Cadmium telluride quantum dot/titanium dioxide composite material and application thereof

A technology of cadmium telluride quantum dots and titanium dioxide, applied in other chemical processes, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of low utilization rate of sunlight, improve photocatalytic activity, expand application range, improve The effect of utilization

Active Publication Date: 2016-12-07
FIRST NEW MATERIAL TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to use visible light more effectively, people have proposed a method of doping semiconductor materials into titanium dioxide, but the composite materials of titanium dioxide and semiconductors in the prior art have very low utilization rate of sunlight

Method used

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  • Cadmium telluride quantum dot/titanium dioxide composite material and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0022] (1) The sodium tellurium hydride solution can be prepared by the following steps: according to the ratio of using 2mL deionized water and 0.6g tellurium powder for every 1.2g sodium borohydride, sodium borohydride is mixed with deionized water and tellurium powder, And heating in a water bath at a water bath temperature of 80° C. until the mixed solution becomes colorless and transparent, thereby preparing a sodium telluride hydride solution.

[0023] (2) After the above 180°C insulation for 48 hours, cool to room temperature first, then clean the obtained solid precipitate (preferably wash with water and then use ethanol to clean) and dry (preferably at 80°C drying), so as to obtain a clean and dry cadmium telluride quantum dot / titanium dioxide composite material.

[0024] Further, compared with the use of simple titanium dioxide as photocatalyst, the cadmium telluride quantum dot / titanium dioxide composite material provided by the present invention is obtained through...

Embodiment 1

[0027] A cadmium telluride quantum dot / titanium dioxide composite material is prepared by the following steps:

[0028] Step A: Purge the 50mL Erlenmeyer flask with nitrogen for 10 minutes, then weigh 1.2g of sodium borohydride and place it in the Erlenmeyer flask, then add 2mL of deionized water and 0.6g of tellurium powder, and set the temperature of the water bath at 80°C Heating in a water bath until the mixed solution becomes colorless and transparent, that is, a sodium telluride hydride solution is obtained.

[0029] Step B, under nitrogen protection environment, dissolve 0.35g cadmium chloride pentahydrate in 300mL deionized water, then add thioglycolic acid dropwise according to the molar ratio of cadmium chloride pentahydrate: thioglycolic acid=1:0.2~5, and use The NaOH solution of 1mol / L adjusts the pH value of mixed solution to alkaline, then according to cadmium chloride pentahydrate: the mol ratio of sodium telluride hydride=1:0.1~1 fast adds the sodium telluride ...

Embodiment 2

[0032] Respectively with titanium isopropoxide: the volume ratio of cadmium telluride quantum dot solution=1:2, 1:5, 1:10, 1:15, and according to the preparation step in the embodiment of the present invention 1, titanium isopropoxide is obtained The cadmium telluride quantum dot / titanium dioxide composite material whose volume ratio to the cadmium telluride quantum dot solution is 1:2, 1:5, 1:10, 1:15 respectively.

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Abstract

The invention discloses a cadmium telluride quantum dot / titanium dioxide composite material and the application thereof. The cadmium telluride quantum dot / titanium dioxide composite material is prepared through the following steps: cadmium chloride anhydrous is dissolved into ionized water, mercaptoacetic acid is gradually added drop by drop according to the 1 to (0.2-5) molar ratio of cadmium chloride anhydrous to mercaptoacetic acid, a NaOH solution is used for adjusting the pH value to be alkaline, then a sodium hydrogen telluride solution is added, heating reflux lasts for 1 to 24 hours, and a prepared cadmium telluride quantum dot solution with the quantum dot grain size of 1 to 20nm is prepared; titanium iso-propoxide is dissolved into ethyl alcohol according to the 1 to (2-15) volume ratio of the titanium iso-propoxide to the cadmium telluride quantum dot solution, the cadmium telluride quantum dot solution is gradually added drop by drop, and then 30-minute stirring and 48-hour water-bath heating are performed, so that the cadmium telluride quantum dot / titanium dioxide composite material is obtained. According to the material provided by the invention, photocatalytic activity under visible light irradiation can be improved greatly, the sunlight use ratio is increased, the application scope of the titanium dioxide is expanded, and the composite material is suitable for removing indoor formaldehyde.

Description

technical field [0001] The invention relates to the field of formaldehyde purification, in particular to a cadmium telluride quantum dot / titanium dioxide composite material and its application. Background technique [0002] With the improvement of living standards, a variety of modern furniture and a large number of new decorative materials are constantly pouring into the room. These decorative materials and furniture will continue to release formaldehyde for several years, which will cause great harm to human health. [0003] At present, the methods for purifying formaldehyde mainly include adsorption method, chemical removal method and photocatalytic degradation method. Compared with the adsorption method and chemical removal method, the photocatalytic degradation method has the characteristics of long duration of efficacy, no secondary pollution, and no harm to the environment and human body. Therefore, the use of photocatalytic degradation method to purify formaldehyde i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/72B01J20/30B01J20/06
CPCB01D53/8668B01D2255/20707B01D2255/802B01D2257/704B01D2259/81B01J20/0262B01J20/06
Inventor 余雪娇张仁哲
Owner FIRST NEW MATERIAL TECH DEV
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