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以苎麻纤维为基础,通过甲醛交联固化杨梅单宁制备吸附材料(RF-BT),进一步经Mannich反应改性,引入-NH2,制备改性苎麻纤维接枝杨梅单宁吸附材料(RF-BTM)。通过IR和SEM等方法表征了两种材料的结构,并研究了两种材料对Pr3+,Nd3+稀土离子的吸附性能。实验结果表明:反应温度为303 K,p H为5.5,Pr3+溶液初始浓度为1127.2 mg·L-1,Nd3+溶液初始浓度为1153.6 mg·L-1时,RF-BT的最大吸附量为:Pr3+420.3 mg·g-1,Nd3+432.8 mg·g-1;RF-BTM的最大吸附量为:Pr3+461.7 mg·g-1,Nd3+477.8 mg·g-1;表现出优良的吸附性能,其吸附热力学符合Freundlich方程,动力学可用拟二级速率方程描述。
On the basis of ramie fiber, the adsorptive material (RF-BT) was prepared by formaldehyde crosslinkage curing of bayberry tannin, further modified by Mannich reaction, -NH2 was introduced to prepare modified ramie fiber grafted bayberry tannin adsorbent (RF-BTM ). The structures of the two materials were characterized by IR and SEM, and the adsorption properties of the two materials on Pr3 +, Nd3 + rare earth ions were also studied. The experimental results show that the maximum adsorption capacity of RF-BT is 303 K, p H is 5.5, the initial concentration of Pr3 + is 1127.2 mg · L-1 and the initial concentration of Nd3 + is 1153.6 mg · L-1. Pr3 +420.3 mg · g-1, and Nd3 + 432.8 mg · g-1. The maximum adsorption capacity of RF-BTM was: Pr3 + 461.7 mg · g-1 and Nd3 + 477.8 mg · g-1; The adsorption thermodynamics accord with the Freundlich equation, and the kinetics can be described by the pseudo-second-order rate equation.