P-MOF-5@纤维素/聚丙烯非织造材料铅离子吸附性能研究

Study on adsorption property of lead ion for P-MOF-5@cellulose/polypropylene nonwovens

为了制备具有高效重金属铅离子吸附性能的纤维素/聚丙烯(纤维素/PP)复合水刺非织造材料,以六水合硝酸锌为金属离子源,对苯二甲酸为有机配体,聚乙烯吡咯烷酮(PVP10)为分散剂,采用溶剂热法在以纤维素与PP纤维混合比例为9∶1的水刺非织造材料表面原位合成了P‐MOF‐5@纤维素/PP,对制备材料形貌、结构、重金属铅离子(Pb^(2+))吸附性能和力学性能进行了表征。结果表明:在纤维素/PP表面合成的MOF‐5呈规则的正六面体,粒径分布不均,加入PVP10后,P‐MOF‐5的结构更规整、粒径更均匀,结晶结构完整;当Pb^(2+)初始质量浓度为50 mg/L、吸附温度为25℃、溶液pH值为5时,P‐MOF‐5@纤维素/PP对水体中Pb^(2+)的吸附性能最佳,吸附平衡时间为9 h,吸附效率约为95.04%;经5次重复循环使用后,复合水刺材料的吸附效率仍可达到70.84%;与纤维素/PP相比,P‐MOF‐5@纤维素/PP的拉伸强度和断裂伸长率略有下降。

In order to prepare cellulose/polypropylene(cellulose/PP)composite spunlaced nonwovens with high efficient heavy metal lead ion adsorption property,zinc nitrate hexahydrate was used as metal ion source,terephthalic acid was used as organic ligand,and polyethylene pyrrolidone(PVP10)was used as dispersant.Solvothermal method was adopted for P-MOF-5@cellulose/polypropylene in-situ synthesis of spunlaced nonwoven surface with 9∶1 mixing ratio of cellulose and PP fiber.The morphology,structure,adsorption property on heavy metal lead ion(Pb^(2+))and mechanical property of the prepared P-MOF-5@cellulose/PP were evaluated.The results showed that MOF-5 synthesized on the surface of cellulose/PP was a regular cube and the particle size distribution was uneven.After PVP10 was added,the structure of P-MOF-5 was more regular,the particle size was more uniform and the crystal structure was complete.When the initial mass concentration of Pb^(2+)was 50 mg/L,the adsorption temperature was 25℃,and the pH value of adsorption solution was 5,P-MOF-5@cellulose/PP had the best adsorption property for Pb^(2+)in the aqueous solution.The adsorption equilibrium time was 9 hours,and the adsorption efficiency was approximately 95.04%.After five repeated cycles,the Pb^(2+)adsorption efficiency of P-MOF-5@cellulose/PP could still be reached 70.84%.Compared to cellulose/PP,the tensile strength and breaking elongation rate of P-MOF-5@cellulose/PP were slightly decreased.