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La3+,Gd3+,Y3+的Langmuir等温吸附量分别为74.85,88.90和43.30 mg·g-,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.
Pyromellitic dianhydride (PMDA) modified sugar cane bagasse (SCB) was prepared to improve its adsorption capacity for rare earth ions.The adsorbent was characterized by FTIR and SEM.Due to the presence of a large number of carboxyl groups the bagasse provides PMDA-SCB a large number of active site for target ions adsorption.The results showed that pH had a great influence on adsorption capacity.Modified SCB had the maximum adsorption capacity at pH =6.Experimental results showed the adsorption capacities of PMDA-SCB for La3 +,Gd3 + and y3+ were 74.85,88.90 and 43.30 mg·g-1 respectively,which were 9.2,9.1 and 10 times as amount as the unmodified bagasse,according to Langmuir equation.Kinetic studies showed better correlation coefficients (R2 ＞ 0.999) for a pseudo-second-order kinetic model,confirming that the sorption rate was controlled by a chemisorption process.After 4 adsorption-desorption cycles,its adsorption capacity showed a slight decrease,implying that PMDA-SCB can be used as an effective adsorbent for the removal and recovery of La3+,Gd3+ and y3+ from aqueous solution.
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