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A visible light responsive cadmium telluride/titanium dioxide z-type photocatalyst and its preparation method and application

A titanium dioxide and photocatalyst technology, which is applied in the field of photocatalytic materials, can solve the problems of weakening the oxidation ability of photogenerated electron reducing ability, unfavorable and efficient photocatalytic degradation of organic pollutants, etc.

Active Publication Date: 2020-10-30
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there is still a problem that is not conducive to the realization of efficient photocatalytic degradation of organic pollutants in heterojunction photocatalysts, that is, the reduction ability of photogenerated electrons and the oxidation ability of holes are weakened. Holes are transferred to semiconductor materials with lower guide band and higher valence band respectively

Method used

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  • A visible light responsive cadmium telluride/titanium dioxide z-type photocatalyst and its preparation method and application
  • A visible light responsive cadmium telluride/titanium dioxide z-type photocatalyst and its preparation method and application
  • A visible light responsive cadmium telluride/titanium dioxide z-type photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of photocatalyst

[0026] (a) Preparation of NaHTe precursor solution:

[0027] Add 12.8mg of tellurium powder, 37.8mg of sodium borohydride, and 2mL of deionized water into a 25mL three-necked round-bottom flask, seal it, stir it magnetically, and pass nitrogen to protect it from oxygen until the tellurium powder is completely dissolved to obtain a clear NaHTe precursor solution. spare.

[0028] (b) CdTe / TiO 2 Photocatalyst preparation:

[0029] Add 250mg of titanium dioxide and 68mL of deionized water into a 150mL three-neck round-bottom flask, stir magnetically until the titanium dioxide powder is evenly dispersed in the water; then add 107mg of cadmium acetate, stir until dissolved; then add 53μL of mercaptopropionic acid, stir, seal, and ventilate with nitrogen In addition to oxygen; quickly inject 2mL of the NaHTe precursor solution prepared in step 1), and stir for 10 minutes; transfer the above-mentioned mixed solution to a high-pressure hydro...

Embodiment 2

[0039] (1) Preparation of photocatalyst

[0040] (a) Preparation of NaHTe precursor solution: same as Example 1

[0041] (b) CdTe / TiO 2 Photocatalyst preparation:

[0042] Unlike Example 1, the oven heating temperature is 140°C.

[0043] The method described in Example 1 was used to test the degradation activity of the photocatalyst prepared in this example to tetracycline under visible light irradiation. Its photocatalytic degradation efficiency after 30 minutes was 72%.

Embodiment 3

[0045] (1) Preparation of photocatalyst

[0046] (a) Preparation of NaHTe precursor solution: same as Example 1

[0047] (b) CdTe / TiO 2 Photocatalyst preparation:

[0048] The difference from Example 1 is: before injecting the NaHTe precursor solution, the mixed solution (containing TiO 2 ) pH value is adjusted to 4; the heating temperature in the oven is 140°C.

[0049] The method described in Example 1 was used to test the degradation activity of the photocatalyst prepared in this example to tetracycline under visible light irradiation. Its photocatalytic degradation efficiency after 30 minutes was 76%.

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Abstract

The invention discloses a visible light responsive cadmium telluride / titanium dioxide Z-type photocatalyst. The catalyst uses titanium dioxide as a carrier and carries cadmium telluride on the titanium dioxide. Mainly produced by hydrothermal method. The staggered conduction band / valence band distribution of cadmium telluride and titanium dioxide in the cadmium telluride / titanium dioxide Z-type photocatalyst of the present invention can promote the separation of photogenerated electrons and hole pairs; the Z-type photogenerated carrier transfer path enables electrons and holes to The holes have strong redox ability; the narrow band gap of cadmium telluride can enhance the visible light response ability of the cadmium telluride / titanium dioxide Z-type photocatalyst; thus the cadmium telluride / titanium dioxide Z-type photocatalyst has excellent visible light photocatalytic degradation activity of antibiotics. The preparation process of the present invention is simple, the conditions are mild, the operation is convenient, the cost is low, the process can be easily applied on a large scale, and it has broad application prospects in sewage treatment and other fields.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, and in particular relates to a visible light responsive cadmium telluride / titanium dioxide Z-type photocatalyst and a preparation method and application thereof. Background technique [0002] At present, the global environmental pollution problem is becoming more and more serious, and threatens the survival and development of human beings. The widespread application of textile printing and dyeing, petrochemicals, leather processing, and antibiotics in clinical medicine, aquaculture, and animal husbandry causes a large amount of toxic and harmful organic substances to be discharged into the water environment, and gradually accumulates to cause harm to the ecological environment and human health. Semiconductor photocatalysis technology degrades toxic and harmful organic pollutants at room temperature by absorbing and utilizing sunlight. Due to its advantages of low energy consumption, mild ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/057B01J37/10C02F1/30C02F101/34C02F101/38
CPCC02F1/30B01J27/0576B01J37/10C02F2305/10C02F2101/34C02F2101/38B01J35/39
Inventor 宫银燕吴育洁徐燕刘心娟李灿牛棱渊
Owner CHINA JILIANG UNIV