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Preparation method of rodlike structure graphene quantum dot/cerium oxide composite photocatalyst

A graphene quantum dot and rod-like structure technology, applied in the field of photocatalytic applications and composite materials, can solve problems such as unsatisfactory catalytic performance, and achieve the effect of improving photocatalytic ability and enhancing transfer life.

Active Publication Date: 2020-01-03
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although CeO 2 It has its own advantages and potential in catalytic applications, but its wide band gap leads to unsatisfactory catalytic performance in practical applications

Method used

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  • Preparation method of rodlike structure graphene quantum dot/cerium oxide composite photocatalyst
  • Preparation method of rodlike structure graphene quantum dot/cerium oxide composite photocatalyst
  • Preparation method of rodlike structure graphene quantum dot/cerium oxide composite photocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] GQDs / CeO 2 Composite material: weigh 0.1 g CeO 2 Nanoparticles and 1.5 mg GQDs (1.5 wt%) were dispersed in 20 mL of aqueous solution, ultrasonically dispersed for 30 min; then transferred to a reaction kettle, heated to 100 °C for 3 h; cooled, and the product was centrifuged (9000-10000 rpm) , washed with ultrapure water, and vacuum freeze-dried at -50°C for 10 h to obtain GQDs-1.5 / CeO 2 composite material.

[0027] GQDs-1.5 / CeO 2 The removal rate of the composite material for RhB: 79.3% in 180 min.

Embodiment 2

[0029] GQDs / CeO 2 Composite material: weigh 0.1 g CeO 2 Nanoparticles and 3.0 mg GQDs (3.0 wt%) were dispersed in 20 mL of aqueous solution, ultrasonically dispersed for 30 min; then transferred to a reaction kettle, heated to 100 °C for 3 h; cooled, and the product was centrifuged (9000-10000 rpm) , washed with ultrapure water, and vacuum freeze-dried at -50°C for 10 h to obtain GQDs-3.0 / CeO 2 composite material.

[0030] GQDs-3.0 / CeO 2 The removal rate of the composite material for RhB: 93.3% in 180 min.

Embodiment 3

[0032] GQDs / CeO 2 Composite material: weigh 0.1 g CeO 2 Nanoparticles and 4.5mg GQDs (4.5 wt%) were dispersed in 20mL aqueous solution, ultrasonically dispersed for 30 min; then transferred to a reaction kettle, heated to 100°C for 3 h; cooled, and the product was centrifuged (9000-10000 rpm) , washed with ultrapure water, and vacuum freeze-dried at -50°C for 10 h to obtain GQDs-4.5 / CeO 2 composite material.

[0033] GQDs-4.5 / CeO 2 The removal rate of the composite material for RhB: 94.4% in 180 min.

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Abstract

The invention provides a rodlike structure graphene quantum dot / cerium oxide composite photocatalyst. The rodlike structure graphene quantum dot / cerium oxide composite photocatalyst is prepared by thesteps: adding CeO2 nanoparticles into a graphene quantum dot aqueous solution, and after ultrasonically dispersing uniformly, transferring into a reaction kettle to perform hydrothermal reaction; andafter the reaction ends, cooling, centrifugally separating products, washing with ultrapure water and performing freeze drying. The rodlike composite material is obtained by taking CeO2 as a photocatalyst and GQDs as a photosensitive agent under the hydrothermal condition, wherein the surface of the CeO2 is wrapped with the GQDs. On one hand, in the hydrothermal treatment process, the GQDs outside the material achieve the structure guide effect, so that the composite material has optimized sequential rodlike special appearance; and on the other hand, the small-size GQDs are on the surface ofthe CeO2, so the electron-cavity transfer life under the irradiation of the composite material visible light is prolonged, the photocatalytic capacity of the composite photocatalyst is improved and application prospect in the fields of photocatalytic waste water treatment and the like is achieved.

Description

technical field [0001] The invention relates to a composite photocatalyst of cerium oxide, in particular to a graphene quantum dot / cerium oxide (GQDs / CeO 2 ) preparation method, which is used for photocatalytic degradation of organic pollutants, and belongs to the field of composite materials and the field of photocatalytic application. Background technique [0002] Cerium oxide (CeO 2 ) is a commonly used photocatalyst, and its crystal belongs to the fluorite face-centered cubic structure (each Ce 4+ 8 O's around the ion 2- ions), its light absorption threshold can reach 420 nm, which is higher than that of the commonly used semiconductor material TiO 2 . Although CeO 2 It has its own advantages and potential in catalytic applications, but its wide band gap leads to unsatisfactory catalytic performance in practical applications. [0003] Graphene quantum dots (GQDs) GQDs have large specific surface area, excellent photoelectric performance, good dispersion and biocomp...

Claims

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Application Information

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IPC IPC(8): B01J23/10C02F1/30C02F101/30
CPCB01J23/10C02F1/30C02F2101/30C02F2305/10B01J35/39Y02W10/37
Inventor 莫尊理张红娟裴贺兵贾倩倩陈颖郭瑞斌
Owner NORTHWEST NORMAL UNIVERSITY
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