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Preparation method of carbon nitride compound with high catalytic degradation activity

A technology of catalytic degradation and compound, which is applied in the field of photocatalyst preparation, can solve the problems of high charge carrier recombination rate, weakened photocatalytic activity, small specific surface area, etc., and achieve the effect of simple method, high practical application value, and accelerated migration rate

Inactive Publication Date: 2018-10-09
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the original g-C 3 N 4 The recombination rate of charge carriers is high, the conductivity is low, and the specific surface area is relatively small, so the g-C 3 N 4 own photocatalytic activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: ZIF-8 / g-C 3 N 4 Synthesis and Utilization of Compounds

[0026] (1) ZIF-8 / g-C 3 N 4 Synthesis of the composite: melamine was calcined at 550°C for 4 hours at a heating rate of 5°C / min in an air atmosphere to obtain the original g-C 3 N 4 . To 2.257g g-C 3 N 4 Add 20 mL of deionized water to the solution, and ultrasonically disperse for 1 h to obtain a suspension. Pour 10 mL of methanol solution containing 0.029 g of zinc nitrate hexahydrate into the above suspension, and stir for ten minutes, then add 20 mL of methanol solution containing 0.033 g of 2-methylimidazole, and continue stirring for 2 h; Transfer the homogeneous suspension to a 100mL high-pressure hydrothermal reaction kettle lined with polytetrafluoroethylene, keep it at 160°C for 24h, and cool it down to room temperature naturally. Drying for 8h under the hood, ZIF-8 / g-C was finally obtained 3 N 4 Complex;

[0027] (2)ZIF-8 / g-C 3 N 4 Complex photodegradation of organic pollutants: 1...

Embodiment 2

[0028] Embodiment 2: melamine calcining temperature is to ZIF-8 / g-C 3 N 4 Effect of the photocatalytic properties of the composites

[0029] According to the technical solution of Example 1, wherein the calcination temperature of melamine in the air atmosphere is 450° C. and 500° C. respectively, which are Scheme 1 and Scheme 2, and other data are the same as those of Example 1.

[0030] The results showed that the ZIF-8 / g-C of scheme 1 3 N 4 The photocatalytic degradation rate of rhodamine B by the complex was 57.6%, pure g-C 3 N 4The photocatalytic degradation rate of rhodamine B within 60min was 24.4%, which is characterized by comparison with g-C 3 N 4 The photocatalytic degradation rate of ZIF-8 / g-C increased by 136%. 3 N 4 The photocatalytic degradation rate of rhodamine B by the composite is 69.5%, pure g-C 3 N 4 The photocatalytic degradation rate of rhodamine B within 60min was 29.2%, which is characterized by comparison with g-C 3 N 4 The photocatalytic d...

Embodiment 3

[0031] Embodiment 3: hydrothermal reaction temperature is to ZIF-8 / g-C 3 N 4 Effect of the photocatalytic properties of the composites

[0032] According to the technical scheme of Example 1, wherein the hydrothermal reaction temperature is 120°C, 140°C, and 180°C are respectively Scheme 1, Scheme 2, and Scheme 3, and other data are the same as those of Example 1.

[0033] The results showed that the ZIF-8 / g-C of scheme 1 3 N 4 The photocatalytic degradation rate of rhodamine B by the composite was 66.1%, pure g-C 3 N 4 The photocatalytic degradation rate of rhodamine B within 60min was 32.5%, which is characterized by comparison with g-C 3 N 4 The photocatalytic degradation rate of ZIF-8 / g-C of Scheme 2 increased by 103%. 3 N 4 The photocatalytic degradation rate of rhodamine B by the composite was 77.4%, pure g-C 3 N 4 The photocatalytic degradation rate of rhodamine B within 60min was 32.5%, which is characterized by comparison with g-C 3 N 4 The photocatalytic ...

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PUM

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Abstract

The invention discloses a preparation method of carbon nitride compound with high catalytic degradation activity and belongs to the technical field of photocatalyst preparation. According to the preparation method disclosed by the invention, tripolycyanamide, zinc nitrate hexahydrate and 2-methylimidazole are utilized as raw materials, and ZIF-8 / g-C3N4 compound can be finally obtained through calcining and solvent heat treatment. Adsorption capacity of the synthesized ZIF-8 / g-C3N4 compound to organic pollutants is enhanced; meanwhile, service life of electron-hole pairs is prolonged, transferof photo-induced electrons is promoted, catalytic degradation activity to the organic pollutants is higher under the simulated sunlight, a degradation rate is 3.03 times of that of original g-C3N4, and higher practical application value is achieved.

Description

technical field [0001] The invention relates to a method for preparing a carbon nitride compound with high catalytic degradation activity, and belongs to the technical field of photocatalyst preparation. Background technique [0002] Carbon Nitride (g-C 3 N 4 ) has become one of the most widely studied semiconductor materials in photocatalytic technology due to its multiple properties such as non-toxicity, chemical stability, low cost, and favorable band edge position. However, since the original g-C 3 N 4 The recombination rate of charge carriers is high, the conductivity is low, and the specific surface area is relatively small, so the g-C 3 N 4 own photocatalytic activity. Therefore, many measures have been taken to overcome these limitations, such as the g-C 3 N 4 for structural design, g-C 3 N 4 Element doping, and construction based on g-C 3 N 4 Composite materials (Advanced Materials, 2015, 27, 2150-2176), etc., increase the specific surface area, prolong ...

Claims

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Application Information

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IPC IPC(8): B01J31/12B01J37/10B01J37/08B01J37/34C02F1/30C02F1/28C02F101/30
CPCC02F1/281C02F1/285C02F1/30B01J31/12B01J37/08B01J37/10B01J37/343C02F2305/10C02F2101/30B01J35/39
Inventor 刘湘张晶赵晗夏咏梅王海军
Owner JIANGNAN UNIV
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