Rate analysis of sorption of Ce^3＋,Sm^3＋,and Yb^3＋ions from aqueous solution using Dowex 50W-X8 as a sorbent in a continuous flow reactor  

作　　者：Esmail Monazam Ranjani Siriwardane Duane Miller Dustin Mclntyre 

机构地区：[1]REM Engineering Services,PLLC,3537 Collins Ferry Rd.,Morgantown,WV 26505,USA [2]National Energy Technology Laboratory,U.S.Department of Energy,3610 Collins Ferry Rd.,Morgantown,WV26507-0880,USA [3]AECOM,3610 Collins Ferry Rd.,E O.Box 880,Morgantown,WV 26507-0880,USA

出　　处：《Journal of Rare Earths》2018年第6期648-655,共8页稀土学报（英文版）

基　　金：supported by U.S.Department of Energy

摘　　要：Kinetic analysis of removal of three rare earth elements metals, Ce, Sm, and Ybions from aqueous solutions in a continuous flow fixed bed reactor using Dowex 50 W-X8 ion-exchange resin was conducted. The performance of the fixed bed sorption was evaluated using the concept of the sorption breakthrough process. Parameters characteristic of a fixed bed sorption such as breakthrough times,saturation times, critical reactor lengths, and lengths of mass transfer zone were inferred from the metal ion concentration breakthrough curves. The sorption capacity of Dowex 50 W-X8 ion-exchange resin for Ce3+, Sm3+, and Yb3+ are 191, 252, and 294 mg/g, respectively. The sorption kinetics were evaluated using a zero-order, first-order and second-order reaction models. The kinetics of the sorption process follows a zero-order model which has not been reported before. The rate constants of sorption using the zero-order kinetic model are obtained. Two different analysis were conducted to identify whether the diffusion is intraparticle or film diffusion. Both analysis confirms that the film diffusion is the controlling mechanism in reactor bed.Kinetic analysis of removal of three rare earth elements metals, Ce^(3+), Sm^(3+), and Yb^(3+) ions from aqueous solutions in a continuous flow fixed bed reactor using Dowex 50 W-X8 ion-exchange resin was conducted. The performance of the fixed bed sorption was evaluated using the concept of the sorption breakthrough process. Parameters characteristic of a fixed bed sorption such as breakthrough times,saturation times, critical reactor lengths, and lengths of mass transfer zone were inferred from the metal ion concentration breakthrough curves. The sorption capacity of Dowex 50 W-X8 ion-exchange resin for Ce3+, Sm3+, and Yb3+ are 191, 252, and 294 mg/g, respectively. The sorption kinetics were evaluated using a zero-order, first-order and second-order reaction models. The kinetics of the sorption process follows a zero-order model which has not been reported before. The rate constants of sorption using the zero-order kinetic model are obtained. Two different analysis were conducted to identify whether the diffusion is intraparticle or film diffusion. Both analysis confirms that the film diffusion is the controlling mechanism in reactor bed.

关 键 词：Rare earth metal ion removal Sorption of rare earths Dowex 50W-X8 for rare earth ion-exchange 

分 类 号：X703[环境科学与工程—环境工程]