Composite material with bismuth vanadate surface modified with nickel cobaltate spinel as well as preparation and application thereof
A technology of surface modification and composite material, which is applied in the field of composite materials of bismuth vanadate surface modified nickel cobaltate spinel, can solve the problems of limited application in the field of photochemistry, and achieves the advantages of industrial application, controllable structure and high absorption efficiency. Effect
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Embodiment 1
[0037] (1) Decahedral bismuth vanadate (BiVO 4 ) preparation, the specific steps are as follows:
[0038] Add 2.45g of bismuth nitrate and 0.7g of ammonium metavanadate into 35ml of 2mol / L dilute nitric acid, stir vigorously at room temperature, then take 6ml of ammonia water with a mass fraction of 25wt%, and add it dropwise to the above mixed solution, and stir until the solution becomes Light yellow (pH value 0.25~2), then transferred to a reaction kettle, reacted at 150~200°C for 18~36h, then washed the reaction product with water, and dried it in an oven to obtain BiVO 4 . The resulting BiVO 4 The TEM image of figure 1 As shown, the SEM image is shown in figure 2 As shown, it can be seen from the figure that the decahedral bismuth vanadate has been successfully prepared, and the size is uniform.
[0039] (2) Preparation of bismuth vanadate / nickel cobaltate spinel (BVO / NCO) composite material, the specific steps are as follows:
[0040] Take 50 mg of bismuth vanadat...
test Embodiment 1
[0043] The photocatalytic water oxidation performance test under visible light conditions, the specific steps are as follows:
[0044] The photocatalytic oxygen evolution activity of the BVO / NCO composite material obtained in Example 1 was evaluated by the LabSolar-6A (Perfilai, Beijing) photocatalytic online system. The BVO / NCO photocatalyst that the embodiment one of 50mg is obtained is dispersed in 100ml containing 85mgAgNO 3 and 200mg La 2 o 3 Ultrapure water, dispersed by ultrasound, then transferred to the reactor and sealed, then degas the reactor to remove the air in the system, after the end, inject 5ml of nitrogen into the reactor, using a 300W xenon lamp as a simulation Sunlight was used for performance testing, and O was analyzed by an online gas chromatograph (GC D7900P) with a TCD detector. 2 Spawn rate (every 0.5 hours). After the test, an oxygen standard curve was prepared, and the oxygen production rate of the BVO / NCO photocatalyst was obtained according t...
Embodiment 2
[0046] (1) Decahedral bismuth vanadate (BiVO 4 ) preparation, the specific steps are as follows:
[0047] Add 2.9g of bismuth nitrate and 1.1g of ammonium metavanadate into 20ml, in the dilute nitric acid of 5mol / L, vigorously stir at room temperature, then add ammonium bicarbonate solution dropwise in the above-mentioned mixed solution, stir until the solution becomes light yellow ( pH value 0.25~2), then transferred to the reaction kettle, reacted at 150~200°C for 18~36h, then washed the reaction product with water, and dried in an oven to obtain BiVO 4 .
[0048] (2) Preparation of bismuth vanadate / nickel cobaltate spinel (BVO / NCO) composite material, the specific steps are as follows:
[0049] Take 50mg of bismuth vanadate prepared above, and disperse it into a mixed solution containing 30ml of water and 50ml of ethanol, then add 12.5mg of nickel chloride, 30mg of cobalt chloride, 240mg of urea, and 240mg of cetyltrimethylammonium bromide In the above mixed solution, st...
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