Preparation method of carbon nitride compound with high catalytic degradation activity

[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%.

[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%.

[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%.