Cobaltosic oxide nanosheets for arsenic removal of water body and preparation method and application
A technology of cobalt tetroxide nanometer and cobalt tetroxide, which is applied in chemical instruments and methods, cobalt oxide/cobalt hydroxide, nanotechnology and other directions to achieve the effects of stable structure, broad application prospects and efficient adsorption
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Embodiment 1
[0034] Embodiment 1: the preparation of tricobalt oxide nanosheet
[0035] 0.9517g CoCl 2 .6(H 2 O) Disperse in 100mL ultrapure water, stir fully for 10 minutes to make CoCl 2 .6(H 2 O) Completely dissolve to form a uniform pink solution, then slowly add ammonia water dropwise until the pH of the solution is 9.2, the solution turns dark green, continue to stir for 30 minutes, adjust the temperature of the solution to 80°C and continue to stir for 70 minutes, during which 10mL 30% hydrogen peroxide solution was slowly added dropwise to the above solution, and after cooling to room temperature, the resulting suspension was centrifuged at 9500rpm for 5 minutes, and the resulting precipitate was cross-washed several times with ultrapure water and ethanol until the pH was neutral , dried in a vacuum oven at 60°C for 24 hours to obtain a black powder, which was made into cobalt tetraoxide nanosheets (Co 3 o 4 NSs).
Embodiment 2
[0036] Embodiment 2: the preparation of tricobalt oxide nanosheet
[0037] 0.714g CoCl 2 .6(H 2 O) Disperse in 100mL ultrapure water, stir fully for 10 minutes to make CoCl 2 .6(H 2 O) Completely dissolve to form a uniform pink solution, then slowly add ammonia water dropwise until the pH of the solution is 9.0, the solution turns dark green, continue to stir for 30 minutes, adjust the temperature of the solution to 75°C and continue to stir for 60 minutes, during which 10mL 30% hydrogen peroxide solution was slowly added dropwise to the above solution, and after cooling to room temperature, the obtained suspension was centrifuged at 8000rpm for 10 minutes, and the obtained precipitate was cross-washed several times with ultrapure water and ethanol until the pH was neutral , dried in a vacuum oven at 60°C for 20h to obtain a black powder, which was made into cobalt tetraoxide nanosheets (Co 3 o 4 NSs).
Embodiment 3
[0038] Embodiment 3: the preparation of tricobalt oxide nanosheet
[0039] 1.190g CoCl 2 .6(H 2 O) Disperse in 100mL ultrapure water, stir fully for 10 minutes to make CoCl 2 .6(H 2 O) Completely dissolve to form a uniform pink solution, then slowly add ammonia water dropwise until the pH of the solution is 9.5, the solution turns dark green, continue to stir for 30 minutes, adjust the temperature of the solution to 85°C and continue to stir for 90 minutes, during which 10mL 30% hydrogen peroxide solution was slowly added dropwise to the above solution, and after cooling to room temperature, the obtained suspension was centrifuged at 11000rpm for 3 minutes, and the obtained precipitate was cross-washed several times with ultrapure water and ethanol until the pH was neutral , dried in a vacuum oven at 60°C for 30h to obtain a black powder, which was made into cobalt tetraoxide nanosheets (Co 3 o 4 NSs).
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