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
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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 conductivit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

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

[0026] (1) ZIF-8 / g-C 3 N 4 Synthesis of the composite: melamine was heated to 550 °C for 4 h at a heating rate of 5 °C / min in an air atmosphere, and the original g-C was obtained. 3 N 4 . To 2.257g g-C 3 N 4 20 mL of deionized water was added to it, and ultrasonically dispersed 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, stir for ten minutes, then add 20 mL of methanol solution containing 0.033 g of 2-methylimidazole to it, and continue to stir for 2 h; The homogeneous suspension was transferred to a 100 mL high-pressure hydrothermal reactor containing a polytetrafluoroethylene lining, kept at 160 °C for 24 h, and cooled to room temperature naturally. After drying for 8h, 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: 100m...

Example Embodiment

[0028] Example 2: Melamine calcination temperature versus ZIF-8 / g-C 3 N 4 Influence of the photocatalytic properties of the composites

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

[0030] The results show 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 was 24.4% within 60 min, which was characterized by 3 N 4 The photocatalytic degradation rate of ZIF-8 / g-C of Scheme 2 increased by 136% 3 N 4 The photocatalytic degradation rate of rhodamine B by the complex was 69.5%, pure g-C 3 N 4 The photocatalytic degradation rate of rhodamine B was 29.2% within 60 min, which was characterized by 3 N 4 The photocatalytic degradation rate was increased by 138%. ...

Example Embodiment

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

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

[0033] The results show 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 was 32.5% within 60 min, which is characterized by 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 complex was 77.4%, pure g-C 3 N 4 The photocatalytic degradation rate of rhodamine B was 32.5% within 60 min, which is characterized by 3 N 4 The photocatalytic degradation rate of ZIF-8 / g-C of ...

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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
Inventor 刘湘张晶赵晗夏咏梅王海军
Owner JIANGNAN UNIV
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