偕胺肟改性聚丙烯腈纤维与不同金属离子之间的配位反应性能  

Coordination Characteristics of the Amidoximed Polyacrylonitrile Fiber with Different Metal Ions

作　　者：董永春[1,2] 武金娜[1] 孙苏婷[1] 郑戌[1] 韩振邦[1] 刘春燕[1,2] 

机构地区：[1]天津工业大学纺织学院纺织化学与生态学研究中心,天津300160 [2]福州大学福建省光催化重点实验室-省部共建国家重点实验室培育基地,福建福州350002

出　　处：《四川大学学报（工程科学版）》2011年第1期173-178,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(20773093);教育部高等学校博士点专项基金资助项目(20070058005);天津市科技计划重点资助项目(09ZCKFSH02000)

摘　　要：为了更好地理解纤维材料与金属离子之间的反应,将偕胺肟改性聚丙烯腈纤维(AO-PAN)分别与5种金属离子Fe3+、Cu2+、Co2+、Ce3+和La3+进行配位反应并生成改性PAN纤维金属配合物,在考察了金属离子初始浓度和反应温度影响的基础上重点研究了不同金属离子的配位反应特性,并计算和比较了相关反应参数。结果表明,当AO-PAN与金属离子发生配位反应时,提高反应溶液中金属离子初始浓度和反应温度能够促进金属离子平衡配合量的增加。这个配位反应属于一级动力学反应,温度的升高能够导致其反应速率常数显著增大。在相同条件下5种金属离子的反应速率常数的排列顺序为Fe3+>Cu2+>Co2+>Ce3+>La3+,而其反应活化能则表现出相反变化趋势,这表明Fe3+离子的配位反应能力最高,而2种稀土金属离子的配位反应对温度的依赖性更强。热力学参数ΔH0>0、ΔS0>0、ΔG0<0,证实这个配位反应为自发进行的吸热反应。To obtain a better understanding of the reaction between fibrous materials and metal ions,the amidoximed polyacrylonitrile fiber（denoted as AO-PAN） was used to coordinate with five metal ions including Fe^3＋,Cu2＋,Co^2＋,Ce^3＋ and La^3＋,respectively,to produce the amidoximed PAN fiber-metal complexes.Coordinating characteristics of AO-PAN with metal ions were mainly studied and the effect of initial concentration of metal ions and temperature on coordinating capacities of AO-PAN to metal ions was also examined.The results indicated that when AO-PAN coordinating with metal ions,increasing the initial concentration of metal ions and higher temperature leads to an enhanced metal ion coordinating capacities.Moreover,reaction rate constants of five metal ions with AO-PAN increase with the elevation of temperature,and are ranked in the order of Fe^3＋ Cu^2＋ Co^2＋ Ce^3＋ La^3＋ at the same condition,but their activation energy shows a reverse trend.The thermodynamic characteristics of ΔH00,ΔS 00,ΔG00,which shows that the coordination of AO-PAN with metal ions is a spontaneous and endothermic process.

关 键 词：改性聚丙烯腈纤维 金属离子 配位反应 

分 类 号：TQ342.31[化学工程—化纤工业]