聚丙烯偕胺肟改性羊毛对氟离子的吸附及机理  

Adsorption of Fluorinion on Polyacrylamidoxime Decorated Wool and the Mechanism

作　　者：曹春[1,2] 康宏亮[1] 李萍萍[1,2] 张超[1,2] 李伟伟[1,2] 黄勇[1,3] 刘瑞刚[1] 

机构地区：[1]高分子物理与化学国家重点实验室,北京分子科学国家实验室,中国科学院化学研究所,北京100190 [2]中国科学院大学,北京100049 [3]工程塑料国家工程研究中心,中国科学院理化技术研究所,北京100190

出　　处：《高分子学报》2016年第4期486-493,共8页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号21174150)资助项目

摘　　要：针对去除水体中的阴离子污染物F-离子,制备了Fe^(3+)负载的改性羊毛吸附材料(Fe^(3+)/W-g-PAO).具体步骤是首先利用传统的丙烯腈自由基聚合以及羊毛上的巯基作为链转移剂制备聚丙烯腈接枝改性的羊毛材料,进而将腈基转化为偕胺肟基团,最后利用偕胺肟基团优异的配位作用,成功负载Fe^(3+).Fe^(3+)/W-gPAO可以高效快速吸附F-,其吸附过程符合准二级动力学模型和Langmuir热力学模型.通过这种吸附方式,其对F-的饱和吸附量为14.26 mg/g.若将水溶液中的F-与Fe^(3+)先形成稳定的配位化合物,再利用改性羊毛(W-g-PAO)作为吸附剂,可以大幅度的提高其对F-的吸附量,理论值最大可达49.2 mg/g.由于W-g-PAO可以将负载在其上的Fe^(3+)还原成Fe^(2+),因此前者吸附方式的吸附量会减少.通过对其吸附机理的研究表明,F-在Fe^(3+)/W-g-PAO负载时,会形成Fe(III)[F^-]_3[—NH_2]_3的配位结构.所合成W-g-PAO材料具有价格低廉、可循环再生使用、对F-优异的吸附性能等优点.A novel Fe3＋ loaded polyacrylamidoxime modified waste wool adsorbent （Fe3＋/W-g-PAO） was prepared to eliminate fluorinion （F-） in aqueous solutions. To be specific, polyacrylonitrile （PAN） was first grafted onto the waste wool by traditional free radical polymerization,in which thiol groups on waste wool were act as active sites for chain transfer. Subsequently, cyano-groups were converted to amidoxime groups. The prepared adsorbent （W-g-PAO） could successfully load Fe3＋ , due to the outstanding coordination ability of amidoxime groups with Fe3＋. Fe3＋/W-g-PAO possessed excellent adsorption capacity for F-, and the adsorption process was rapid and efficient. The adsorption process of F- on Fe3 ＋/W-g-PAO could be fitted well by the quasi-two dynamics model and Langmuir model. However, by this adsorption style, the adsorption capacity of F- on W-g-PAO was only 14.26 mg/g. If the formation of coordination compounds of Fe3 ＋ and F- was first prepared,the adsorption capacity of F- on W-g-PAO could be improved significantly to 49.2 mg/g. That＇ s because Fe3＋ could be reduced into Fe2＋ during the loading process of Fe3 ＋ . The results indicated that the structure of Fe （III） [ F- ]3 [-NH2 ]3 was formed when F- was adsorbed on Fe3＋/W-g-PAO. In conclusion,the material prepared in this work, W-g-PAO, has the advantages of low-cost, recyclable and excellent adsorption capacity,which can be used as a promising material for the application in the treatment of waste water containing fluoride ions.

关 键 词：聚丙烯偕胺肟 水处理 负载Fe3+ 氟离子 吸附 

分 类 号：TQ424[化学工程]