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A kind of photocatalyst, preparation method and use method thereof

A photocatalyst, photonic crystal technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems affecting pollutant adsorption capacity and photodegradation efficiency, poor stability of composite catalysts, low specific surface area, etc. To achieve the effect of prolonging the fluorescence decay life, strong adsorption and capture ability, and large specific surface area

Active Publication Date: 2020-11-17
BENGBU COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Patent application number CN201710829833.2 discloses a CQDs / TiO 2 The preparation method of sunlight photocatalyst uses corn stalk activated carbon as carbon source to prepare carbon quantum dot solution, and TiO 2 After mixing, CQDs / TiO 2 Composite catalyst, simple process, wide source of raw materials, and improved TiO 2 Photocatalytic activity, but CQDs solution and TiO 2 Only simple mixing, no chemical crosslinking, the stability of the obtained composite catalyst is poor, and the solid TiO 2 Materials compared to hollow TiO 2 Materials, with lower specific surface area, affect their adsorption capacity for pollutants and photodegradation efficiency

Method used

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  • A kind of photocatalyst, preparation method and use method thereof
  • A kind of photocatalyst, preparation method and use method thereof
  • A kind of photocatalyst, preparation method and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Preparation method of photocatalyst

[0028] (1) Preparation of carbon quantum dot solution

[0029] After heating 10mL of 3-aminopropyltriethoxysilane to 190°C, add 0.5g of citric acid, stir the reaction for 1min, cool to room temperature, then add 15mL of absolute ethanol solution dropwise to dilute, and after ultrasonic treatment for 5min, carbon The quantum dot solution was placed in a brown bottle and refrigerated at 4°C for later use.

[0030] (2) Preparation of carbon nanosphere template

[0031] Treat 0.01mol / L glucose solution with an ultrasonic cleaner for 10 minutes, then pipette 40ml into a polytetrafluoroethylene high-pressure reactor, and place it in an oven at 180°C for 6 hours, remove the reactor, and cool naturally to obtain black or dark brown Suspended liquid was suction-filtered and washed until the filtrate was clear, and then dried in an oven at 100°C to obtain a black nano-carbon sphere template, which was sealed for future use.

[0032] (3)...

Embodiment 2

[0048] Same as Example 1, the difference is:

[0049] 1. Preparation method of photocatalyst

[0050] (1) The heating temperature is 195°C; (2) The carbonization reaction temperature is 190°C and the time is 6.5h; (3) The temperature is raised to 550°C; (4) The amount of concentrated ammonia water is 0.16mL.

[0051] 2. Molecular identification and optical property analysis of photocatalysts

[0052] (1) The average particle size of carbon nanospheres is 810nm; (2) CQDs / TiO 2 The average particle size of the nanocomposite photocatalyst is 810nm; (4) the amount of the catalyst added is 30mg; (5) the concentration of the methyl orange solution is 15mg / L.

Embodiment 3

[0054] Same as Example 1, the difference is:

[0055] 1. Preparation method of photocatalyst

[0056] (1) The heating temperature is 200°C; (2) The carbonization reaction temperature is 200°C and the time is 7h; (3) The temperature is raised to 600°C; (4) The amount of concentrated ammonia water is 0.17mL.

[0057] 2. Molecular identification and optical property analysis of photocatalysts

[0058] (1) The average particle size of carbon nanospheres is 825nm; (2) CQDs / TiO 2 The average particle size of the nanocomposite photocatalyst is 825nm; (4) the amount of the catalyst added is 50mg; (5) the concentration of the methyl orange solution is 15mg / L.

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Abstract

The invention discloses a photocatalyst as well as a preparation method and application method thereof. The photocatalyst is composite photonic grains formed by carrying out covalent linkage on silanized carbon quantum dots and hollow titanium dioxide, and the optimal use concentration is 0.3-0.5 g / L. The preparation method comprises the following steps of S1, taking citric acid as a carbon source, taking 3-aminopropyltriethoxysilane as a coupling agent, and preparing a silanized carbon quantum dot solution; S2, carbonizing a glucose solution at the temperature of 180-220 DEG C and preparing nano carbon spheres; S3, taking the nano carbon spheres as a core template, taking tetrabutyl titanate as a raw material, and preparing the hollow TiO2; and S4, carrying out covalent bonding on the carbon quantum dots and the hollow TiO2 so as to prepare the CQDs / TiO2 nano composite photocatalyst. According to the photocatalyst as well as the preparation method and application method thereof, the silanized carbon quantum dots are adopted to perform surface modification on the hollow TiO2, so that the energy gap is narrowed, the recombination rate of electron-holes is decreased, the spectral response range of TiO2 is widened, the sunlight utilization rate is improved from 6% to 35%, and the photocatalytic activity is enhanced.

Description

technical field [0001] The invention belongs to the technical fields of functional nanomaterial preparation and photocatalysis, and specifically relates to a photocatalyst, a preparation method and a use method thereof. Background technique [0002] Photocatalyst, also known as photocatalyst, is a general term for a class of chemical substances that can catalyze under the excitation of photons, and can degrade organic pollutants and other toxic substances into H 2 O and CO 2 , has the advantages of comprehensiveness, safety, high efficiency and durability. In heterogeneous photocatalysis, titanium dioxide (TiO 2 ) has been proven to be the most promising semiconductor catalyst today, with excellent chemical stability, high catalytic activity, safety and non-toxicity, good biocompatibility, and low cost. However, due to TiO 2 There is a wide bandgap and fast recombination of photogenerated electrons and holes in it, which seriously affects its utilization efficiency of vi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J35/08B01J35/10B01J21/18B01J27/22C02F1/30C02F101/38
CPCB01J21/18B01J27/22B01J35/004B01J35/023B01J35/08B01J35/1004C02F1/30C02F2101/40C02F2305/10
Inventor 张现峰吕长鹏芦静波徐少文阮耀文
Owner BENGBU COLLEGE
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