Modeling of Ce(IV) transport through a dispersion flat combined liquid membrane with carrier P507

doi:10.1007/s11783-013-0540-1

Front.Environ.Sci.Eng.

2014, Vol. 8

Issue (4) : 503-509 https://doi.org/10.1007/s11783-013-0540-1

RESEARCH ARTICLE

Modeling of Ce(IV) transport through a dispersion flat combined liquid membrane with carrier P507

Liang PEI^1,^2,^*(

),Liming WANG²,Zhanying MA²

1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographical Sciences and Natural Resource Research, Chinese Academy of Sciences, Beijing 100101, China
2. Faculty of Water Resources and Hydraulic Power, Xi’an University of Technology, Xi’an 710048, China

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Abstract

A mathematical model for the transport of Ce(IV) from hydrochloric acid solutions through dispersion flat combined liquid membrane (DFCLM) with contain 2-ethyl hexyl phosphonic acid-mono-2-ethyl hexyl ester (P507) as the carrier, dissolved in kerosene as the membrane solution have been studied. This process of facilitated transport, based on membrane technology, is a variation on the conventional technique of solvent extraction and may be described mathematically using Fick’s second law. The equations for transport velocity are derived considering the diffusion of P507 and its metallic complexes through the liquid membrane. In this work, the system is considered to be in a transient state, and chemical reaction between Ce(IV) and the carrier to take place only at the solvent–aqueous interfaces. Model concentration profiles are obtained for the Ce(IV), from which extraction velocities are predicted. The experimental and simulated Ce(IV) extractions showed similar tendencies for a high Ce(IV) concentration and acidity case.The model results indicate that high initial Ce(IV) concentrations and acidity both have detrimental effects on Ce(IV) extraction and stripping. The diffusion coefficient of Ce(IV) in the membrane and the thickness of diffusion layer between feed phase and membrane phase are obtained and the values are 6.31 × 10^-8 m²·s^-1 and 31.2 μm, respectively. The results are in good agreement with experimental results.

Keywords Dispersion flat combined liquid membrane (DFCLM) dispersion phase feed phase 2-ethyl hexyl phosphonic acid-mono-2-ethyl hexyl ester Ce (IV)

Corresponding Author(s): Liang PEI

Issue Date: 11 June 2014

Cite this article:

Liang PEI,Liming WANG,Zhanying MA. Modeling of Ce(IV) transport through a dispersion flat combined liquid membrane with carrier P507[J]. Front.Environ.Sci.Eng., 2014, 8(4): 503-509.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-013-0540-1
https://academic.hep.com.cn/fese/EN/Y2014/V8/I4/503

Fig.1 Experimental installation of DFCLM process.1,2-feed phase; 3,4-dispersion phase; 5- PVDF membrane; 6,7-pumps

Fig.2 Diagram of Ce(IV) transport through the dispersion combined liquid membrane. HR represents the carrier within the membrane, which in this case is P507. CeR₂(HR₂)₂ represents the organometallic compound, H⁺ is the hydrogen ion and Ce⁴⁺, the uncomplexed Ce(IV) ( A and B are the boundaries of the membrane phase )

Fig.3 Principle of DFCLM process

Fig.4 Effect of acidity in the feed phase on transport of Ce(IV) in the feed phase.The transport rate of Ce(IV) decreases when the acidity in the feed phase increased from 0.01 to 0.50 mol·L^-1, and a maximum transport rate observed at acidity of 0.1 mol·L^-1 is 93.1% during 75 min. Above the acidity of 0.1 mol·L^-1 in the feed phase, the transport rate of Ce(IV) decreases to 61.2%

Fig.5 Effect of initial concentrations of Ce(IV) on transport of Ce(IV). When the Ce(IV) concentration were 0.8 × 10^-4 mol·L^-1, 1.0 × 10^-4 mol·L^-1, 1.3 × 10^-4 mol·L^-1 and 2.0 × 10^-4 mol·L^-1, the transport rate was up to 97.2%, 93.5%, 86.1% and 70.9% in 75 min. The transport rate was up to 97.7% in 55 min, when initial concentration of Ce(IV) was adjusted to 0.3 × 10^-4 mol·L^-1, and after 55 min Ce(IV) was hardly determined

Fig.6 Comparison between experimental and model(II). the relationship between 1/P_C and [H⁺]³ are examined to be linear. The value of R² is 0.9601, which is in good agreement with the theory. The slope and intercept of the line are 2.03 × 10⁶ s·L⁴· (m·mol⁴)^-1 and 3.20 × 10⁴ s·m^-1

Fig.7 Comparison between experimental and model(I). Both experimental and those predicted by the model, are presented as a function of time for a acidity run

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