Transport of chromium(VI) through a supported liquid membrane containing a Tri-n-octylphosphine oxide

Ting Chia Huang, Chee Chang Huang, Dong Hwang Chen

研究成果: Article同行評審

21 引文 斯高帕斯(Scopus)

摘要

In this study the transport of chromium(VI) from aqueous solutions of pH 2-4 through a supported liquid membrane (SLM) with tri-n-octylphosphine oxide (TOPO) dissolved in kerosene as a mobile carrier was investigated. The transport flux of Cr(VI) increased with an increase in the concentrations of Cr(VI) in the feed phase and of TOPO in the membrane phase, but with a decrease in pH of the feed phase. Considering the equilibria of various Cr(VI) species in the aqueous phase and of the Cr(VI)-TOPO complexes formed in the membrane phase, a permeation model including the aqueous film diffusion of HCrO4- and Cr2O72- toward the membrane, the interfacial chemical reaction between them and TOPO, and the membrane diffusion of the Cr(VI)-TOPO complexes (H2CrO4·(TOPO) and H2Cr2O7·(TOPO)3) was proposed to describe the transport of Cr(VI) through the SLM. By best fitting the transport flux equations of Cr(VI) with the experimental data using the Rosenbrock method, the apparent mass-transfer coefficients of HCrO4- and Cr2O72- across the aqueous film, and those of H2CrO4·(TOPO) and H2Cr2O7·(TOPO)3 across the membrane phase, were obtained. This work helps to clarify the transport mechanism of Cr(VI) through an SLM.

原文English
頁(從 - 到)1919-1935
頁數17
期刊Separation Science and Technology
33
發行號13
DOIs
出版狀態Published - 1998 一月 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation

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