Electro-deionization of Cr (VI)-Containing Solution. Part II: Chromium Transport through Inorganic Ion-Exchanger and Composite Ceramic Membrane
Makaleler > Tam Makale · 2008
Yazarlar: Yuliya S. DZYAZKO, Sergey L. VASILYUK, Ludmila M. ROZHDESTVENSKAYA, Vladimirn. BELYAKOV, Nikolayv. STEFANYAK, Nalan KABAY, MİTHAT YÜKSEL, Özgür ARAR, Uemran YUEKSEL
CHEMICAL ENGINEERING COMMUNICATIONS, SCI Expanded İndekslerine Giren Dergi, Uluslararası, 2008, cilt 196, ss 22-38
DOI: 10.1080/00986440802303715
Özet
Cr (VI) transport through a composite ceramic membrane containing an ion-exchange component, namely xerogel of hydrated zirconium dioxide, was investigated. The diffusion coefficient of Cr (VI) species through the membrane, which has been determined under open circuit conditions, is 1.80 x 10(-10) m(2) s(-1). The transport number of Cr (VI) species through the ceramic membrane was found to rise with increasing voltage and reached 0.17 under over-limiting current conditions. On the other hand, the transport of chromate ions through hydrogel of hydrated zirconium dioxide becomes more intensive with a decrease in potential drop through the system involving ion-exchanger bed and ceramic membrane due to decrease in the membrane resistance. The diffusion coefficient of Cr (VI) ions in hydrogel of the inorganic ion exchanger was estimated as 4.36 x 10(-12) m(2) s(-1). A possibility of Cr (VI) removal from a weakly acidic diluted solution using an electro-deionization method was shown: the degree of solution purification was found to reach 50%. The transport of species is realized through both the solution and the ion exchanger.