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Preparation method and applications of AgBr/g-C3N4 composite powder

A composite powder, g-c3n4 technology, used in catalyst activation/preparation, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of narrow spectral response range, limited use range, low quantum efficiency, etc. Response range, improved photocatalytic activity, and high stability

Active Publication Date: 2018-12-04
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the narrow spectral response range, wide band gap, and low quantum efficiency of titanium dioxide and zinc dioxide, these photocatalysts cannot fully utilize sunlight, and can only degrade in the presence of ultraviolet light. reaction, which limits their use

Method used

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  • Preparation method and applications of AgBr/g-C3N4 composite powder
  • Preparation method and applications of AgBr/g-C3N4 composite powder
  • Preparation method and applications of AgBr/g-C3N4 composite powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] g-C 3 N 4 The preparation was divided into two groups of experiments, the difference between the two was only that the reaction time was 36h and 48h respectively, and the other process steps were exactly the same. Specific steps are as follows:

[0032] ①. Weigh 0.554g of cyanuric chloride, 0.189g of melamine and 0.2g of urea into a beaker, measure 15mL of acetonitrile reagent into the beaker, and stir with a glass rod for 5min to disperse;

[0033] ②. After the stirring is completed, pour the mixture into a 25mL reaction kettle, cover the reaction kettle and put it into a constant temperature blast oven, set the temperature at 180°C, and the reaction time is 36h and 48h respectively;

[0034] ③. After the reaction is completed, take out the reaction kettle, put the reaction substance in the reaction kettle into a 15mL plastic test tube; centrifuge with a centrifuge, and then wash 3 times with deionized water and absolute ethanol;

[0035] ④. Put the washed material ...

Embodiment 2

[0039] AgBr / g-C 3 N 4 Preparation of composite powder

[0040] Due to the lower success rate of rod-shaped carbon nitride, less yield, poorer dispersion than tubular carbon nitride and uneven appearance, tubular nitrogen was selected in the preparation process of composite powder and subsequent photocatalytic performance testing. Carbonized carbon (reaction time is 36 hours) is used as experimental raw material.

[0041] AgBr / g-C 3 N 4 The composite powder was prepared by ultrasonic method, using CTAB as a surfactant, using silver nitrate to provide silver ions, and changing AgBr and g-C 3 N 4 The mass ratio of AgBr is used to synthesize composite powders of different proportions. The mass fractions of AgBr are 5%, 10%, 15%, and 20%, respectively, and the samples shown in Table 1 are prepared accordingly; the following composite powder mass is 0.2 g, the preparation method steps are as follows:

[0042] ①. Weigh g-C 3 N 4 , silver nitrate, and CTAB are placed in a bea...

Embodiment 3

[0052] For tubular g-C 3 N 4 And the AgBr / g-C prepared by using tubular carbon nitride with AgBr loading of 20% 3 N 4 The composite powder was analyzed for crystal form. image 3 for g-C 3 N 4 XRD pattern. with C 3 N 4 Compared with the standard card PDF#87-1526, it can be seen that g-C appeared at 25.396°, 26.504°, and 40.303° respectively 3 N 4 The (101), (002), (111) diffraction peaks indicate that the prepared powder sample is carbon nitride.

[0053] Figure 4 is AgBr / g-C 3 N 4 XRD pattern. Compared with the standard card PDF#79-0149 of AgBr, it can be seen that the prepared AgBr / g-C 3 N 4 The composite powder has (111), (200), (220), (222) diffraction peaks at 26.715°, 30.944°, 44.328°, and 55.039° respectively, and the diffraction peaks are sharper, indicating better crystallinity. In the XRD spectrum of the prepared composite powder, the complete silver bromide diffraction peak can be clearly seen, and the diffraction peak of carbon nitride at 26.716° o...

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Abstract

The invention provides a preparation method and applications of AgBr / g-C3N4 composite powder, and relates to the technical field of composite powder preparation. The preparation method comprises following steps: adding cyanuric chloride, melamine, and urea into a beaker, measuring acetonitrile, pouring acetonitrile into the beaker, stirring to disperse acetonitrile; after stirring, pouring the mixture into a reactor, covering the reactor, placing the reactor in a temperature-constant blowing baking oven to carry out reactions; after reactions, filling generated substances into a plastic tube,carrying out centrifugation, washing, and drying to obtain rod shaped or tube shaped g-C3N4; weighing g-C3N4, silver nitrate, and CTAB, adding g-C3N4, silver nitrate, and CTAB into a beaker, adding anhydrous ethanol; carrying out reactions under the assistance of ultrasonic waves in the beaker, after reactions, pouring the reaction product into a plastic tube, and carrying out centrifugation, washing, and drying to obtain AgBr / g-C3N4 composite powder. The composite powder has a large specific surface area, the pore volume is 0.110 cc / g, the pore diameter is 17.171 nm, and the composite powderhas an excellent performance of degrading common organic dyes in the presence of visible light.

Description

technical field [0001] The invention relates to the technical field of composite powder preparation, in particular to an AgBr / g-C 3 N 4 Preparation method and application of composite powder. Background technique [0002] g-C 3 N 4 As a new type of metal-free photocatalytic material and traditional TiO 2 photocatalyst compared to g-C 3 N 4 The absorption spectrum range is wider, and it does not need ultraviolet light to play a photocatalytic effect under ordinary visible light; g-C 3 N 4 With a very suitable semiconductor band edge position, for the thermodynamically relevant conditions for the photolysis of water to produce hydrogen and oxygen, g-C 3 N 4 can also be satisfied. At the same time, with TiO 2 Compared to g-C 3 N 4 The role of activating molecular oxygen is also very obvious. In the research process, it is also shown that the superoxide radicals produced by carbon nitride also have a significant effect on the photocatalytic conversion of organic fun...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08B01J35/10C02F1/30C02F101/30C02F101/34C02F101/38
CPCC02F1/30B01J27/24B01J37/082C02F2101/308C02F2101/38C02F2101/34C02F2101/40C02F2305/10B01J35/613B01J35/633B01J35/647B01J35/39
Inventor 徐泽忠谢劲松陈思周彤彤
Owner HEFEI UNIV
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