Preparation Of Glycan Natural Polymer Derivatives And Their Enrichment And Separation Of U(?) And Th(?)

With the increasingly prominent of global energy and environmental problems,the low-carbon economic wave is coming.As a clean energy,nuclear energy has gained considerable development and strong support.In this paper,amidoximized chitosan and amidoximized cellulose were synthesized by one-step method,named amidoximized chitosan(AO-CTS)and amidoximized cellulose(AO-Cell).In addition,infrared spectroscopy(FT-IR),elemental analysis,scanning electron microscopy(SEM),thermogravimetric analysis(TGA)and other characterization methods were used to characterize its properties and structure in detail.This paper systematically studies the enrichment and separation performance of materials for U(?)and Th(?)in aqueous solution.The effects of two glycan natural polymer derivative adsorbent materials on the adsorption performance of U(?)and Th(?)under a series of factors such as pH,solid-liquid ratio,time,temperature,anion / cation strength,at the same time,the selectivity of two adsorbent materials for U(?)and Th(?),the desorption effect of different acids,desorption equilibrium time and adsorption-desorption behavior were studied.The results show that two modified materials AO-Cell and AO-CTS for adsorption of U(?)and Th(?)are strongly influenced by pH,solid-liquid ratio and time,but the effect of ionic strength is weak.Through the kinetic fit between the contact time t of the adsorbates U(?)and Th(?)and the adsorbent and the adsorption amounts qt of U(?)and Th(?)in the solid phase,the adsorption of U(?)and Th(?)by two adsorbent materials is mainly based on rapid equilibrium chemical adsorption,and the adsorption process is both endothermic reaction,that is,the temperature increase is conducive to the adsorption of U(?)and Th(?)by modified materials.When U(?)(Th(?))coexists with other metal ions at the same initial concentration,AO-CTS and AO-Cell have a certain selective adsorption for U(?)(Th(?)),among which the selectivity of AO-CTS for U(?)is better than AO-Cell,while both AO-CTS and AO-Cell all show goodselectivity for Th(?).Desorption kinetics studies have shown that AO-CTS and AO-Cell can desorb metal ions in a short time at a lower nitric acid concentration.These adsorbent materials were reused more than five times and maintain the adsorption rate of about 50%.From the research results,we can find that the one-step method modified natural glycan polymer materials have these characteristics of wide source of raw materials,simple synthesis method,fast adsorption speed,and reusable for separating U(?)and Th(?)from solution,providing data support for the separation of metal ions in solution by these similar materials.