Nano cerium manganese oxide/activated carbon composite material for room temperature oxidation of formaldehyde and preparation method thereof
A technology of composite materials and oxides, applied in the field of nano-cerium manganese oxide/activated carbon composite materials and its preparation, can solve the problems of easy detachment and deactivation, low loading capacity, poor binding force, etc., to improve hydrophobic performance and prevent agglomeration , the effect of increasing the load
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Embodiment 1
[0050] The preparation method of this embodiment is as follows:
[0051] Screen coconut shell granular activated carbon (1000mg / g iodine value) with mesh number 80-150, soak it in the mixed solution of 65-70wt% nitric acid and 98wt% sulfuric acid, and pretreat it at 80°C for 4h. After filtration, wash with deionized water several times until the pH is between 6 and 7, and dry in an oven at 120°C for 8 hours.
[0052] Get above-mentioned pretreated activated carbon 100g and polyvinylpyrrolidone 25g and add into deionized water under stirring (1000r / min). Then add 16g of melamine, stir at room temperature for 1 hour, and then ultrasonically treat at 60°C for 3 hours to obtain a brown gel. After standing for 1 hour, filter off the supernatant, wash with distilled water for 3 to 5 times, and transfer to an oven at 100°C after filtering. 1h to get xerogel. Then calcined in a muffle furnace at 500°C for 3h, and cooled to room temperature to obtain modified activated carbon particl...
Embodiment 2
[0055] The preparation method of this embodiment is as follows:
[0056] Coal-based granular activated carbon with a mesh number of 80-150 (iodine value 1200mg / g) was screened, soaked in a mixed solution of 65-70wt% nitric acid and 98wt% sulfuric acid, and pretreated at 80°C for 4 hours. After filtration, wash with deionized water several times until the pH is between 6 and 7, and dry in an oven at 120°C for 8 hours.
[0057] Take 100 g of the above-mentioned pretreated activated carbon and 20 g of polyethyleneimine and add them into deionized water under stirring (1000 r / min). Then add 16g of urea, stir at room temperature for 1 hour, and then ultrasonically treat at 60°C for 3 hours to obtain a brown gel. After standing for 1 hour, filter off the supernatant, wash with distilled water for 3 to 5 times, and transfer to an oven at 100°C after filtering. 1h to get xerogel. Then calcined in a muffle furnace at 500°C for 3h, and cooled to room temperature to obtain modified act...
Embodiment 3
[0060] Screen coconut shell granular activated carbon (1000mg / g iodine value) with mesh number 80-150, soak it in the mixed solution of 65-70wt% nitric acid and 98wt% sulfuric acid, and pretreat it at 80°C for 4h. After filtration, wash with deionized water several times until the pH is between 6 and 7, and dry in an oven at 120°C for 8 hours.
[0061] Get the above-mentioned pretreated activated carbon 100g and acrylic acid maleic anhydride copolymer 25g and add them into deionized water under stirring (1000r / min). Then add 20g of biuret, stir at room temperature for 1 hour, and then ultrasonically treat at 60°C for 3 hours to obtain a brown gel. After standing for 1 hour, filter off the supernatant, wash with distilled water for 3 to 5 times, and transfer to 100°C after filtration. Dry gel was obtained in oven for 1h. Then calcined in a muffle furnace at 500°C for 2h, and cooled to room temperature to obtain modified activated carbon particles.
[0062] 1.58g KMnO 4 (0.01...
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Abstract
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