Gadolinium chromate/silver/silver phosphate compound photocatalyst and application thereof in purification of volatile organic compounds (VOCs)

A photocatalyst and silver phosphate technology, which is applied in the fields of photocatalytic materials and environmental protection, can solve the problems such as failure to effectively improve the performance of photocatalytic purification of organic pollutants, and achieve the effects of short experimental period and simple preparation process.

Active Publication Date: 2019-09-17
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these existing heterogeneous system construction ideas and technologies generally sacrifice the original oxidation or reduction potential of the constituent monomers, and fail to effectively improve the performance of photocatalytic purification of organic pollutants.

Method used

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  • Gadolinium chromate/silver/silver phosphate compound photocatalyst and application thereof in purification of volatile organic compounds (VOCs)

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A gadolinium chromate / silver / silver phosphate composite photocatalyst: (1) Weigh gadolinium nitrate and chromium nitrate with a molar ratio of 1:1, grind them evenly in a mortar containing an appropriate amount of urea, and transfer them to the muffle furnace for air Gadolinium chromate was obtained by roasting at 850 °C for 3 h in the atmosphere; (2) Add 0.6 g gadolinium chromate to the silver ammonia solution prepared by 30 mL 42.47 g / L silver nitrate aqueous solution and 0.5 mol / L dilute ammonia water and stir for 30 min Then add 20 mL of 297.25 g / L glucose aqueous solution, and continue stirring for 5 min to obtain gadolinium chromate / silver complex; (3) Add 0.3 g of gadolinium chromate / silver complex to 30 mL of 9.47 g / L After stirring in the disodium hydrogen phosphate aqueous solution for 30 min, add 15 mL of 5.67 g / L silver nitrate aqueous solution dropwise, and continue stirring for 30 min to obtain the gadolinium chromate / silver / silver phosphate complex, taking...

Embodiment 2

[0025] A gadolinium chromate / silver / silver phosphate composite photocatalyst: (1) Weigh gadolinium nitrate and chromium nitrate with a molar ratio of 1:1, grind them evenly in a mortar containing an appropriate amount of urea, and transfer them to the muffle furnace for air Gadolinium chromate was obtained by roasting at 700 °C for 6 h in the atmosphere; (2) Add 0.6 g gadolinium chromate to 30 mL of 15.0 g / L silver nitrate aqueous solution and stir for 30 min, then add 10 mL of 5.0 g / L NaBH 4 aqueous solution, and continue to stir for 10 min to obtain gadolinium chromate / silver complex; (3) mix 0.3 g gadolinium chromate / silver complex with 0.05 g silver phosphate o C was calcined for 2 h to obtain the gadolinium chromate / silver / silver phosphate composite. The weight of the catalyst was 100%, the mass fraction of simple Ag was 11.1%, and the mass fraction of silver phosphate was 14.3%.

Embodiment 3

[0027] A gadolinium chromate / silver / silver phosphate composite photocatalyst: (1) Weigh gadolinium nitrate and chromium nitrate with a molar ratio of 1:1, grind them evenly in a mortar containing an appropriate amount of urea, and transfer them to the muffle furnace for air Gadolinium chromate was obtained by calcination at 800 °C for 4.5 h in the atmosphere; (2) 0.6 g of gadolinium chromate was added to 30 mL of 24.0 g / L silver nitrate water-ethanol mixed solution, and after 30 min of light under Xe lamp, gadolinium chromate / (3) Add 0.3 g of gadolinium chromate / silver complex into 30 mL of 14.21 g / L disodium hydrogen phosphate aqueous solution and stir for 30 min, then add 15 mL of 8.51 g / L silver nitrate aqueous solution dropwise, and After continuing to stir for 30 min, the gadolinium chromate / silver / silver phosphate composite was obtained. Taking the weight of the catalyst as 100%, the mass fraction of simple Ag was 0.4%, and the mass fraction of silver phosphate was 33.3%...

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Abstract

The invention discloses a gadolinium chromate/silver/silver phosphate compound photocatalyst and an application thereof in purification of volatile organic compounds (VOCs). The expression of the compound is GdCrO3/Ag/Ag3PO4. the preparation method comprises the following steps: 1) placing a gadolinium source and a chromium source into a mortar according to a ratio of 1:1, adding a proper amount of urea, uniformly carrying out grinding, and then carrying out roasting in a specific atmosphere at a high temperature to obtain gadolinium chromate; 2) loading silver particles on the gadolinium chromate to obtain a gadolinium chromate/silver compound; and 3) loading silver phosphate on the gadolinium chromate/silver compound to obtain the gadolinium chromate/silver/silver phosphate compound. Elemental Ag in the GdCrO3/Ag/Ag3PO4 prepared by the preparation method is subjected to plasma resonance under excitation of visible light to generate hot electron-hole pairs. The hot electron-hole pairs are connected with a semiconductor GdCrO3 and Ag3PO4 with energy gap separation without sacrificing oxidation or reduction potentials of the semiconductor GdCrO3 and Ag3PO4, so that the photocatalytic oxidation reduction capability of the compound is enhanced. The GdCrO3/Ag/Ag3PO4 is used for photocatalytic degradation of organic pollutants, and can completely catalyze purification of typical organic gas pollutants such as toluene, xylene, benzene and the like under visible light irradiation and mild reaction conditions such as 90 DEG C.

Description

technical field [0001] The invention relates to a gadolinium chromate / silver / silver phosphate composite photocatalyst and its application in VOCs purification, belonging to the technical field of photocatalytic materials and environmental protection. Background technique [0002] Photocatalytic pollutant degradation technology has the characteristics of mild reaction conditions and low energy consumption, and is one of the most promising technologies. However, conventional photocatalysts such as TiO 2 , there are problems such as rapid recombination of photogenerated electron-hole pairs, low quantum yield, and low purification efficiency. The construction of complex heterostructures is considered to be an effective method to reduce the recombination rate of photogenerated electron-hole pairs, for example, by constructing a Z-type heterojunction In 2 o 3 -Ag-Ag 3 PO 4 ( Chemical Engineering Journal , 2017, 320, 644-652.), or traditional type II heterojunction Ag 2 S / Ag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/188B01D53/86B01D53/44B01D53/72
CPCB01J27/188B01J35/004B01D53/864B01D53/8687
Inventor 芮泽宝黎景卫
Owner SUN YAT SEN UNIV
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