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Method for preparing nanocomposite photocatalyst and application of nanocomposite photocatalyst

A nanocomposite material and photocatalyst technology, which is applied in the field of hydrothermal synthesis of CdS/ZnS nanocomposite supported graphene oxide photocatalyst, can solve problems such as limitations, and achieve the advantages of simple operation, high-efficiency treatment technology, and green environmental protection treatment technology Effect

Inactive Publication Date: 2015-02-18
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Cadmium sulfide (CdS) is a typical II-VI piezoelectric semiconductor and semiconductor photosensitive material, with a large band gap (about 2.45eV) , is also a good solar cell window material and nonlinear optical material. Because of its excellent optical and electrical properties, it is widely used in various light-emitting devices, photovoltaic devices, optical detectors, photosensitive sensors and photocatalysis. However, the photocorrosion of CdS itself limits its application; " img-id="48652DEST_PATH_IMAGE004" / > is a wide bandgap semiconductor compound material, with a cubic phase gap of 3.7eV and a hexagonal phase gap of 3.8eV

Method used

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  • Method for preparing nanocomposite photocatalyst and application of nanocomposite photocatalyst
  • Method for preparing nanocomposite photocatalyst and application of nanocomposite photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0033] Preparation of graphene oxide:

[0034] Add 1g of natural graphite and 2.5g of sodium nitrate into a three-necked flask filled with 30g of concentrated sulfuric acid, place in an ice bath, slowly add 4g of potassium permanganate while stirring, and keep at 15°C for 2h. Then heated in a water bath at 35 °C and stirred for 30 min. The solution turned dark green and bubbles were formed at the same time. Add 40 ml of distilled water to the solution and set the heating temperature of the water bath to 98 °C for 40 min. Add 140ml of distilled water to terminate the reaction, then add 10g, 30% hydrogen peroxide aqueous solution, the solution turns golden yellow, let it stand, pour off the supernatant, and use concentrated hydrochloric acid and water to mix the mixture at a volume ratio of 1:10 Washing, stirring for 30 minutes, standing still, pouring off the supernatant, washing with distilled water until neutral, and drying in a vacuum oven to obtain graphene oxide.

Embodiment 2

[0036] (1) Take by weighing 0.0026g of graphene oxide obtained in Example 1 and add deionized water to ultrasonic vibration until completely dissolved to form a homogeneous solution; add 0.0416g cadmium chloride and 0.0248g zinc chloride, stir until completely dissolved, Add 0.1756g of L-cysteine ​​and stir until it is completely dissolved. After fully stirring, adjust the pH of the solution to 7 with 1mol / L sodium hydroxide solution, then add 0.0876g of sodium sulfide to the above solution, and stir for 15 minutes with nitrogen gas , poured into a 50mL autoclave at 180 o C for 1 h, take out and cool naturally, centrifuge the cooled solution, wash and put it in a vacuum drying oven at 50°C for 6 h, dry it and grind it to obtain a CdS / ZnS nanocomposite supported graphene oxide photocatalyst.

[0037] (2) Take the sample in (1) and carry out the photocatalytic degradation test in a 0.05g photochemical reaction apparatus. It is measured that the degradation rate of the photocatalys...

Embodiment 3

[0039] By the steps in Example 2, the difference is that (1) selects the amount of graphene oxide 0.0053g, wherein the quality of cadmium chloride, zinc chloride, L-cysteine, sodium sulfide is constant, after the reaction finishes Take it out and let it cool naturally, centrifuge the cooled solution, wash it and put it into a vacuum drying oven to dry and grind it to obtain a photocatalyst.

[0040] (2) Take 0.05 g of the sample in (1) and conduct photocatalytic degradation test in a photochemical reaction apparatus. It is measured that the degradation rate of the prepared photocatalyst to 10 mg / L tetracycline antibiotic reaches 82.06% within 60 min.

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Abstract

The invention belongs to the technical field of preparation of environmental materials, in particular to a method for preparing a nanocomposite photocatalyst and application of the nanocomposite photocatalyst. The method comprises the following steps: weighing graphene oxide, putting the graphene oxide in a certain amount of deionized water, and performing ultrasound concussion until complete dissolution; respectively adding cadmium chloride and zinc chloride into a graphene oxide solution, and stirring to dissolve and then adding L-cysteine to continue to stir until complete dissolution; then regulating pH to 7 with a sodium hydroxide solution, and adding sodium sulfide and then introducing nitrogen to stir for 10-15min; pouring the solution into a high-pressure reactor, then putting in a high-temperature oven for heat preservation, and finally taking out for natural cooling; after centrifuging, washing and drying the reacted solution, grinding, and thus obtaining the CdS / ZnS nanocomposite photocatalyst loaded with graphene oxide. The prepared CdS / ZnS nanocomposite photocatalyst loaded with graphene oxide can effectively utilize visible light to degrade tetracycline in antibiotic wastewater.

Description

technical field [0001] The invention belongs to the technical field of environmental material preparation, and relates to the synthesis of graphene oxide and the hydrothermal synthesis of CdS / ZnS nanocomposite material-loaded graphene oxide photocatalyst and its application. Background technique [0002] Antibiotics are chemical substances produced by certain microorganisms, animals and plants, substances that can inhibit the proliferation of microorganisms and other cells, and are widely used as drugs for treating various bacterial infections or inhibiting pathogenic microbial infections. Due to the irrational use of antibiotics, it has caused great harm to the environment. Taking tetracycline antibiotics as an example, many research reports have shown that antibiotics are widely present in soil, surface water, groundwater, sediment, urban sewage, and animal excrement oxidation ponds. Therefore, the elimination of environmental pollution caused by antibiotic residues in the...

Claims

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Application Information

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IPC IPC(8): B01J27/04C02F1/30C02F101/38
CPCY02W10/37
Inventor 汤艳峰霍鹏伟刘馨琳马长畅周明君闫永胜喻龙宝
Owner JIANGSU UNIV
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