▎ 摘　　要

NOVELTY - Preparing copper-graphene-acrylic acid composite gel comprises (i) using graphite oxide powder, add deionized water, and process it in an ultrasonic water bath with a power of 600 W and a frequency of 40 kHz to obtain a graphene oxide graphene oxide solution; (ii) measuring the acrylic acid solution, add the copper oxalate solution, adding it into an ultrasonic water bath with a power of 600W and a frequency of 40kHz, and allowing it to fully dissolve to obtain a mixed solution B; (iii) taking another acrylic acid solution, add an initiator, a crosslinking agent and a porogen in sequence, and magnetically stir for a period of time to obtain a mixed solution C; (iv) mixing the mixed solution B and the mixed solution C, adding the ultrasonically treated graphene oxide solution; (v) adding mixed solution D into a reaction vessel equipped with a condenser; (vi) using two-stage heating program and adjust the ultrasonic power at the same time: In the first stage. USE - The method is useful for preparing copper-graphene-acrylic acid composite gel. ADVANTAGE - The method ensures ammonia nitrogen adsorbed on the surface of the composite hydrogel and can desorb more than 98%, so as to realize the effective regeneration of the hydrogel. DETAILED DESCRIPTION - Preparing copper-graphene-acrylic acid composite gel comprises (i) using graphite oxide powder, add deionized water, and process it in an ultrasonic water bath with a power of 600 W and a frequency of 40 kHz to obtain a graphene oxide graphene oxide solution; (ii) measuring the acrylic acid solution, add the copper oxalate solution, adding it into an ultrasonic water bath with a power of 600W and a frequency of 40kHz, and allowing it to fully dissolve to obtain a mixed solution B; (iii) taking another acrylic acid solution, add an initiator, a crosslinking agent and a porogen in sequence, and magnetically stir for a period of time to obtain a mixed solution C; (iv) mixing the mixed solution B and the mixed solution C, adding the ultrasonically treated graphene oxide GO solution to obtain the mixed solution D; (v) adding mixed solution D into a reaction vessel equipped with a condenser, feeding condenser into cooling water, so that the reaction vessel is moved into an ultrasonic reactor filled with water; (vi) using two-stage heating program and adjust the ultrasonic power at the same time: In the first stage,where the ultrasonic power is 200 watts, the frequency is 40KHz, and the ultrasonic is heated from the initial water temperature of 40℃, and the temperature is raised from 40-50℃ within 5 minutes with a duration of 5 minutes, the ultrasonic power is 400 watts, the frequency is 40KHz, and the temperature is raised from 50-60℃ within 5 minutes, and the duration is 15 minutes to obtain copper-graphene-acrylic acid composite gel H-Cu- AA-GO.