor 张静马喜君陈静谢兴勇刘飞石莹莹庞建峰
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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