Bifunctional group MOFs material and preparation method and application thereof
A bifunctional group, tertiary amine group technology, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the structural damage of ZIF-8 adsorbent, heavy metal cations and harmful Anion removal and regeneration does not have problems such as evaluation research and stability degradation, so as to improve the efficiency and success rate of synthesis and preparation, solve the secondary pollution of regenerant, and the preparation process is simple and easy to operate.
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Example Embodiment
[0043] Example 1
[0044] First, the preparation method of carboxyl functionalized ZIF-8 (ZIF-8-COOH) is as follows: Weigh 2.933g zinc nitrate hexahydrate and 6.489g 2-methyl-1H-imidazole-4,5-dicarboxylic acid, respectively, Then add 200ml of methanol solution and stir vigorously for 2h, then centrifuge and wash 3 times with methanol and deionized water, and then vacuum dry at 40℃ for 24h to obtain ZIF-8-COOH white powder with in-situ functionalized carboxyl group (such as figure 1 Shown), with a carboxyl functional group.
[0045] The preparation steps of the bifunctional MOFs material in this embodiment are as follows:
[0046] Step 1: Grind the ZIF-8-COOH material. After the grinding is completed, add 0.5g of ZIF-8-COOH and 0.25g of DMAEA to 10ml of ethanol solution and stir evenly (the quality of ZIF-8-COOH and DMAEA) The ratio is 2:1), then slowly add 0.01g of AIBN (the amount of AIBN accounts for 1.3% of the total mass fraction of MOFs and DMAEA), stir at 50°C for 12h, and aft...
Example Embodiment
[0056] Example 2
[0057] The preparation steps of ZIF-8-COOH in this example are the same as in Example 1.
[0058] The bifunctional MOFs material (ZIF-8-COOH / R 2 The preparation steps of N) are as follows:
[0059] Step 1: Grind the ZIF-8-COOH material. After the grinding is completed, add 0.5g ZIF-8-COOH and 1g DMVBA to 20ml ethanol solution and stir evenly (the mass ratio of ZIF-8-COOH to DMVBA is 2: 4) Then slowly add 0.15g AIBN (the amount of AIBN accounts for 10% of the total mass fraction of MOFs and DMVBA), stir at 55°C for 12h, and after the ethanol is completely evaporated, the precursor A is obtained;
[0060] Step 2: Put the precursor A into an oven at 65° C. and dry it for 12 hours. After heating, the modified bifunctional MOFs material is obtained.
[0061] The bifunctional MOFs material prepared in this example (ZIF-8-COOH / R 2 N), the specific surface area is 800m 2 / g; average pore diameter of mesopores is 0.95nm; pore volume is 0.45cm 3 / g; The molar ratio of carboxyl...
Example Embodiment
[0067] Example 3
[0068] The preparation steps of ZIF-8-COOH in this example are the same as in Example 1.
[0069] The bifunctional MOFs material (ZIF-8-COOH / R 2 The preparation steps of N) are as follows:
[0070] Step 1: Grind the ZIF-8-COOH material. After the grinding is complete, add 0.5g of ZIF-8-COOH and 0.5g of DMAEA to 15ml of ethanol solution and stir evenly (quality of ZIF-8-COOH and DMAEA) The ratio is 1:1), then slowly add 0.05g of AIBN (the amount of AIBN accounts for 5% of the total mass fraction of MOFs and DMAEA), stir at 70°C for 12h, wait until the ethanol is completely volatilized to obtain precursor A;
[0071] Step 2: Put the precursor A in an oven at 70℃ and dry for 6 hours. After heating, the modified bifunctional MOFs material (ZIF-8-COOH / R 2 N).
[0072] The bifunctional MOFs material prepared in this example (ZIF-8-COOH / R 2 N), the specific surface area is 900m 2 / g; average pore diameter of mesopores is 1.05nm; pore volume is 0.504cm 3 / g; The molar ratio ...
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