Method for preparing Co3V2O8 with different morphologies by controlling hydrothermal time and Co3V2O8 with morphologies
A technology of heat time and water control, applied in chemical instruments and methods, inorganic chemistry, cobalt compounds, etc., to achieve the effect of strong controllability
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[0048] Example 1
[0049] (1) Add ammonium metavanadate to deionized water at 70°C and continue to stir for 5 minutes, the solution turns to light yellow-green;
[0050] (2) Add NaOH to the solution and continue to stir for about 5 minutes until the solution becomes transparent and colorless;
[0051] (3) CoCl 2 ·6H 2 O was added to the above solution and kept stirring for 10 minutes until the solution became transparent and reddish brown, where the molar ratio of Co:V was 1:3, and the concentration of OHˉ was 0.03mol / L;
[0052] (4) Transfer the above-prepared solution to a hydrothermal reactor, and react at a temperature of 160°C for a time range of 5min-16h;
[0053] (5) Take the reaction sample with the reaction time within 30 minutes;
[0054] (6) Cool the above reaction sample to room temperature, wash it several times with deionized water and absolute ethanol, dry it at 60℃ for 4h, put it in a tube furnace, calcinate to 250℃, keep it for more than 2h, and finally get Powdered Co ...
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[0055] Example 2
[0056] (1) Add ammonium metavanadate to deionized water at 80°C and continue to stir for 10 minutes, the solution becomes light yellow-green;
[0057] (2) Add LiOH to the solution and continue stirring for about 10 minutes until the solution becomes transparent and colorless;
[0058] (3) Co(NO 3 ) 2 ·6H 2 Add O to the above solution, and continue to stir for 10-15 minutes, until the solution turns into a transparent reddish brown, where the molar ratio of Co:V is 1:5.5, and the concentration of OHˉ is 0.035mol / L;
[0059] (4) Transfer the above-prepared solution to a hydrothermal reaction kettle, and react at a temperature of 220°C for a time range of 5min-16h;
[0060] (5) Take a reaction sample with a reaction time of 1-3h,
[0061] (6) Cool the above reaction sample to room temperature, wash it several times with deionized water and absolute ethanol, dry it at 90℃ for 6h, put it in a tube furnace, calcinate to 350℃, keep it for more than 2h, and finally get Regula...
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[0062] Example 3
[0063] (1) Add ammonium metavanadate to deionized water at 75°C and continue to stir for 7 minutes, the solution becomes light yellow-green;
[0064] (2) Add KOH to the solution and continue stirring for about 8 minutes until the solution becomes transparent and colorless;
[0065] (3) Co(Ac) 2 ·4H 2 O was added to the above solution and kept stirring for 12 minutes until the solution became transparent red-brown, in which the molar ratio of Co:V was in the range of 1:4, and the concentration of OHˉ was in the range of 0.032mol / L;
[0066] (4) Transfer the above-prepared solution to a hydrothermal reaction kettle, and react at a temperature of 190°C for a time range of 5min-16h;
[0067] (5) Take a reaction sample with a reaction time of 3-6h;
[0068] (6) Cool the above reaction sample to room temperature, wash it several times with deionized water and absolute ethanol, dry it at 75℃ for 5h, put it in a tube furnace, calcinate to 300℃, keep it for more than 2h, and fi...
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