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用一步共缩聚法合成了以环氧聚合物为基质的苯并咪唑、吡啶单配基螯合树脂,用核磁共振碳谱13C NMR和红外光谱(IR)测定了单配基螯合树脂的结构,并研究了其配位机制.在pH 1.0~6.0的缓冲溶液中用原子吸收法测定该类螯合树脂对Cu2+,Ni2+,Zn2+,Cd2+和Co2+氯化物的配合容量,螯合树脂的配基含量达到2.47~3.10 mmol.g-1;氨甲基吡啶螯合树脂(MAMPE)在pH 5.0对Cu2+有很好的选择性,最高配合容量为1.67mmol.g-1,半程配合时间t1/2=7 min;苯并咪唑螯合树脂(AMBME)在pH 2.0介质中选择性配合Cd2+,配合容量为0.75 mmol.g-1,并具有反向pH依从特性.Cu2+树脂顺磁共振波谱(EPR)表征和配位场研究结果初步证明树脂表面配合物为四面体配位结构.
A one-step copolycondensation method was used to synthesize the benzimidazole and pyridine monoderim chelate resin based on epoxy polymer. The structure of monomeric ligand chelating resin was determined by 13 C NMR and IR spectra. , And its coordination mechanism was studied.The complexing capacity of Cu2 +, Ni2 +, Zn2 +, Cd2 + and Co2 + chlorides of this kind of chelating resin was measured by atomic absorption method in buffer solution of pH 1.0-6.0, the chelating resin ligand The content reached 2.47 ~ 3.10 mmol.g-1; aminomethylpyridine chelate resin (MAMPE) had a good selectivity to Cu2 + at pH 5.0, the highest compatibility capacity was 1.67mmol.g-1, 2 = 7 min; AMBME chelating resin (AMBME) was prepared by the complexation of Cd2 + with a loading capacity of 0.75 mmol · g-1 at pH 2.0 and a reversed-phase pH- ) Characterization and coordination field studies initially proved that the resin surface complexes are tetrahedral coordination structure.