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pubmed-article:12775076pubmed:abstractTextThis study focuses on the electrolytic regeneration of spent chromium plating solutions. These solutions contain a significant amount of chromium and a lesser amount of other heavy metals, which makes them a significant environmental concern and an obvious target for recycling and reuse. The type of separator used is extremely critical to the performance of the process because they are the major resistance in the transport-related impurity (Cu(II), Ni(II), and Fe(III)) removals from contaminated chromic acid solutions. A Nafion 117 membrane and a ceramic diaphragm separator traditionally used in the industry were tested for comparison. It was found that the mobilities of Cu(II) and Ni(II) were similar and higher than that of Fe(III) using both separators. The mobility of each cation was smaller in the Nafion membrane than in the ceramic diaphragm. The measured conductivity of the ceramic diaphragm was slightly higher than that of Nafion membrane. However, the Nafion membrane was much thinner than the ceramic diaphragm resulting in the system using the Nafion membrane having higher impurity removal rates than the system using the ceramic diaphragm. The removal rates were approximately equal for Cu(II) and Ni(II) and lowest for Fe(III). Both current and initial concentration affected the removal rates of the impurities. Modeling results indicated that a system using a Nafion separator and a small catholyte/anolyte volume ratio was better than a system using a ceramic separator for removing impurities from concentrated plating solutions if the impurities transported into the catholyte are deposited or precipitated.lld:pubmed
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pubmed-article:12775076pubmed:authorpubmed-author:HolsenThomas...lld:pubmed
pubmed-article:12775076pubmed:authorpubmed-author:HuangKuo-LinK...lld:pubmed
pubmed-article:12775076pubmed:authorpubmed-author:ChouTse-Chuan...lld:pubmed
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pubmed-article:12775076pubmed:dateRevised2009-11-19lld:pubmed
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pubmed-article:12775076pubmed:articleTitleComparing Nafion and ceramic separators used in electrochemical purification of spent chromium plating solutions: cationic impurity removal and transport.lld:pubmed
pubmed-article:12775076pubmed:affiliationDepartment of Civil and Environmental Engineering, Clarkson University, Potsdam, New York 13699, USA.lld:pubmed
pubmed-article:12775076pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:12775076pubmed:publicationTypeComparative Studylld:pubmed
pubmed-article:12775076pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed