Development of an electrically switched ion exchange process for selective ion separations

被引：118

作者：

Rassat, SD ^{[1
]}

Sukamto, JH ^{[1
]}

Orth, RJ ^{[1
]}

Lilga, MA ^{[1
]}

Hallen, RT ^{[1
]}

机构：

[1] Pacific NW Lab, Richland, WA 99352 USA

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 1999年 / 15卷 / 03期

关键词：

alkali cations; electroactive materials; electrochemical separation; ion exchange; pulp process stream; radioactive wastes;

D O I：

10.1016/S1383-5866(98)00102-6

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The electrically switched ion exchange (ESIX) process, being developed at Pacific Northwest National Laboratory, provides an alternative separation method to selectively remove ions from process and waste streams. In the ESIX process, in which an electroactive ion exchange him is deposited onto a high surface area elecrotrode, uptake and elution are controlled directly by modulating the electrochemical potential of the film. This paper addresses engineering issues necessary to fully develop ESIX for specific industrial alkali cation separation challenges. The cycling and chemical stability and alkali cation selectivity of nickel hexacyanoferrate (NiHCF) electroactive films were investigated. The selectivity of NiHCF was determined using cyclic voltammetry and a quartz crystal microbalance to quantify ion uptake in the film. Separation factors indicated a high selectivity for cesium and a moderate selectivity for potassium in high sodium content solutions. A NiHCF film with improved redox cycling and chemical stability in a simulated pulp mill process stream, a targeted application for ESIX, was also prepared and tested. (C) 1999 Published by Elsevier Science B.V.

引用

页码：207 / 222

页数：16

共 35 条

[31] REACTION OF NICKEL ELECTRODE SURFACES WITH ANIONIC METAL CYANIDE COMPLEXES - FORMATION OF PRECIPITATED SURFACES [J].