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

Ting Chia Huang; Chee Chang Huang; Dong Hwang Chen

doi:10.1080/01496399808545037

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

Ting Chia Huang, Chee Chang Huang, Dong Hwang Chen

Department of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

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 Cr₂O₇^2- 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 Cr₂O₇^2- 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.

Original language	English
Pages (from-to)	1919-1935
Number of pages	17
Journal	Separation Science and Technology
Volume	33
Issue number	13
DOIs	https://doi.org/10.1080/01496399808545037
Publication status	Published - 1998 Jan 1

All Science Journal Classification (ASJC) codes

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

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10.1080/01496399808545037

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

abstract = "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.",

author = "Huang, {Ting Chia} and Huang, {Chee Chang} and Chen, {Dong Hwang}",

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N2 - 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.

AB - 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.

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

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