Preparation of magnetic nano-manganese iron oxyhydroxides and its application in catalytic ozone oxidation for pollution removal
An oxyhydroxide, magnetic nanotechnology, applied in metal/metal oxide/metal hydroxide catalyst, oxidized water/sewage treatment, physical/chemical process catalyst, etc., can solve the problem of unstable catalytic performance, poor catalytic activity, The problem of limited catalytic active points, etc., achieves the effect of short preparation cycle, low cost and easy operation.
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[0026] The preparation steps of the magnetic nano-manganese iron oxyhydroxide catalyst will be described below in conjunction with specific embodiments, so as to further understand the invention. The technical solution of the present invention is not limited to the specific embodiments listed below, but also includes any combination of the specific embodiments.
specific Embodiment approach 1
[0027] Specific embodiment one: the preparation method of magnetic nano-manganese iron oxyhydroxide catalyst is carried out according to the following steps
[0028] (1) Accurately weigh 6.275g (0.025mol) manganese nitrate tetrahydrate, 20.2g (0.05mol) ferric nitrate nonahydrate, completely dissolve in 100mL deionized water to obtain a clear solution, and place it still for 0.5 hours;
[0029] (2) Accurately weigh 80g (2mol) of sodium hydroxide and completely dissolve it in 250mL of deionized water;
[0030] (3) Add 75 mL of NaOH solution dropwise to the mixed solution of manganese nitrate and ferric nitrate to adjust the pH value of the mixed solution to between 7 and 8 to form a suspension with precipitation;
[0031] (4) Heat the above suspension to 90.0°C, and age at this temperature for 2h;
[0032] (5) Wash the aged suspension, the specific process is: dump the supernatant, add deionized water and stir to clean the sediment in the suspension, then cover the bottle mouth a...
specific Embodiment approach 2
[0036] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the 6.275g (0.025mol) Mn(NO 3 ) 2 4H 2 O was replaced by 7.27g (0.025mol) Ni(NO 3 ) 2 ·6H 2 O, other steps and parameters are the same as the specific embodiment one, that is, the magnetic nano-nickel-iron oxyhydroxide catalyst (NiFe 2 (OH) 8 , MFOH) preparation method.
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