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Preparation method and application of cerium vanadate/modified attapulgite up-conversion heterojunction photocatalyst

The technology of attapulgite and photocatalyst is applied in the application field of photocatalytic degradation of styrene, which can solve the problems of low light absorption and utilization efficiency of photocatalyst, and achieve the effects of improving photocatalytic performance, improving utilization rate and improving reaction efficiency.

Active Publication Date: 2018-10-09
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the technical problem of low light absorption and utilization efficiency of photocatalysts, the present invention provides a quick and easy method—microwave hydrothermal synthesis of cerium vanadate / modified attapulgite up-conversion heterojunction materials, by optimizing the ratio of raw materials, Process parameters such as hydrothermal temperature and hydrothermal time can obtain the composite material with the best light absorption effect, so that its photocatalytic degradation effect is the best

Method used

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  • Preparation method and application of cerium vanadate/modified attapulgite up-conversion heterojunction photocatalyst
  • Preparation method and application of cerium vanadate/modified attapulgite up-conversion heterojunction photocatalyst
  • Preparation method and application of cerium vanadate/modified attapulgite up-conversion heterojunction photocatalyst

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Embodiment 1

[0025] First, weigh 2g of purified attapulgite and dissolve it in 100mL of phosphoric acid solution with a mass fraction of 30%. After ultrasonic dispersion, place it in a water bath, treat it at 70°C for 10 hours, and filter it with a circulating vacuum pump. The filter cake is fully washed with water. , dried at 60°C for 16 hours to obtain a modified attapulgite product; mix 0.73g EDTA with 0.86g Ce(NO 3 ) 3 After mixing evenly, add water to fully dissolve to obtain a solution, add 0.23g NH 4 VO 3 To the above solution, use 1M ammonia solution to adjust the pH to 10, then add 1 g of modified attapulgite to the above mixture, and stir until it is evenly mixed to obtain a mixture; finally transfer the above mixture to a 100mL reaction kettle, place In a microwave hydrothermal chemical reaction apparatus, react at 160°C for 1h, cool, centrifuge, wash after the reaction, dry at 80°C, and finally grind to obtain CeVO with a loading capacity of 50%. 4 / H-ATP composite.

[0026...

Embodiment 2

[0032] First, weigh 2g of purified attapulgite and dissolve it in 100mL of phosphoric acid solution with a mass fraction of 30%. After ultrasonic dispersion, place it in a water bath, treat it at 70°C for 10 hours, and filter it with a circulating vacuum pump. The filter cake is fully washed with water. , and dried at 60°C for 16 hours to obtain the acid-modified attapulgite product; mix 0.44g EDTA with 0.52g Ce(NO 3 ) 3 After mixing evenly, add water to fully dissolve to obtain a solution, add 0.14g NH 4 VO 3 to the above solution, adjust the pH to 9 with 1M ammonia solution, then add 1 g of modified attapulgite into the above mixture, and stir until it is evenly mixed to obtain a mixture; finally, transfer the mixture to a 100mL reaction kettle and place In a microwave hydrothermal chemical reaction apparatus, react at 170°C for 1.5h. After the reaction is completed, cool, centrifuge, wash, dry at 60°C, and finally grind to obtain CeVO with a loading capacity of 30%. 4 / H...

Embodiment 3

[0034] First, weigh 2g of purified attapulgite and dissolve it in 100mL of phosphoric acid solution with a mass fraction of 30%. After ultrasonic dispersion, place it in a water bath, treat it at 70°C for 10 hours, and filter it with a circulating vacuum pump. The filter cake is fully washed with water. , dried at 60°C for 16 hours to obtain the acid-modified attapulgite product; mix 0.29g EDTA with 0.35g Ce(NO 3 ) 3 After mixing evenly, add water to fully dissolve to obtain a solution, add 0.09g NH 4 VO 3 To the above solution, use 1M ammonia solution to adjust the pH to 8, then add 1g of modified attapulgite to the above mixture, stir well until the mixture is uniform, and obtain the mixture; finally transfer the mixture to a 100mL reaction kettle, place In a microwave hydrothermal chemical reaction apparatus, react at 170°C for 1.5h. After the reaction, cool, centrifuge, wash, dry at 90°C, and finally grind to obtain CeVO with a loading capacity of 20%. 4 / H-ATP composit...

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Abstract

The invention belongs to the technical field of photocatalysts, and particularly relates to a preparation method and application of a cerium vanadate / modified attapulgite up-conversion heterojunctionphotocatalyst. The preparation method comprises the following steps: with phosphoric acid modified attapulgite as a main body, adding cerium nitrate, ammonium metavanadate, EDTA and modified attapulgite to deionized water, heating and stirring, then transferring to a microwave hydrothermal reaction kettle, reacting in a microwave hydrothermal chemical reactor, and then centrifuging, washing and drying to obtain the cerium vanadate / modified attapulgite up-conversion heterojunction photocatalyst. According to the invention, phosphoric acid modified attapulgite is used to broaden the light absorption range, and constitutes a heterojunction together with a cerium vanadate semiconductor photocatalyst having up-conversion luminescence property, so as to not only convert near-infrared light intoultraviolet visible light, but also improve the light absorption and utilization, effectively separate photoproduced electron-hole pairs, and effectively degrade styrene, so that the cerium vanadate / modified attapulgite up-conversion heterojunction photocatalyst has greater application value in the field of volatile organic compound degradation.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and relates to nano-materials with heterojunctions constructed by phosphoric acid-modified attapulgite and cerium vanadate with upconversion luminescent properties as active components, a preparation method and the application of photocatalytic degradation of styrene. Background technique [0002] Volatile organic compounds (VOCs) are a class of important air pollutants and precursors for the formation of photochemical smog and haze. There are many kinds of VOCs, including alkanes, olefins, halogenated hydrocarbons, esters, aldehydes, ketones and aromatic compounds, mainly from pharmaceutical, petrochemical, printing and other industries. VOCs have a strong stimulating effect, have strong carcinogenic and teratogenic effects on humans, animals and plants, and will react under light to generate photochemical smog and secondary pollutants, seriously endangering human health and the ecologica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/198B01J37/10B01D53/86B01D53/72
CPCB01D53/8668B01J23/002B01J27/198B01J37/10B01J35/399B01J35/39
Inventor 李霞章石海洋左士祥姚超罗士平刘文杰
Owner CHANGZHOU UNIV
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