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Rare-earth-ion-doped cerium trifluoride/graphite-phase carbon nitride composite photocatalytic material, and preparation method and application thereof

A graphite phase carbon nitride, composite photocatalysis technology, applied in chemical instruments and methods, physical/chemical process catalysts, special compound water treatment, etc., can solve the problem of low photocatalytic activity, easy recombination of photogenerated electron holes, sunlight problems such as low utilization rate, to achieve the effect of good photocatalytic activity, uniform distribution, and promotion of effective separation

Pending Publication Date: 2020-09-29
YANCHENG INST OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of low utilization rate of sunlight, easy recombination of photogenerated electrons and holes, and low photocatalytic activity, the invention provides a rare earth ion-doped cerium trifluoride-graphite phase carbon nitride composite photocatalytic material and its preparation Method and application, the composite photocatalytic material has wide spectral response characteristics, and the heterojunction structure is constructed by in-situ growth of rare earth-doped cerium trifluoride nanoparticles with uniform particle size on the surface of two-dimensional graphitic carbon nitride ; On the one hand, rare earth ions doped cerium trifluoride as a photocatalytic material, forming a heterojunction structure with graphitic carbon nitride to promote the effective separation of photogenerated electrons and holes; on the other hand, rare earth ions doped cerium trifluoride As an up-conversion luminescent material, cerium can up-convert near-infrared light or visible light into visible light or ultraviolet light, expand the spectral response range of composite materials, and improve photocatalytic activity

Method used

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  • Rare-earth-ion-doped cerium trifluoride/graphite-phase carbon nitride composite photocatalytic material, and preparation method and application thereof
  • Rare-earth-ion-doped cerium trifluoride/graphite-phase carbon nitride composite photocatalytic material, and preparation method and application thereof
  • Rare-earth-ion-doped cerium trifluoride/graphite-phase carbon nitride composite photocatalytic material, and preparation method and application thereof

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Effect test

Embodiment 1

[0026] A preparation method of a rare earth ion-doped cerium trifluoride-graphite phase carbon nitride composite photocatalytic material, comprising the following steps:

[0027] (1) After 5g of dicyandiamide is put into a mortar and ground into a fine powder, it is dried at 80°C for 10 hours, then fully ground, and then the crushed powder is put into a crucible and placed in a muffle furnace at 5°C / min heating rate, calcined at 550°C for 4 hours and cooled in the furnace, and obtained light yellow graphite phase carbon nitride powder g-C after grinding 3 N 4 ;

[0028] (2) Weigh 2g of g-C 3 N 4 Dissolved in deionized water and ultrasonicated for 30 minutes to obtain a suspension solution, 1.736gCe(NO 3 ) 3 ·6H 2 O, 0.0265g Pr(NO3 ) 3 ·6H 2 O, 0.45g NH 4 Add F to the suspension solution above, then slowly add acetic acid dropwise to adjust the pH of the system to 4-5, and finally add the mixed solution to the hydrothermal reaction kettle for 10 hours of hydrothermal ...

Embodiment 2

[0033] The 40%wt CeF prepared in Example 1 3 :1.5%Pr 3+ / g -C 3 N 4 The application of composite materials on the degradation of dye wastewater, the application includes the following steps:

[0034] Weigh 0.05g methylene blue and dissolve it in 500mL deionized water to prepare a 100mg / L methylene blue solution, add 0.01g, 40%wt CeF 3 :1.5%Pr 3+ / g -C 3 N 4 Composite material, after dark adsorption for 30 minutes, introduce visible light, take 3mL reaction solution every 30 minutes, transfer to a centrifuge tube, centrifuge the sample in the centrifuge tube at 6000r / min for 5 minutes, collect the supernatant after centrifugation, and transfer it further In the quartz cuvette, measure its absorbance (the methylene blue maximum absorption wavelength is at 665nm place) at the dyestuff maximum absorption wavelength place with a spectrophotometer, the methylene blue degradation rate is calculated according to the following formula:

[0035] D=(1-A / A 0 )×100%

[0036] Where...

Embodiment 3

[0038] Get the light yellow graphite phase carbon nitride powder g-C prepared by step 1 in embodiment 1 3 N 4 , for subsequent experiments.

[0039] (1) Weigh 2g of g-C 3 N 4 Added into deionized water and ultrasonicated for 30 minutes, 0.434gCe(NO 3 ) 3 ·6H 2 O, 0.0066g Pr(NO 3 ) 3 6H2O, 0.1125g NH 4 Add F to the suspension solution, slowly add acetic acid dropwise to adjust the pH of the system to 4-5, and finally add the mixed solution to a hydrothermal reaction kettle at 160°C for 10 hours of hydrothermal reaction.

[0040] (2) The sample obtained in step (1) was added to deionized water and ethanol for multiple centrifugal washing, dried at 80°C for 10 hours, and ground to obtain 10%wt CeF 3 :1.5%Pr 3+ / g -C 3 N 4 composite material.

[0041] Subsequent detection is as in Example 1, and the degradation rate of methylene blue reaches 72%.

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Abstract

The invention discloses a rare-earth-ion-doped cerium trifluoride / graphite-phase carbon nitride composite photocatalytic material, and a preparation method and application thereof. The preparation method comprises the following steps: putting g-C3N4 into deionized water for ultrasonic stripping to obtain a suspension solution, adding Ce(NO3)3. 6H2O, NH4F and Pr(NO3)3. 6 H2O into the suspension solution, adjusting the pH value of a formed system to 4-5, and carrying out magnetic stirring and uniform mixing; and then transferring a mixture obtained in the previous step into a high-pressure hydrothermal reaction kettle with a stainless steel jacket and a polytetrafluoroethylene liner, and carrying out a hydrothermal reaction in the hydrothermal reaction kettle at 160-180 DEG C for 10-16 hoursto obtain the rare-earth-ion-doped cerium trifluoride / graphite-phase carbon nitride up-conversion composite photocatalytic material. The material is applied to the field of photocatalytic degradationof dye wastewater, and the degradation rate of methylene blue reaches 93% after visible light illumination is performed for 60 min.

Description

technical field [0001] The invention relates to the field of new chemical materials, in particular to a rare earth ion-doped cerium trifluoride-graphite phase carbon nitride composite photocatalyst material and a preparation method and application thereof. Background technique [0002] With the development of my country's textile industry, a large amount of organic dye wastewater has been produced. If this kind of wastewater is not properly treated, it will seriously pollute the environment and threaten human health. At present, the methods commonly used in the treatment of industrial dye wastewater at home and abroad include: biological treatment, chemical flocculation, chemical oxidation, adsorption and electrochemical methods. However, there are some problems such as secondary pollution, low treatment efficiency, high treatment and operation costs, and cannot meet the requirements of sustainable development. However, the application of photocatalytic degradation technolo...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10B01J35/02C02F1/30C02F101/30
CPCB01J27/24C02F1/30C02F2101/308C02F2305/10B01J35/394B01J35/61B01J35/40B01J35/39
Inventor 陆晓旺张勤芳侯海军
Owner YANCHENG INST OF TECH
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