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Preparation method of CQDs/TiO2 sunlight photocatalyst

A photocatalyst and sunlight technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low utilization rate of solar energy spectrum and limited application, and achieve high solar light selectivity, The effect of abundant sources and improved efficiency

Inactive Publication Date: 2018-04-06
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of TiO 2 When catalytically degrading organic matter, ultraviolet radiation is required to activate, resulting in a very low utilization rate of solar energy spectrum, which is also TiO 2 As an important defect of photocatalyst, it limits its application

Method used

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  • Preparation method of CQDs/TiO2 sunlight photocatalyst
  • Preparation method of CQDs/TiO2 sunlight photocatalyst
  • Preparation method of CQDs/TiO2 sunlight photocatalyst

Examples

Experimental program
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specific Embodiment approach 1

[0016] Embodiment 1: (1) Preparation of carbon quantum dot solution: 0.5 g of corn stalk activated carbon, 40 mL of sodium hydroxide solution with a concentration of 5-10 moL / L, ultrasonic treatment for 30 min, hydrothermal reaction at 150 ° C for 14 h, 0.45 μm The ultrafiltration membrane was filtered to obtain a clear solution, and the dialysis was continued for three days with a molecular weight cut-off of 8000 to obtain a fluorescent carbon quantum dot solution in the bag.

[0017] (2) CQDs / TiO 2 Preparation: Weigh 0.2g of titanium dioxide (particle size 40nm) and disperse it in 50mL of absolute ethanol for ultrasonic treatment for 30min, add 30mL of carbon quantum dot solution, and stir for compounding for 2h. After centrifugation and washing with water, the CQDs / TiO 2 Solar photocatalyst.

[0018] CQDs / TiO prepared in this embodiment 2 The photocatalytic degradation rate can reach up to 98.1% when exposed to sunlight for 120 minutes.

specific Embodiment approach 2

[0019] Embodiment 2: This embodiment differs from Embodiment 1 in that: a sodium hydroxide solution with a concentration of 5 moL / L is added, and the hydrothermal temperature is 150-200° C. Others are the same as in the first embodiment.

[0020] CQDs / TiO prepared in this embodiment 2 The photocatalytic degradation rate can reach up to 98.4% when exposed to sunlight for 120 minutes.

specific Embodiment approach 3

[0021] Embodiment 3: This embodiment is different from Embodiment 2 in that: the water heating temperature is 170° C., and the water heating time is 12-20 hours. Others are the same as in the second embodiment.

[0022] CQDs / TiO prepared in this embodiment 2 The photocatalytic degradation rate can reach up to 99.0% when exposed to sunlight for 120 minutes.

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Abstract

The invention relates to a preparation method of a CQDs / TiO2 visible light photocatalyst. The invention overcomes the defect that titanium dioxide is catalytically degraded under sunlight, and CQDs / TiO2 prepared by introducing CQDs can rapidly and efficiently degrade organic pollutants under the sunlight, so that the disadvantage that TiO2 only can be catalytically degraded under ultraviolet lightis solved. The preparation method comprises the following steps: firstly carrying out ultrasonic processing on phosphoric acid activation corn stalk activated carbon with sodium hydroxide solution, then transferring into a hydrothermal reaction kettle, carrying out hydrothermal synthesis under certain conditions, neutralizing, and carrying out dialysis, so that a carbon quantum dot solution is obtained; taking right amount of titanium dioxide (particle size is 40nm) and dispersing into absolute ethyl alcohol, adding the carbon quantum dot solution, stirring and compounding, centrifuging, washing, and drying, so that the CQDs / TiO2 sunlight photocatalyst is obtained. The obtained QDs / TiO2 has the characteristic of efficient photocatalytic degradation under the sunlight, degradation rate is99.5% when photocatalytic degradation is carried out on Rhodamine B for 105 minutes in the sun, and the degradation rate is 99.9% when catalytic degradation is carried out for 120 minutes, so that theRhodamine B is basically completely degraded.

Description

technical field [0001] The present invention relates to a kind of CQDs / TiO 2 Preparation method of solar photocatalyst. Background technique [0002] With the development of my country's industry and society, the intensification of environmental pollution, especially water pollution, has caused pollution-type or water-quality-type water shortages in some areas that were originally rich in water resources. Photocatalytic oxidation technology has the advantages of simple operation, mild reaction conditions, low energy consumption and less secondary pollution, so it has attracted widespread attention in the field of water pollution control. TiO 2 Belongs to an n-type semiconductor material, due to TiO 2 Influenced by surface impurities and lattice defects, it can degrade organic pollutants into small molecules H in the ultraviolet wavelength range 2 O and CO 2 . Because of TiO 2 When catalytically degrading organic matter, ultraviolet radiation is required to activate, r...

Claims

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Application Information

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IPC IPC(8): B01J21/18C02F1/30C02F101/30
CPCC02F1/30B01J21/18C02F2305/10C02F2101/30B01J35/39
Inventor 韩世岩周军丹郭玉亮李淑君陈志俊姜贵全
Owner NORTHEAST FORESTRY UNIVERSITY
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