Journal of Radiation Research and Radiation Processing ›› 2020, Vol. 38 ›› Issue (1): 15-22.doi: 10.11889/j.1000-3436.2020.rrj.38.010203

• RADIATION CHEMISTRY • Previous Articles     Next Articles

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

LIANG Yulin1,2,3,WEI Xiangjun1(),PANG Lijuan1,ZENG Jianrong1,JIN Chan1(),LI Yan1,2,3   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. ShanghaiTech University, Shanghai 201210, China
  • Received:2019-09-27 Revised:2019-10-22 Accepted:2019-10-22 Online:2020-02-20 Published:2020-02-25
  • Contact: WEI Xiangjun,JIN Chan E-mail:weixiangjun@sinap.ac.cn;jinchan@sinap.ac.cn
  • About author:LIANG Yulin (male) was born in July 1992, and obtained his bachelor’s degree from University of South China in June 2015. Now he is a graduate student at Shanghai Institute of Applied Physics, Chinese Academy of Sciences, majoring in nuclear technology and applications.
  • Supported by:
    National Natural Science Foundation of China(21677116)

Abstract:

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.

Key words: 4-Amino-1, 2, 4-triazole, UHMWPE fiber, Au(III), Adsorption mechanism

CLC Number: 

  • TL13