Carbon dot and graphite phase carbon nitride compound photocatalyst as well as preparation method and application thereof
A technology of graphitic carbon nitride and composite light, which is applied in the field of photocatalysis, can solve the problems of ineffective use of solar energy, high recombination rate of photogenerated carriers, and low utilization rate of visible light, achieving high application prospects and use value, Improve the catalytic ability and inhibit the effect of recombination
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[0031] Example 1
[0032] A CDots / g-C 3 N 4 The preparation of the composite photocatalyst includes the following specific steps:
[0033] 1. Weigh 1g of glucose, add 0.2ml of ethylenediamine and 15ml of ultrapure water to it, dissolve by ultrasound and transfer to a polytetrafluoroethylene high temperature hydrothermal reactor to react at 160°C for 3h. After cooling to room temperature, a brown aqueous solution was obtained. The solution was centrifuged to remove large particles, dried and milled to obtain brown-black CDots powder.
[0034] 2. Weigh 3g of dimeric cyanamide and place it in an alumina crucible, add 0.01g of CDots powder and 15ml of ultrapure water to it, dissolve it by ultrasound and place it in an oven at 70°C, transfer the crucible to the muffle after the water is completely evaporated In the furnace, the temperature is increased to 500°C at a heating rate of 3°C / min and the temperature is maintained for 3 hours. After cooling to room temperature, mill and sieve t...
Example Embodiment
[0040] Example 2
[0041] A CDots / g-C 3 N 4 The preparation of the composite photocatalyst includes the following specific steps:
[0042] 1. Weigh 3g of glucose, add 0.6ml of ethylenediamine and 10ml of ultrapure water to it, dissolve by ultrasound and transfer to a polytetrafluoroethylene high-temperature hydrothermal reactor for reaction at 150°C for 5h. After cooling to room temperature, a brown aqueous solution was obtained. The solution was centrifuged to remove large particles, dried and milled to obtain brown-black CDots powder.
[0043] 2. Weigh 1g of dimeric cyanamide and place it in an alumina crucible, add 0.1g of CDots powder and 10ml of ultrapure water to it, dissolve it by ultrasound and place it in an oven at 70°C, transfer the crucible to the muffle after the water is completely evaporated The furnace was heated to 450°C at a heating rate of 2°C / min and kept at this temperature for 2 hours. After cooling to room temperature, mill and sieve to obtain CDots / g-C 3 N 4...
Example Embodiment
[0044] Example 3
[0045] A CDots / g-C 3 N 4 The application of composite photocatalyst in antibiotic wastewater treatment includes the following steps:
[0046] 1. Weigh 50mg of CDots / g-C prepared in 1 3 N 4 The composite photocatalyst was placed in the photolysis tube, 50ml of ciprofloxacin solution with a concentration of 4mg / L was added, and it was placed in a photochemical reactor to absorb light for 30 minutes.
[0047] 2. Use a 300w xenon lamp with a 290nm filter to perform the photocatalytic reaction, and use liquid chromatography to determine the concentration C of the remaining ciprofloxacin in the solution after 40 minutes of reaction. According to the formula N=(C 0 -C)*100% calculate the removal rate N of ciprofloxacin, where C 0 Is the initial concentration of ciprofloxacin.
[0048] 3. Weigh 50mg of g-C prepared in Comparative Example 1 3 N 4 , Repeat steps 1 and 2 to obtain the removal rate of ciprofloxacin by the catalyst.
[0049] Table 1 shows the CDots / g-C in Example...
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