光响应纤维素基印迹吸附材料的制备及光再生性能OA北大核心CSTPCD

The photoresponsive adsorption materials are of great significance to the light controlled release performance of pollutants and the development of green regeneration of adsorption materials.A photo-responsive cellulose based imprinted adsorbent(Cell-AB-MIP)was synthesized by surface-initiates atom transfer radical polymerization(SI-ATRP)using cellulose as raw material,azobenzene derivatives as functional monomers,and the typical pesticide residues 2,4-D as template.The synthetic conditions were optimized by single factor experiment,and the structure and performance of the material was analyzed by some characterization methods.The results show that the surface of Cell-AB-MIP contains abundant functional groups(—COOH,N=N,etc.),which have a high specific recognition effect for 2,4-D.The introduction of azobenzene group makes Cell-AB-MIP have excellent photo-induced regeneration performance.The azobenzene group on Cell-AB-MIP surface changes from trans-configuration to cis-configuration under UV irradiation,then changing the binding affinity of adsorbent for pollutants,thus realizing green regeneration via UV-light.The desorption efficiency can reach 72.22%in methanol medium under UV light irradiation.After 5 times of cycle,the adsorption percentage to 2,4-D still remains 83.47%.The analysis results of SEM and EA confirm that the adsorbed pollutants can be separated from the surface of the adsorbent after UV irradiation,completing the regeneration process.