Photoresponse oil-water separation filter paper and preparation method thereof

[0023] Example 1

[0024] (1) Preparation of glycidyl methacrylate-6-[4-(4-ethoxyphenylazo)phenoloxy]hexyl acrylate copolymer

[0025] According to the molar ratio, combine glycidyl methacrylate, 6-[4-(4-ethoxyphenylazo)phenoloxy]hexyl acrylate, and initiator azobisisobutyronitrile (AIBN) to 10 Mix and dissolve in a certain volume of anisole at a molar ratio of 90:1, and perform liquid nitrogen freezing-evacuating-nitrogen filling treatment on the reaction vessel, and the cycle is three times. Under the protection of nitrogen, the reaction vessel was placed in a constant temperature oil bath at 65°C, and reacted for 10 hours under electromagnetic stirring. After the system is cooled, add appropriate amount of tetrahydrofuran to dilute the product and precipitate in petroleum ether. After re-dissolving and precipitation, vacuum drying at room temperature for 24 h, glycidyl methacrylate-6-[4-(4-ethoxyphenylazo)phenoloxy]hexyl acrylate copolymer was obtained.

[0026] (2) In terms of weight ratio, combine 1g of silica particles with a particle size of 40-60 nanometers, 1.0g of glycidyl methacrylate-6-[4-(4-ethoxyphenylazo)phenoxy Base] hexyl acrylate copolymer, 0.2g ethylenediamine, 50mL tetrahydrofuran mixed, ultrasonic for 30min until uniform dispersion;

[0027] (3) Completely immerse the medium-speed qualitative filter paper (average pore diameter 30-50 microns) in the mixed solution, ultrasonically disperse for 30 seconds, and then take it out and dry it naturally for 24 hours.

[0028] (4) Oil-water separation experiment: The mixture of petroleum ether (boiling point 60~90℃) and deionized water (methylene blue dyeing) with a volume ratio of 1:2 was uniformly dispersed by ultrasonic, and poured into the filter paper obtained in step (3) above. The filtrate is a colorless transparent liquid (petroleum ether), and a blue transparent liquid (deionized water) remains in the filter paper. Use ultraviolet light to irradiate the remaining liquid in the filter paper. After 5-10 minutes, the blue liquid gradually penetrates the filter paper into the filtrate, and then pours the oil-water mixture into the filter paper. Only water is filtered out, and petroleum ether remains in the filter paper. The ultraviolet light was removed, the separation experiment was carried out under visible light, and it was restored to the original state: that is, the filtrate was petroleum ether, and the deionized water remained in the filter paper. The experiment can be repeated cycles.

[0029] Example 2

[0030] (1) Preparation of glycidyl methacrylate-6-[4-(4-ethoxyphenylazo)phenoloxy]hexyl acrylate copolymer

[0031] The preparation method is the same as in Example 1.

[0032] (2) In terms of weight ratio, combine 1.5g nano-silica particles (with a particle size of 20-60 nanometers), 1.0g glycidyl methacrylate-6-[4-(4-ethoxyphenylazo )Phenoxy]hexyl acrylate copolymer, 0.2g ethylenediamine, 50mL tetrahydrofuran mixed, ultrasonic for 30min until uniform dispersion;

[0033] (3) Completely immerse the medium-speed qualitative filter paper (average pore diameter 30-50 microns) in the mixed solution, ultrasonically disperse for 30 seconds, and then take it out and dry it naturally for 24 hours.

[0034] (4) The oil-water separation experiment is the same as in Example 1.

[0035] Example 3

[0036] (1) Preparation of glycidyl methacrylate-6-[4-(4-ethoxyphenylazo)phenoloxy]hexyl acrylate copolymer

[0037] The preparation method is the same as in Example 1.

[0038] (2) In terms of weight ratio, mix 2g of nano-silica particles (with a particle size of 50-100 nanometers) and 1.0g of glycidyl methacrylate-6-[4-(4-ethoxyphenylazo) Mix phenoloxy]hexyl acrylate copolymer, 0.2g ethylenediamine, 50mL tetrahydrofuran, and ultrasonic for 30min until uniformly dispersed;

[0039] (3) Completely immerse the medium-speed qualitative filter paper (average pore diameter 30-50 microns) in the mixed solution, ultrasonically disperse for 30 seconds, and then take it out and dry it naturally for 24 hours.

[0040] (4) The oil-water separation experiment is the same as in Example 1.