中文摘要：

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。

英文摘要：

The ramie fibers were used as raw materials to prepare adsorption material （RF-BT） by grafting bayberry tannin via formaldehyde cross-linking reaction. Another novel adsorption material （RF-BTM） was prepared based on the modification of RF-BT according to Mannich reaction, which induced amino group into the structure of RF- BT. The as-prepared two adsorption materials were characterized by IR and SEM, and their adsorption properties towards rare earth ions Pr^3＋ and Nd3＋ were investigated. The results indicated that the maximum adsorption capaci- ties of RF-BT to Pr^3＋ and Nd^3＋ were 420.3 and 432.8 mg·g-1 when temperature was 303 K, pH =5.5 and con- centration of Pr3＋ and Nd^3＋ were 1127.2 and 1153.6 mg·L-1, respectively. And under the same condition, the maximum adsorption capacities of RF-BTM to Pr^3＋ and Nd^3＋ were 461. 7 and 477.8 mg·g-1 which has exhibited superior properties. Furthermore, the adsorption kinetics towards to model the adsorption thermodynamics was corresponded with Freundlich equation and Pr^3＋ and Nd^3＋ could be fitted by pseudo-second-order rate equation dynamics