改性吸水树脂的制备及其在土壤中的降解性能OA

In this study,acrylic acid was used as a monomer to prepare a superabsorbent poly-mer(SAP)via solution polymerization.Five biodegradable SAPs were synthesized by modif-ying the resin with small—molecule compounds(DOM,glucose,glutamic acid,inositol,and phytic acid).The effects of these modifiers on the water absorption/retention properties,Cd adsorption capacity,and soil degradation performance of the resins were systematically inves-tigated.Results demonstrated that compared with commercial SAP products,the modified resins exhibited significantly enhanced water absorption performance,with their water ab-sorption ratio increased by 1.30～2.45 times.However,the repeated water absorption per-formance of the modified resins decreased,and the water absorption capacity of the modified resins declined by up to 31.6％after three repeated uses,which was higher than the 8.6％decline of the commercial resin.Microbial degradation experiments revealed that the addition of modifiers reduced the stability of the resin network structure and enhanced microbial met-abolic utilization.The soil degradation process of the resins involved combined physical and biological mechanisms:External pressure gradually fractured the resins in soil,while microor-ganisms disrupted their three-dimensional network structure during burial,leading to molec-ular chain cleavage and subsequent microbial metabolism of small-molecule short-chain poly-mers.