引用本文:
陈培根, 吴之传, 汪学骞, 陶庭先, 张宇东, 王二兰, 辛后群. 聚乙烯醇纤维-Fe(Ⅲ)配位反应动力学[J]. 应用化学,
2007, 24(3): 314-317.
Citation: CHEN Pei-Gen, WU Zhi-Chuan, WANG Xue-Qian, TAO Ting-Xian, ZHANG Yu-Dong, WANG Er-Lan, XIN Hou-Qun. Coordinate Reaction Kinetics of Polyvinyl Alcohol Fiber-Fe(Ⅲ)[J]. Chinese Journal of Applied Chemistry, 2007, 24(3): 314-317.
Citation: CHEN Pei-Gen, WU Zhi-Chuan, WANG Xue-Qian, TAO Ting-Xian, ZHANG Yu-Dong, WANG Er-Lan, XIN Hou-Qun. Coordinate Reaction Kinetics of Polyvinyl Alcohol Fiber-Fe(Ⅲ)[J]. Chinese Journal of Applied Chemistry, 2007, 24(3): 314-317.
聚乙烯醇纤维-Fe(Ⅲ)配位反应动力学
摘要:
以聚乙烯醇纤维(PVA)为配体原料,与FeCl3在溶液中进行反应,制备了PVA-Fe(Ⅲ)配合物,研究了PVA与溶液中Fe(Ⅲ)配位反应的动力学行为,为纤维与金属离子配位反应建立了动力学规律。结果表明,该反应最佳条件为反应温度60℃,反应时间2h,Fe(Ⅲ)初始浓度c=0.08mol/L,体系pH=2.0。PVA与Fe(Ⅲ)结合表现出单分子层吸附的特征,属化学结合;PVA配合Fe(Ⅲ)的量与溶液中Fe(Ⅲ)浓度之间符合Langmuir方程,饱和配合量为171.8mg/g干纤维。由反应时间与溶液剩余浓度的关系,用初始浓度法求出该反应为一级反应;在不同温度下,以聚乙烯醇纤维与初始浓度为0.08029mol/L的Fe(Ⅲ)溶液进行反应,测定了各温度下的反应速率常数,由速率常数与温度的关系,根据Arrhenius方程,得出该反应的活化能Ea为144.98kJ/mol,速率常数为lgk=-Ea/2.303RT+20.48。
English
Coordinate Reaction Kinetics of Polyvinyl Alcohol Fiber-Fe(Ⅲ)
Abstract:
By the reaction of FeCl3 with polyvinyl alcohol fiber, the complex of PVA-Fe(Ⅲ) was synthesized. The reaction kinetics was studied, and the reaction kinetics law of PVA fiber to metal ion was established. The results show that the optimum conditions of the reaction was c(Fe(Ⅲ))=0.08 mol/L, t=60℃, time=2 h and pH=2.0. It was found that the OH oxygen in PVA bonded to Fe(Ⅲ) ion and the coordinate data of PVA fiber to Fe(Ⅲ) could be well interpreted by the Langmuir isothermal adsorption model. The saturated coordinate capacity of PVA to Fe(Ⅲ) was 171.8 mg/g(dry fiber). The results show that the reaction is consistent with the first-order kinetic model. The reaction rate constant was measured by the reaction of polyvinyl alcohol fiber with FeCl3(initial concentration 0.08 mol/L) at different temperatures and its activation energy was 144.98 kJ/mol. The reaction rate constant can be expressed as lg k=-Ea/2.303RT+20.48.
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Key words:
- polyvinyl alcohol fiber
- / Fe(Ⅲ)
- / reaction kinetics
- / activation energy
- / reaction rate constant
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