Preparation And Properties Of Lanthanum Ion Imprinted Polymer Based On GO

Rare earth elements refer to the lanthanide in the periodic table and yttrium(Y)and scandium(Sc),which are similar in nature and composed of 17 elements.They have unique photoelectromagnetic properties and are irreplaceable strategic resources.Lanthanum was discovered by Mosandel in 1839.Lanthanum is the second most abundant rare earth element in the earth's crust.It is the most active rare earth metal element with high chemical value.It has been widely used in petrochemical industry,biomedicine,agriculture,permanent magnetic materials and hydrogen storage materials.It is also used in aviation,automobile and other fields.Therefore,the use of the rare earth metal lanthanum is constantly expanding,and the quality requirements of products are constantly increasing.The future development prospects of lanthanum must be inestimable,and its value will also increase.China is a country with a large output of rare earths,and its mineral resources are very rich.Rare earth reserves can account for one-third of the world.In the southern region of China,there is a special rare earth,ion-adsorbed rare earth,This rare earth mine is not only rich in reserves but also relatively easy to mine.There are problems such as waste of resources and environmental pollution.The ability to efficiently recycle rare earth elements is a hot spot of concern today,and the adsorption method is a very simple and efficient method.It is widely used in the recovery and enrichment of metal ions,so this research and development of new materials that can efficiently recycle rare earth elements.Graphene oxide(GO)has unique physical and chemical properties,such as high specific surface are,rich oxygen-containing functional groups on the surface,good water dispersibility,etc.This makes it have a high potential to adsorb metal ions in sewage.Ion imprinting technology is a technique to synthesize materials that can highly select the target ion.This paper uses surface ion imprinting technology to combine ion imprinting polymer and graphene oxide.Three ion-imprinted polymers based on graphene oxide were prepared,and their adsorption properties for lanthanum ions were studied.The details are as follows:1.Prepared a lanthanum ion imprinted polymer La-IIP_PEI/GO with graphene oxide as the carrier,polyethyleneimine(PEI)as the functional monomer,and epichlorohydrin as the crosslinking agent.,and non-ion imprinted polymer La-NIP-PEI/GO.Made a series of characterizations.And the adsorption of lanthanum ions was studied,and the influence of pH,temperature and other adsorption conditions on the adsorption capacity of the adsorbent was explored.And did kinetic and thermodynamic analysis.The results show that La-IIP-PEI/GO adsorbs lanthanum ions better than GO.The adsorption process of the two belongs to chemical adsorption.The combination of lanthanum ions and the active sites on the surface of the adsorbent forms a monolayer adsorption.It is a process of endothermic and entropy increasing spontaneously.Then,GO and La-IIP-PEI/GO were subjected to selective experiments and desorption regeneration experiments.The results showed that GO had almost no selectivity for lanthanum ions,and La-IIP-PEI/GO had lanthanum ions.Certain selectivity.Both adsorbents are easy to elute and have good regeneration performance.2.A lanthanum ion imprinted polymer La-IIP-AM/GO with aminated graphene oxide as the carrier,acrylamide(AM)as the functional monomer and epichlorohydrin as the cross-linking agent was prepared and non-ion imprinted polymer La-NIP-AM/GO.Made a series of characterizations.And the adsorption of lanthanum ions was studied,and the effect of adsorption conditions on the adsorption capacity of the adsorbent was explored.And the kinetic and thermodynamic analysis of the experimental results.The results show that the adsorption process belongs to chemical adsorption and multilayer adsorption.It is a spontaneous,endothermic,entropy increasing process.Then,the selectivity and regeneration performance of La-IIP-AM/GO for lanthanum ions was studied.The results show that La-IIP-AM/GO has good selectivity for lanthanum ions,and also has good regeneration performance.3.A lanthanum ion imprinted polymer La-IIP-MAA/Fe3O4-GO and non-ferrous oxide with magnetic graphene oxide(Fe3O4-GO)as the carrier and methacrylic acid(MAA)as the functional monomer was prepared,and ion-imprinted polymer La-NIP-MAA/Fe3O4-GO.Made a series of characterizations.And studied its adsorption of lanthanum ions,to explore the best adsorption conditions.And did kinetic and thermodynamic analysis.It can be concluded that the adsorption process belongs to chemical adsorption and multilayer adsorption.The Gibbs free energy ?G in the adsorption process is less than 0,the enthalpy change ?H is greater than 0,and the entropy change ?S is greater than 0.It shows that the adsorption process is a spontaneous,endothermic and entropy increasing process.Then,a selective experiment and a repeatability experiment were carried out.The experimental results show that La-IIP-MAA/Fe3O4-GO has a good selectivity for lanthanum ions,and it can maintain 90%performance after repeated use for 5 times.It shows that the adsorbent has good stability and strong regeneration performance.