Preparation method for carbon nitride visible-light-induced photocatalyst
A catalyst and visible light technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of difficult reaction process, control and intense reaction process, and many influencing factors, so as to shorten the reaction time. Time, excellent visible light catalytic hydrogen production performance, and the effect of increasing the reaction rate
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Embodiment 1
[0040] Mix 1.356 g of lithium chloride and 1.644 g of potassium chloride evenly as molten salt (melting point of molten salt: 353°C), add 1.26 g of melamine; after grinding for 20 minutes, put the above solid mixture into an alumina ceramic crucible (capacity 20ml). Place the crucible in the middle of the microwave muffle furnace, and carry out microwave heat treatment in the air environment: raise the temperature from room temperature to 550°C at a rate of 10°C / min, and keep it warm for 30 minutes; after cooling, heat the obtained solid at 50°C After washing with water several times, potassium chloride and lithium chloride were dissolved, and dried at 80°C for 12 hours to obtain a carbon nitride visible light catalyst with a yield of 56%.
[0041]In this embodiment, the mass ratio of melamine to molten salt is 42:100, and the molar ratio of lithium chloride to potassium chloride is 59.2%:40.8%.
[0042] The digital photographs of the obtained samples are as figure 1 As show...
Embodiment 2
[0046] Mix 1.356g of lithium chloride and 1.644g of potassium chloride evenly as molten salt (melting point of molten salt: 353°C), add 1.26g of melamine, grind for 20min, and put it into a 20ml ceramic crucible; place the crucible in a microwave oven The middle position of the furnace is heat treated according to the following temperature system: the heating rate is 10°C / min, the working temperature is 580°C, and the holding time is 45min. The obtained sample was washed with hot water at 80°C and dried at 80°C for 12 hours to obtain a carbon nitride visible light catalyst with a yield of 54%.
[0047] In this embodiment, the mass ratio of melamine to molten salt is 42:100, and the molar ratio of lithium chloride to potassium chloride is 59.2%:40.8%.
[0048] The scanning electron micrograph of gained carbon nitride visible photocatalyst is as Image 6 As shown, it is generally formed by a slight agglomeration of sheet-like structures, and there are accumulations of small pie...
Embodiment 3
[0051] Mix 1.1043g of lithium chloride and 1.8957g of potassium chloride evenly as molten salt (melting point of molten salt: 450°C), add 1.26g of melamine, grind for 20min, and put it into a 20ml ceramic crucible. The crucible was placed in the middle of the microwave muffle furnace, and heat treated according to the following temperature regime: the heating rate was 10°C / min, the working temperature was 550°C, and the holding time was 30 minutes; the obtained sample was washed with hot water and dried at 80°C After 12 hours, a carbon nitride visible photocatalyst was obtained with a yield of 55%.
[0052] In this embodiment, the mass ratio of melamine to molten salt is 42:100, and the molar ratio of lithium chloride to potassium chloride is 50.6%:49.4%.
[0053] The scanning electron micrographs of the obtained samples are as follows: Figure 9 As shown, its transmission electron microscope picture is shown as Figure 10 shown. The obtained sample is in the form of flakes...
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