4-氨基-1,2,4-三氮唑改性超高分子量聚乙烯纤维对Au(Ⅲ)的吸附机理  

Adsorption mechanism of Au(Ⅲ) on UHMWPE fibers modified by 4-amino-1, 2, 4-triazole

作　　者：梁育林 魏向军[1] 庞利娟[1] 曾建荣[1] 金婵[1] 李燕[1,2,3] LIANG Yulin;WEI Xiangjun;PANG Lijuan;ZENG Jianrong;JIN Chan;LI Yan(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;ShanghaiTech University,Shanghai 201210,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049 [3]上海科技大学,上海201210

出　　处：《辐射研究与辐射工艺学报》2020年第1期15-22,共8页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金(21677116、91543118、11775289、11275256)资助~~

摘　　要：利用预辐射接枝技术将4-氨基-1,2,4-三氮唑(ATZ)引入到超高分子量聚乙烯(UHMWPE)纤维上,制备成4-氨基-1,2,4-三氮唑改性超高分子量聚乙烯纤维(UHMWPE-g(-GMA-ATZ))。探讨溶液初始pH对UHMWPE-g(-GMA-ATZ)纤维吸附Au(III)的影响和ATZ改性UHMWPE纤维对Au(III)的吸附机理。研究表明,在Au(III)质量浓度为50 mg/L、吸附剂为2 g/L的条件下,当溶液pH=2.0时,Au(III)的吸附效率达到了98.7%;扫描电子显微镜(SEM)、X射线衍射(XRD)和X射线吸收近边结构(XANES)结果显示金元素主要以金单质颗粒存在于纤维上,傅里叶变换红外光谱(FTIR)分析发现吸附Au(III)后亚氨基团(−NH−)消失,羧基产生。综合得到UHMWPE-g(-GMA-ATZ)纤维对Au(III)的吸附机理是基于Au(III)与纤维上的−NH−发生氧化还原反应,并伴随着羧基的生成,同时Au(III)被还原为Au(0)。该功能纤维开辟出一种简单高效的从废水中回收贵金属元素的有效途径。4-Amino-1,2,4-triazole(ATZ)was introduced into ultra-high molecular weight polyethylene(UHMWPE)fibers by pre-radiation grafting to prepare UHMWPE-g-(GMA-ATZ)fibers.The effect of the initial pH Au(III)adsorption by UHMWPE-g-(GMA-ATZ)fibers and the adsorption mechanism of Au(III)on the functional fiber were investigated.The adsorption efficiency of Au(III)reached 98.7%when the solution pH was 2,Au(III)concentration was 50 mg/L,and adsorbent concentration was 2 g/L.Scanning electron microscopy,X-ray diffraction and X-ray absorption near-edge structure showed that Au mainly existed on the fiber as metallic Au particles.Fourier transform infrared spectroscopy revealed that the imino groups(−NH−)disappeared after Au(III)adsorption,generating carboxyl groups.The adsorption mechanism of Au(III)on the UHMWPE-g-(GMA-ATZ)fiber is based on the redox reaction between Au(III)and−NH−on the fiber,accompanied by the formation of carboxyl group and the reduction of Au(III)to zero valence Au.This functional fiber can be used to facilitate a simple and efficient method for precious metal recovery from wastewater.

关 键 词：4-氨基-1 2 4-三氮唑 超高分子量聚乙烯纤维 AU(III) 吸附机理 

分 类 号：TL13[核科学技术—核能科学]