Composite aerogel photocatalytic material and preparation method thereof
A technology of composite airgel and photocatalytic materials, which is applied in the field of cellulose/SiO2 composite airgel photocatalytic materials and its preparation, and can solve the problems of low absorption rate, high density, poor oil-water selectivity, etc.
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Embodiment 1
[0042] (1) Formation of hydrogel: At 30°C, add waste paper cellulose to a mixed solvent of dimethyl sulfoxide and ethanol at a ratio of 1:1, stir until the cellulose is evenly dispersed, and obtain waste paper cellulose water gel;
[0043] (2) Formation of solid gel: at 30°C, add methyltrimethoxysilane, oxalic acid, and deionized water into the cellulose hydrogel at a mass ratio of 6.8:0.45:7.2 and stir for 35 minutes Hydrolysis, to obtain solution A, in solution A, add composite airgel photocatalytic material mass fraction of 0.3% TiO 2 Granules, to obtain solution B, add ammonia water diluted with dimethyl sulfoxide to solution B, stir for 30 minutes for polycondensation to obtain solution C; heat solution C to 45°C for insulation, and obtain a solid gel;
[0044] (3) Aging of the solid gel: wash the solid gel with ethanol for 3 times within 24 hours, and then soak it in distilled water for 24 hours to complete the aging of the solid gel;
[0045] (4) Formation of airgel: ...
Embodiment 2
[0048] (1) Formation of hydrogel: At 30°C, add waste paper cellulose to a mixed solvent prepared by dimethyl sulfoxide and ethanol 9:1, stir until the cellulose is evenly dispersed, and obtain waste paper cellulose hydrogel glue;
[0049](2) Formation of solid gel: at 30°C, add methyltrimethoxysilane, oxalic acid, and deionized water into the cellulose hydrogel at a mass ratio of 6.8:1:9.2 and stir for 45 minutes. Hydrolyze to obtain solution A, and add 0.5% TiO doped with rare earth metals in the solution A 2 , to obtain solution B, add ammonia water diluted with dimethyl sulfoxide to solution B, stir for 40 minutes to carry out polycondensation to obtain solution C; heat solution C to 50°C for insulation, and obtain a solid gel;
[0050] (3) Aging of the solid gel: wash the solid gel with ethanol for 3 times within 24 hours, and then soak it in distilled water for 24 hours to complete the aging of the solid gel;
[0051] (4) Formation of airgel: freeze the aged solid gel a...
Embodiment 3
[0054] (1) Formation of hydrogel: at 30°C, add cellulose to a mixed solvent prepared by dimethyl sulfoxide and ethanol at a ratio of 5:1, stir until the cellulose is evenly dispersed, and obtain waste paper cellulose hydrogel;
[0055] (2) Formation of solid gel: at 30°C, add methyltrimethoxysilane, oxalic acid, and deionized water into the cellulose hydrogel at a mass ratio of 6.8:0.7:8 and stir for 37 minutes. Hydrolyze to obtain solution A, and add TiO doped with rare earth metals with a mass fraction of 0.6% of the composite airgel photocatalytic material in solution A 2 , to obtain solution B, add ammonia water diluted with dimethyl sulfoxide to solution B, stir for 48 minutes to polycondense to obtain solution C; heat solution C to 47°C for insulation, and obtain a solid gel;
[0056] (3) Aging of the solid gel: wash the solid gel with ethanol for 3 times within 24 hours, and then soak it in distilled water for 24 hours to complete the aging of the solid gel;
[0057] (...
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