A highly efficient pathway to recover gold from acid aqueous solution by using an amidoxime-functionalized UHMWPE fiber  

作　　者：Yu-Lin Liang Chan Jin Jiang-Tao Hu Zhen Liu Yan Li Jian-Rong Zeng Guo-Zhong Wu Xiang-Jun Wei 

机构地区：[1]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China

出　　处：《Rare Metals》2019年第11期1105-1112,共8页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.21677116,91543118,11775289 and 11275256)

摘　　要：A new amidoxime-functionalized ultrahigh molecular weight polyethylene fibrous adsorbent(UHMWPEg-PAO) was used for the recovery of Au(III) from acid aqueous solution.The maximum experimental absorption capacity of UHMWPE-g-PAO fiber was found to be approximately 220.0 mg·g^-1.Au adsorption on UHMWPE-g-PAO was characterized by synchrotron radiation-based microcomputed tomography(SR-μ-CT),transmission electron microscopy(TEM),X-ray absorption near-edge structure spectroscopy(XANES) and synchrotron radiation-based Fourier transform infrared microspectroscopy(SR-FTIR).The SR-μ-CT and TEM results showed the distribution features of gold particles on the fiber.The mechanism of Au(III) recovery from aqueous solutions by UHMWPE-g-PAO was based on the adsorbed Au(III) ions,which were reduced to metallic zero-valent gold(Au(0)) by amino groups(-NH2) in the amidoxime(AO)groups during the adsorption process,as confirmed by highresolution TEM(HRTEM) and XANES analyses.X-ray diffraction(XRD) results indicated that the incineration ashes contained metallic zero-valent gold.In conclusion,this amidoxime-functionalized fibrous adsorbent is a promising material for recovering gold from aqueous solution.A new amidoxime-functionalized ultrahigh molecular weight polyethylene fibrous adsorbent（UHMWPEg-PAO） was used for the recovery of Au（III） from acid aqueous solution.The maximum experimental absorption capacity of UHMWPE-g-PAO fiber was found to be approximately 220.0 mg·g-1.Au adsorption on UHMWPE-g-PAO was characterized by synchrotron radiation-based microcomputed tomography（SR-μ-CT）,transmission electron microscopy（TEM）,X-ray absorption near-edge structure spectroscopy（XANES） and synchrotron radiation-based Fourier transform infrared microspectroscopy（SR-FTIR）.The SR-μ-CT and TEM results showed the distribution features of gold particles on the fiber.The mechanism of Au（III） recovery from aqueous solutions by UHMWPE-g-PAO was based on the adsorbed Au（III） ions,which were reduced to metallic zero-valent gold（Au（0）） by amino groups（-NH2） in the amidoxime（AO）groups during the adsorption process,as confirmed by highresolution TEM（HRTEM） and XANES analyses.X-ray diffraction（XRD） results indicated that the incineration ashes contained metallic zero-valent gold.In conclusion,this amidoxime-functionalized fibrous adsorbent is a promising material for recovering gold from aqueous solution.

关 键 词：UHMWPE-g-PAO Adsorption mechanism GOLD Reduction 

分 类 号：O64[理学—物理化学]