Construction Of Polyoxometalates Modified Polymer Nanoarray And Its Adsorption Of Barium Ions

The separation and extraction of Cs~+ is of great significance for the high-value utilization of Qinghai Salt Lake resources.As a polyacid(POM)adsorbent,ammonium phosphomolybdate(AMP)has poor mechanical strength and is easily soluble in water,so it has no practical application value.In this paper,P(St-co-AA)with rigid structure,P(NIPAM-co-AA)with flexible structure,and nanoporous alumina(AAO)were synthesized as carriers,and AMP was grafted to three kinds by covalent bonding.The carrier acts as a Cs~+ adsorbent.Firstly,using AAO as a template,P(St-co-AA)-POM and(NIPAM-co-AA)-POM nanoflowers,tubes,wires,rods and other morphologies were obtained by infiltration method;secondly,in AAO as a carrier,AAO-POM was obtained by in situ grafting.By studying the effects of the amount of adsorbent,interference ions and other factors on the Cs~+ adsorption effect,the adsorption performance of Cs~+ and the adsorption effect in simulated brine environment were evaluated.The experimental results show that P(St-co-AA)-POM and(NIPAM-co-AA)-POM nanorod arrays have the best adsorption effect on Cs~+,with saturated adsorption rates of 88.65% and 84.52%,respectively,while AAO-POM The saturated adsorption rate was 83.68%,which was higher than that of AMP-supported Y zeolite(82%)reported in the literature.The adsorption rates of the three adsorbents under the interference ion environment reached 88.65%,84.52%,and 83.68%,respectively.Under simulated brine conditions,the adsorption rates reached 80.83%,83.64%,and 75.18%,respectively.The calculation results of the kinetic equations show that the adsorption processes of the three adsorbents all conform to the quasi-second-order kinetic model,indicating that the adsorption efficiency of the three adsorbents is controlled by the chemical adsorption mechanism and belongs to chemical adsorption.Using the three adsorption models of Langmuir,Freundlich and Temkin,fitting the adsorption data during the experiment,it is concluded that the adsorption performance of the three adsorbents meets the Freundlich adsorption model,indicating that the adsorption process of the three adsorbents exhibits multi-layer adsorption.feature.