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Facilitated transport of Hg(II) through novel activated composite membranes |
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| Authors: | |
| Institution: | (1) Departamento de Materiales, Área de Ciencia de los Materiales, Universidad Autónoma Metropolitana-Azcapotzalco, Av. San Pablo 180, Col. Reynosa-Tamaulipas, C.P. 02200, México;(2) Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo, Km. 4.5, C.P. 42076 Pachuca, Hidalgo, México;(3) Departament de Química, Unitat Analítica, Centre GTS, Facultat de Ciències, Universitat Autònoma de Barcelona, Edifici Cn, 08193 Bellaterra, Barcelona, España;(4) Departamento de Química, Área de Química Analítica, Laboratorio R-105, Universidad Autónoma Metropolitana-Iztapalapa, San Rafael Atlixco 186, Col. Vicentina, C.P. 09340, AP 55-534, México D.F., México |
| Abstract: | The results presented in this work deal with the prime application of activated composite membranes (ACMs) for the transport of Hg(II) ions in a continuous extraction–re-extraction system using di-(2-ethylhexyl)dithiophosphoric acid (DTPA) as carrier. The effects of variables such as the pH, the nature of the acid and the concentration of the casting solutions on the transport of Hg(II) are also investigated. When the ACM was prepared with a 0.5 M DTPA solution and when the feed solution contained 2.5×10–4 M Hg(II) in 0.1 M HCl, the amount of mercury extracted was greater than 76%. The re-extracted mercury was subsequently recovered by means of a stripping phase comprising 0.3 M thiourea solution in 2 M H2SO4, yielding 54% of the initial amount of mercury after transport had taken place for 180 min. |
| Keywords: | Activated composite membrane (ACM) Mercury Transport DTPA |
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