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g-CNQDs/GO composite photocatalysis material preparation method

A composite photocatalysis and protonization technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of unsolved secondary pollution of metal composite materials, low composite efficiency, and long time consumption , to achieve excellent photocatalytic effect, increase recombination efficiency, and solve the effect that is not easy to recombine

Active Publication Date: 2016-11-16
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0004] The existing composite materials related to graphite phase carbon nitride are mainly graphite phase carbon nitride in block, flake, and tubular form, and metal-based composite materials such as titanium and transition metals, which only partially improve the performance of metal-based materials. , did not solve the secondary pollution problem of metal composite materials to the environment
In addition, the current binary system composite methods mainly include hydrothermal method, one-step method, mechanical mixing method, etc. Among them, the hydrothermal method has higher requirements on experimental equipment, and the one-step method usually uses a more toxic organic solvent to provide a reaction environment, mechanical mixing The method takes a long time, the compounding efficiency is low, and it is unstable after compounding, and it is easy to fall off

Method used

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  • g-CNQDs/GO composite photocatalysis material preparation method
  • g-CNQDs/GO composite photocatalysis material preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Step 1: Preparation of Graphene Oxide

[0028] (1) In a 150ml beaker, add 18ml of concentrated sulfuric acid, 500mg of 8000 mesh graphite powder, and 2g of sodium nitrate, place the beaker in an ice-water bath, stir and react on a magnetic stirrer for 1 hour, then slowly add 3g of ground Potassium permanganate solid powder.

[0029] (2) After adding potassium permanganate, keep stirring in an ice-water bath for 2 hours, then raise the temperature to 35°C, and keep it for 1 hour. At this time, a large amount of purple smoke is generated, and then slowly add 40ml of deionized water to the reaction In the system, it takes about half an hour to complete the addition by controlling the rate of addition;

[0030] (3) After adding deionized water, transfer the beaker to an oil bath at 100°C, keep it for 15 minutes, take it out, wait for the reaction system to cool down to room temperature, add 70ml of deionized water, and then add 12ml of 30% hydrogen peroxide solution, At t...

Embodiment 2

[0042] The first step to the third step are the same as in Example 1. In the fourth step, the prepared graphene oxide powder is dispersed into 10ml of deionized water, and after stirring for 10min, 3ml of protonated g-CNQDs solution is added. Ultrasonic treatment at 40kHz and 140W power for 15min. Then, the mixture was taken out and left to stand for about 48 hours, and the final solution was dried in a vacuum oven at 60 degrees for 24 hours, and the product was collected and ground into powder. The obtained product was 3ml C3N4 / GO. Weighed 10mg of this product and used it to degrade 50ml of methyl orange solution with a concentration of 10PPm under visible light (λ>420nm). The degradation rate reached 64% after 100min.

Embodiment 3

[0044] The first step to the third step are the same as in Example 1. In the fourth step, the prepared graphene oxide powder is dispersed into 10ml of deionized water. After stirring for 10min, 5ml of protonated g-CNQDs solution is added. Ultrasonic treatment at 40kHz and 140W power for 15min. Then, the mixture was taken out and left to stand for about 48 hours, and the final solution was dried in a vacuum oven at 60 degrees for 24 hours, and the product was collected and ground into powder. The obtained product was 5ml C3N4 / GO. Weighed 10mg of this product and used it to degrade 50ml of methyl orange solution with a concentration of 10PPm under visible light (λ>420nm). The degradation rate reached 9.3% after 100min.

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Abstract

The present invention provides a g-CNQDs / GO composite photocatalysis material preparation method. The concrete scheme of the method comprises that graphite powder, urea and concentrated nitric acid are used as main raw materials, an electrostatic coupling method is used, and four steps such as oxidation of graphene, oxidation of graphite phase carbon nitride quantum dots, oxidation of protonated graphite phase carbon nitride quantum dots, and g-CNQDs / GO compounding are performed to prepare the graphite phase carbon nitride quantum dot / graphene oxide composite photocatalysis material. According to the present invention, the photocatalytic property test on the prepared composite photocatalysis material is performed with visible light ([lambda] is more than 420 nm), and the results of the degradation on rhodamine B, methyl orange and other organic dyes show that the composite photocatalyis material has the excellent photocatalytic performance under the visible light.

Description

technical field [0001] The invention relates to a preparation method of a g-CNQDs / GO composite photocatalytic material, specifically belonging to the technical field of photocatalytic composite materials. Background technique [0002] With the acceleration of our country's industrialization process, the problem of environmental pollution has attracted more and more attention from the people of the country and even the world. Environmental pollution has already caused a great threat to human health. How to invent a water treatment agent to efficiently degrade organic matter in wastewater, protect the environment, and maintain ecological balance is imminent. [0003] At present, many literatures are research reports on titanium dioxide. The synthesis method of titanium dioxide composite materials is relatively complicated and cumbersome, and there are many by-products. Secondly, the price of the titanium source used in the reaction is high, and there are also disadvantages su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/00C02F1/30B82Y40/00
CPCB82Y40/00C02F1/30B01J27/24B01J37/00C02F2305/10B01J35/40B01J35/61B01J35/39
Inventor 许秋华孙朝阳谢宇郭若彬陈玺茜凌云
Owner NANCHANG HANGKONG UNIVERSITY
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