以水稻秸秆纤维素为原料,甲基丙烯酸缩水甘油酯(GMA)为单体,过氧化苯甲酰为引发剂,通过水溶液聚合法制备秸秆纤维素接枝GMA共聚物(Cell-PGMA),并用聚乙烯亚胺(PEI)进行改性,得到产物Cell-PGMA-PEI,采用红外光谱(FT-IR)对其进行结构表征。在静态条件下,考察初始浓度、吸附时间和pH等因素对Cell-PGMA-PEI吸附Cr3+、Zn2+的影响。Cell-PGMA-PEI对Cr3+的吸附符合Langmuir方程,Freundlich方程能够更好地拟合其对Zn2+的吸附过程,对两者的吸附动力学均符合伪二阶动力学模型。
Using cellulose of rice straw as raw material,glycidyl methacrylate as monomer,benzoyl peroxide as initiator,copolymer of straw cellulose grafted GMA was prepared by aqueous solution polymerization,and modified by polyethyleneimine(PEI).Cell-PGMA-PEI was obtained,and its structure was characterized by FT-IR.Under static condition,the effects of initial concentration,adsorption time and pH on the adsorption of Cr3+ and Zn2+ by Cell-PGMA-PEI were studied.The adsorption of Cr3+ by Cell-PGMA-PEI accorded with Langmuir equation,Freundlich equation can better fit the adsorption process of Zn2+,and the adsorption kinetics of both accorded with pseudo second-order kinetics model.
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