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为了提高甘蔗渣的吸附量,通过均苯四甲酸二酐(PMDA)改性蔗渣纤维制备PMDA-SCB以提高其吸附回收稀土离子的能力。FTIR和SEM表征分析,蔗渣纤维表面接枝了大量的羧基基团,为吸附目标离子提供大量的活性位点。实验结果表明:pH值对吸附剂吸附效果影响较大,最佳pH值为6。PMDA-SCB对La~(3+),Gd~(3+),Y~(3+)的Langmuir等温吸附量分别为74.85,88.90和43.30 mg·g~(-1),是未改性蔗渣SCB的9.2,9.1和10倍。准二级动力学方程能更好地描述吸附方程,其R2大于0.999。PMDA-SCB经过4次吸附解析循环后,其吸附量降低率比较少,说明PMDA-SCB能有效去除并回收废液中的稀土离子。
In order to increase the amount of bagasse adsorbed, PMDA-SCB was prepared by modifying the bagasse fiber with pyromellitic dianhydride (PMDA) to enhance its ability to adsorb and recover rare earth ions. FTIR and SEM characterization analysis showed that a large amount of carboxyl groups were grafted onto the surface of bagasse fiber, providing a large number of active sites for the target ions to be adsorbed. The experimental results show that: the pH value of adsorbent adsorption effect, the best pH value of 6. The adsorption isotherms of Langmuir for La ~ (3 +), Gd ~ (3 +) and Y ~ (3+) were 74.85, 88.90 and 43.30 mg · g -1, respectively, 9.2, 9.1 and 10 times SCB. Quasi-second order kinetic equation can better describe the adsorption equation, R2 greater than 0.999. PMDA-SCB adsorption adsorption after four cycles, the reduction rate of its adsorption is relatively small, indicating PMDA-SCB can effectively remove and recover rare earth ions in the waste.