Preparation And Adsorption Properties Of SA/GO-?-CD Composite Aerogel

The overall status of China's water environment has improved,but sewage treatment in some industries is not optimistic,and pollution is serious.Taking the textile industry as an example,printing and dyeing wastewater discharges a large amount,and the wastewater contains a large amount of toxic heavy metals,unreacted dyes,pigments,and carcinogenic and teratogenic organic compounds.Among the methods for removing pollutants,adsorption is a convenient,fast,cheap,and large-scale application method for pollutants removal,so it is important to prepare a cheap and efficient adsorbent.In this paper,sodium alginate(SA)and graphene oxide(GO)were used as raw materials,and a composite aerogel based on sodium alginate was prepared by sol-gel and freeze-drying methods.In this project,a graphene oxide sheet was first introduced into a sodium alginate aerogel to prepare a sodium alginate/graphene oxide(SA/GO)composite aerogel with excellent mechanical properties and a porous network structure.As an adsorbent,it adsorbs and removes heavy metal ions in simulated wastewater.However,the adsorption effect of the prepared SA/GO composite aerogel on heavy metal ions is limited,so this study further modified the graphene oxide.Because ?-cyclodextrin(?-CD)contains a large number of hydroxyl groups,the presence of these hydroxyl groups makes it able to react well with some metal ions to form inclusion complexes At the same time,based on the large specific surface area of graphene oxide,A functional SA/GO-?-CD composite aerogel was prepared by introducing functional?-CD on the surface of graphene oxide and blending it with sodium alginate.The adsorption effect of composite aerogel on heavy metal ions was studied.The research results show that the addition of graphene oxide tablets can not only improve the mechanical properties of SA/GO aerogels,but also improve the adsorption properties of aerogels.When the content of graphene oxide is 4wt%(that is,SA/GO-4),the mechanical properties of the composite aerogel are improved by 37.97%,and the adsorption performance of Cu2+is improved by 42.06%.The SA/GO-?-CD aerogels prepared by introducing ?-cyclodextrin on graphene oxide tablets have not changed much in mechanical properties,but SA/GO-?-CD-4 composite aerogels Compared with the adsorption performance of SA/GO-4 composite aerogel,the adsorption performance of Cu2+was increased by 40.65%.It reached129.12mg/g.It shows that SA/GO-?-CD-4 composite aerogel has excellent adsorption performance for metal ions.