Preparation method and application of carbon quantum dot/titanium dioxide composite photocatalyst

A technology of carbon quantum dots and titanium dioxide is applied in the field of preparation of carbon quantum dots/titanium dioxide composite photocatalyst, which can solve the problems of easy agglomeration of bismuth molybdate, difficult actual production, slow degradation rate, etc., and achieves the promotion of separation, low toxicity and degradation Efficient effect

CN110404524AInactive Publication Date: 2019-11-05WUHAN UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-11-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a preparation method of a carbon quantum dot / titanium dioxide composite photocatalyst. The preparation method comprises the following steps: S1, titanium alkoxide and anhydrous ethanol are taken, and are stirred uniformly to obtain a liquid A; S2, glacial acetic acid, distilled water and anhydrous ethanol are taken, and are stirred well to obtain a liquid B, the pH value of the liquid B is adjusted to 2-3, carbon quantum dots are added to the liquid B, and mixing is performed to uniformity in order to obtain a liquid B containing carbon quantum dots; S3, the liquid A is dropwise added to the liquid B containing carbon quantum dots at a certain temperature, and the obtained mixture is uniformly stirred and reacted to obtain a sol; and S4, the sol obtained in step 3is dried, then is taken out after the drying is completed, is ground, and is calcined to obtain the carbon quantum dot / titanium dioxide composite photocatalyst. The composite photocatalyst prepared inthe invention has the advantages of good effect and uniformity in compounding of the carbon quantum dots and titanium dioxide, and excellent photocatalytic performance.
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Description

technical field

[0001] The invention relates to the technical field of photocatalysts, in particular to a preparation method and application of a carbon quantum dot / titanium dioxide composite photocatalyst. Background technique

[0002] Titanium dioxide has many unique advantages, including stable chemical properties, excellent photoelectrochemical properties, light corrosion resistance, non-toxic to organisms, rich sources, and is an efficient photocatalyst, so it is often used for the degradation of organic pollutants, air Purification, sterilization and demister. Because titanium dioxide has a wide band gap of 3.2ev, it can only absorb ultraviolet light with a short wavelength, so its solar energy utilization rate is very low, only 3% to 5%, and due to the recombination of electrons and holes generated by photoexcitation, The light quantum efficiency is low, which limits its application in semiconductor photocatalysts.

[0003] Studies have found that carbon nanomateria...

Examples

Embodiment

[0034] Preparation of carbon quantum dots: carbon quantum dots were prepared by hydrothermal method. First take 0.1g coke powder, add mixed acid 16mL mixed acid (VH 2 SO 4 : VHNO 3 = 3:1), after being fully mixed, enter the condensing reflux device, adopt magnetic stirring, and carry out the reaction in an oil bath, the reaction temperature is 90°C, and the time is 8h. After the reaction, the reaction liquid was cooled, and centrifuged at a speed of 4000 r / min for 30 min with a desktop centrifuge to remove larger particles in the solution. Take the filtrate and adjust the pH between 3-9 with 5mol / L NaOH solution. Then put it into a dialysis bag for dialysis to get a relatively pure carbon quantum dot solution after removing impurity ions. Then place it in a freeze dryer for freeze-drying under reduced pressure to obtain pure brown solid carbon quantum dots.

[0035] Preparation of composite photocatalyst:

[0036] Measure 10 mL of butyl titanate with a completely dry gra...