Chitosan/acid-immobilized organically modified attapulgite composite proton exchange membrane and preparation method thereof
A technology of modifying attapulgite and proton exchange membrane, which is applied in electrochemical generators, fuel cells, electrical components, etc., and can solve the problems of no proton conductivity, poor proton conductivity, poor compatibility, etc., and achieve wide application Prospect, improvement of proton conductivity, effect of improved dispersibility
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[0036] A preparation method of the novel chitosan / phosphotungstic acid immobilized organically modified attapulgite composite proton exchange membrane, comprising:
[0037] According to the mass ratio of the organically modified attapulgite and chitosan immobilized by phosphotungstic acid to 2-30:100, the attapulgite and chitosan immobilized by phosphotungstic acid were prepared respectively. Wherein, the prepared chitosan is made into an acidic solution of chitosan.
[0038] Organically modified attapulgite loaded with phosphotungstic acid can be prepared by the following methods:
[0039] Dry the attapulgite raw material at 60-100°C for 4-10h, sieve the dried attapulgite, weigh the attapulgite raw material in acid solution, 40-100°C, magnetically stir for 1-5h, wash with distilled water until neutral (Check ion residue), dry at 50-100°C, grind into powder and save to obtain acidified attapulgite.
[0040] The acid solution is HCl solution and H 2 SO 4 One or mixed soluti...
Embodiment 1
[0069] The composite proton exchange membrane was prepared according to the mass ratio of phosphotungstic acid functionalized attapulgite to chitosan at 2:100.
[0070] Dry the attapulgite raw material at 80°C for 4 hours, pass the dried attapulgite through a 200-mesh sieve, weigh 10g of attapulgite raw ore in 100ml 2mol / L acid solution (H 2 SO 4 ), 60°C, magnetically stirred for 2h, washed with distilled water until neutral (BaCl 2 Detection of SO 4 2- existence), dried at 80°C, ground into powder and stored. Weigh 2g of attapulgite and add it to distilled water, after ultrasonic oscillation for 30min, add dropwise sodium hydroxide to adjust the pH value to 10, then add dropwise 15ml DC5700, ultrasonically shake at 70°C for 2h, then intermittently shake for 12h, wash with water, wash with ethanol to remove the solvent, 80 ℃ drying to obtain quaternized attapulgite. Weigh 0.5g of quaternized attapulgite and add it to 50-100ml of ethanol and water (volume ratio: 1:1) mixtu...
Embodiment 2
[0075] The composite proton exchange membrane was prepared according to the mass ratio of attapulgite loaded with phosphotungstic acid to chitosan was 4:100.
[0076] Dry the attapulgite raw material at 70°C for 6 hours, pass the dried attapulgite through a 200-mesh sieve, weigh 10g of ATP raw ore in 50ml of 2mol / L acid solution (H 2 SO 4 ), 70°C, magnetically stirred for 1h, washed with distilled water until neutral (BaCl 2 Detection of SO 4 2- existence), dried at 70°C, ground into powder and stored. Weigh 2g of attapulgite and add it to distilled water, after ultrasonic oscillation for 30min, add dropwise sodium hydroxide to adjust the pH value to 11, then add dropwise 10mlDC5700, ultrasonically shake at 70°C for 2h, then intermittently shake for 24h, wash with water, wash with ethanol to remove the solvent, 80 ℃ drying to obtain quaternized attapulgite. Weigh 0.1g of quaternized attapulgite and add it to 50-100ml of ethanol and water (volume ratio: 1:1) mixture, ultra...
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