Polyimide/silica nanometer heavy metal adsorption material and its preparation and regeneration method
A technology of silica and polyimide, which is applied in chemical instruments and methods, separation methods, filter regeneration, etc., can solve problems such as poor recycling rate, non-hydrophilicity, and poor heat resistance, and achieve a solution Poor dispersibility, good hydrophilicity and dispersibility, good heat resistance
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Embodiment 1
[0046] Under a nitrogen atmosphere, using PABZ and BPDA with a molar ratio of 1:1 as raw materials, first add the diamine monomer PABZ to N-methylpyrrolidone, stir at room temperature until it is uniformly dispersed, and then add the dianhydride monomer BPDA , continue to stir and react for 10 hours to obtain a BPDA / PABZ polyamic acid solution with a solid content of 10%, wherein the molar content of benzimidazole units is 50%; The base pyrrolidone was mixed according to the molar ratio of 1:4:1 and stirred at 40°C until the transparent sol of the silica precursor was obtained; The fraction is 10%, stirring and mixing evenly, and then stirring the mixed solution at 180° C. for co-heating precipitation reaction for 4 hours, filtering and drying.
[0047] The present invention has done following test investigation to present embodiment gained adsorption material:
[0048] 1) Dispersion status in water, see results figure 1 PI-10 in, and compared with the dispersion of the pol...
Embodiment 2
[0053] Under a nitrogen atmosphere, using PDA, PABZ and BPDA with a molar ratio of 5:5:10 as raw materials, first add the diamine monomers PDA and PABZ into N,N'-dimethylacetamide, and stir at room temperature Add the dianhydride monomer BPDA after it dissolves and disperses evenly, continue to stir and react for 8 hours to obtain a BPDA / PDA / PABZ polyamic acid solution with a solid content of 12%, wherein the molar content of the benzimidazole unit is 25%; Ethyl silicate, oxalic acid solution with pH=2 and N,N'-dimethylacetamide were mixed at a molar ratio of 1:4:1.5 and stirred at 50°C until a transparent sol of the silica precursor was obtained; BPDA / PDA / PABZ polyamic acid solution and the transparent sol of the silicon dioxide precursor are stirred and mixed uniformly according to the mass fraction of silicon dioxide being 50%, and then the mixed solution is stirred at 250° C. for co-thermal precipitation reaction for 3 hours, filtered, Just dry.
[0054] The adsorption c...
Embodiment 3
[0057] Under a nitrogen atmosphere, using ODA, PABZ and BPDA with a molar ratio of 3:7:10 as raw materials, first add the diamine monomers ODA and PABZ to N,N'-dimethylformamide, and stir at room temperature Add the dianhydride monomer BPDA after it dissolves and disperses evenly, continue to stir and react for 5 hours to obtain a BPDA / ODA / PABZ polyamic acid solution with a solid content of 15%, wherein the molar content of the benzimidazole unit is 35%; Ethyl silicate, nitric acid solution with pH=2 and N,N'-dimethylformamide were mixed at a molar ratio of 1:4:1.2 and stirred at 45°C until a transparent sol of the silica precursor was obtained; BPDA / ODA / PABZ polyamic acid solution and the transparent sol of the silicon dioxide precursor are stirred and mixed uniformly according to the mass fraction of the silicon dioxide being 30%, and then the mixed solution is stirred at 170° C. for co-thermal precipitation reaction for 3 hours, filtered, Just dry.
[0058] The adsorption...
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