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
5 Cites 25 Cited by

AI-Extracted 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...
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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.

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Technology Topic

Examples

  • Experimental program(9)

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: 100mg ZIF-8/g-C 3 N 4 The complex was added to 100 mL of Rhodamine B aqueous solution with a concentration of 10 mg/L, stirred in the dark for 30 min, and then the photocatalytic degradation experiment was carried out under simulated sunlight. The photodegradation time lasted for 60 min. During the process, 4 mL of the solution was pipetted every 10 min. Degradation rate. Use the same method for g-C 3 N 4 Calculate the degradation rate. The results showed that the ZIF-8/g-C 3 N 4 The photocatalytic degradation rate of rhodamine B by the complex was 89.7%, 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 was increased by 176%.

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 Scheme 3 increased by 138% 3 N 4 The photocatalytic degradation rate of rhodamine B by the composite was 84.6%, and 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 was increased by 160%.
[0034] Embodiment 4: hydrothermal reaction time to ZIF-8/g-C 3 N 4 Influence of the photocatalytic properties of the composites
[0035] According to the technical scheme of embodiment 1, wherein the hydrothermal reaction time is 12h and 18h, scheme 1 and scheme 2 are respectively, and other data are the same as those of embodiment 1.
[0036] 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 80.5%, 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 147% 3 N 4 The photocatalytic degradation rate of rhodamine B by the complex was 95.4%, 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 was increased by 193%.
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