A core–shell amidoxime electrospun nanofiber affinity membrane for rapid recovery Au(Ⅲ) from water  

作　　者：Yang Chen Lanying Jiang 

机构地区：[1]School of Metallurgy and Environment,Central South University,Changsha 410083,China [2]National Engineering Research Center for Control&Treatment of Heavy Metal Pollution,Changsha 410083 China [3]Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety,Changsha 410000,China

出　　处：《Chinese Journal of Chemical Engineering》2022年第2期424-436,共13页中国化学工程学报（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities of Central South University(10400506021718);Hunan Provincial Science and Technology Project(2018TP1003).

摘　　要：An affinity membrane was prepared by coaxial electrospinning and amidoxime(AONFA),and it was applied to selectively recovery Au(Ⅲ)from an aqueous solution.The static adsorption results showed that,when p H at 5,the maximum adsorption capacity of AONFA membrane for Au(Ⅲ)was 509.3 mg·g^(-1).AONFA membrane exhibit much higher affinity and selectivity towards Au(Ⅲ)than other metal cations.The membrane could be regenerated effectively by mixture solution of thiourea and HCl,and the desorption ratio reached almost 100%after 4 hours desorption.The dead-end filtration results showed that,the membrane utilization efficiency and adsorption capacity can be improved by increasing the flow rate,while increasing the concentration shorted the breakthrough process and had little impact to adsorption capacity.We can flexibly adjust the flow rate and concentration according to the situation to obtain the maximum utilization efficiency of the membrane in filtration process.The dynamic adsorption capacity is higher than the static adsorption capacity.The adsorption mechanism for Au(Ⅲ)is electrostatic adsorption and reduction.Thus,AONFA membrane filtration was demonstrated to be a promising method for continuous recover Au(Ⅲ)from wastewater.

关 键 词：Coaxial electrospinning AMIDOXIME Affinity membrane Gold recovery 

分 类 号：TQ424[化学工程] X703[环境科学与工程—环境工程] TQ131.23