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Citation: WANG Cheng, SHI Zheng-Hai, YAO Bing-Hua, WANG Li. Transport of Cobalt(Ⅱ) by Supported Liquid Membrane Using Bis(2-ethylhexyl)phosphinic Acid as a Mobile Carrier[J]. Chinese Journal of Applied Chemistry, ;2004, 21(11): 1127-1131. shu

Transport of Cobalt(Ⅱ) by Supported Liquid Membrane Using Bis(2-ethylhexyl)phosphinic Acid as a Mobile Carrier

1.
a Department of Applied Chemistry, Institute of Science, Xi'an University of Technology, Xi'an 710048;
2.
b Department of Environment and Chemical Engineering, Xi'an University of Engineering Science and Technology, Xi'an

Corresponding author: YAO Bing-Hua,
Received Date: 21 February 2004
Available Online: 8 June 2004
Fund Project: 陕西省自然科学基金(2000H15) (2000H15)陕西省教育厅科研专项基金(00JK208)资助项目 (00JK208)

The transport of cobalt(Ⅱ) from an aqueous 1.0 mol/L HAc-NaAc(pH=5.8~6.0) feed solution into a stripping solution 0.33 mol/L H₂SO₄ through a supported liquid membrane(SLM) consisting of bis(2-ethylhexyl) phosphinic acid(BEHPA) in CHCl₃ on the microporous polypropylene film were studied. The stoichiometry of the extracted species of cobalt(Ⅱ) by BEHPA were determined. The liquid-liquid extraction is carried out by the following equation:Co²⁺+6HR=CoR₂·4HR+2H⁺,K_ex=3.89×10^-8 where HR represents BEHPA. The effects of pH value in feed solution, concentration of BEHPA in the membrane, experimental temperature and initial concentration of Co(Ⅱ) in the feed on the transport rate of Co(Ⅱ) were investigated. The transport kinetic equation is derived in terms of the law of mass diffusion and the interface chemistry. The thickness of aqueous diffusion layer(δ_a) and diffusion coefficient(d₀) of Co(Ⅱ) through SLM were evaluated, by the linear slope method, to be 7.73×10^-6 m and 5.69×10^-10 m²/s, respectively.
- supported liquid membrane,
- liquid membrane separation,
- bis(ethylhexyl) phosphinic acid,
- cobalt(Ⅱ)
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