微波辐射法制备N-亚水杨基壳聚糖Schiff碱及其吸附性能的研究

Preparation of N-Salicylidene Chitosan Schiff Base under Microwave Irradiation and Its Adsorption Capacity

应用微波辐射法制备了N-亚水杨基壳聚糖Sch iff碱,探讨了微波辐射的辐射功率、辐射时间对缩合度的影响,并用UV、FTIR、TG/DTA表征产物的结构;同时研究了N-亚水杨基壳聚糖Sch iff碱的吸附性能。研究结果表明,应用微波辐射加热手段,壳聚糖生成N-亚水杨基壳聚糖Sch iff碱的反应速度远远高于传统加热手段,为获得相同的缩合度(DC=88%),微波加热法只需360 W反应6 m in,而常规水浴加热法需在85℃反应6 h;与常规水浴加热法相比,微波辐射加热制得的N-亚水杨基壳聚糖Sch iff碱对金属离子的吸附容量要大一些,在25℃时,对Cu2+、Zn2+、Fe2+和N i2+的吸附容量分别达到90.5、78.5、10.2和26.3 mg/g。

N-salicylidenea chitosan schiff base was prepared by the method of microwave irradiation. The effects of reaction time and microwave output on the degree of condensation （DC） were studied. The product was characterized by UV, FTIR, TG/DTA, and its adsorption property was investigated. The result indicates that the rate of the formation reaction of N-salicylidene chitosan schiff base was greatly enhanced under microwave irradiation. The same degree of condensation（ DC = 88% ）was reached with 6 min of 360 W microwave irradiation vs 6 h at 85 ℃ by conventional heating technique. The N-salicylidenea chitosan schiff base prepared via microwave irradiation exhibited higher adsorption capacity for metal ions than that v/a conventional heating technique. At 25 ℃ , its adsorption capacity for Cu^2＋ , Zn^2＋ , Fe^2＋ , Ni^2＋ was 90. 5, 78.5, 10.2, 26.3 mg/g, respectively.