Fabrication Of Marine Natural Polymer Composite Materials For PPCPs Adsorption

Residual drugs and personal care products?PPCPs?in water pose a serious threat to human health.Therefore,it is important to study methods for efficient removal of PPCPs.Based on natural polymer materials such as chitosan,nanocrystalline cellulose and sodium alginate,magnetic aminated chitosan,nanocrystalline cellulose/chitosan composite microspheres and UiO-66/sodium alginate composite were prepared.Microspheres were studied for their adsorption properties of diclofenac sodium?DS?and Levofloxacin?LOFX?.The main research contents and results are as follows:?1?Based on the natural polymer material chitosan,a magnetic aminated chitosan?AmCS?composite was prepared and its adsorption performance of diclofenac sodium?DS?was studied.AmCS@Fe₃O₄ composite microspheres were characterized by FT-IR,TEM,SEM,VSM,XRD and TGA.The effects of pH,initial concentration of DS and amount of adsorbent on the adsorption capacity were studied.The results show that the adsorption process is consistent with the Langmuir adsorption isotherm model and the quasi-secondary kinetic model.The maximum adsorption capacity of the material reached 469.48 mg/g.The AmCS@Fe₃O₄ composite microspheres maintained good adsorption characteristics after four cycles of continuous recycling,and the removal rate exceeded 70%.?2?A double-layer ethylenediamine?ED?modified nanocrystalline cellulose?CNC?/chitosan?CS?microsphere CNC-ED@CS-ED was prepared and the process of adsorbing diclofenac sodium was studied.The morphology and surface composition of the adsorbent were characterized by FT-IR?TEM?SEM?XPS and XRD.The results show that CNC-ED@CS-ED is chemical adsorption for DS adsorption process,and the adsorption process conforms to the Langmuir adsorption isotherm model.The maximum adsorption capacity is 444.44 mg/g,and CNC-ED@CS-ED has good adsorption capacity.After five consecutive cycles of use,the removal rate remained at 80.06%.?3?Based on sodium alginate and MOF material UiO-66,a UiO-66/sodium alginate composite microsphere was prepared,and the process of adsorbing levofloxacin?LOFX?was explored.The microspheres were characterized by FT-IR,SEM,XRD and TGA.The adsorption conditions were optimized and the adsorption mechanism was discussed.The results show that the adsorption process accords with the Langmuir adsorption isotherm model and the quasi-secondary kinetic model.The adsorption equilibrium time is 120 min and the maximum adsorption capacity is 86.43 mg/g.