Kinetics of facilitated transport of Zn(II) from leach liquor of spent LTS catalyst across bulk liquid membrane
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ORIGINAL PAPER
Kinetics of facilitated transport of Zn(II) from leach liquor of spent LTS catalyst across bulk liquid membrane Sushmita Sharma1 · Narendra Nath Dutta2 Received: 24 October 2019 / Accepted: 5 June 2020 © Iranian Chemical Society 2020
Abstract A kinetic study on facilitated transport of Zn(II) from leach liquor of spent low-temperature shift catalyst (LTS) has been investigated. Primarily, the hydrometallurgical leaching of Zn and Cu from the spent LTS catalyst was performed. Moreover, the selective transport of Zn from leach liquor was facilitated by bis (2-ethylhexyl) phosphate (HDEHP) across bulk liquid membrane. The aqueous phase pH plays an important role in the selective transport of Zn from feed to stripping phase. It was observed that more than 90% of Zn was extracted at an aqueous phase pH of 3. The kinetics of the transport was analyzed using a kinetic law of two consecutive irreversible first-order reactions. Kinetic parameters such as k1, k2, Rm, tm, and flux values were evaluated by fitting the experimental data. The order of the flux for the transport of Zn(II) in three diluents was observed as dichloromethane > chloroform > carbon tetrachloride. Keywords Spent LTS catalyst · Zinc (II) · HDEHP · Bulk liquid membrane · Transport kinetics
Introduction Bearing in mind the growing demand for transition metals and the continuous depletion of their high-grade ores, the recovery of such valuable metals from secondary sources has become a topic of interest. Spent catalysts are considered as one of the imperative secondary sources for recovery of metal values. Not only due to ongoing environmental concern but also their economic point of view, it is extremely important to recover the valuable metals from spent catalysts. A variety of leaching methods such as hydrometallurgy, bioleaching, pyrometallurgy, and chelating technique have been reported which can be found elsewhere for the dissolution of metals [1–5]. The leach liquor/solution obtained from the leaching process contains a variety of metal ions. Several approaches such as reactive extraction, chemical precipitation, ion exchange, liquid membrane, etc. have been proposed for selective recovery of metal ions from aqueous solution [6–11]. Besides, some other kinds of extraction * Sushmita Sharma [email protected] 1
Department of Chemical Engineering, Jaypee University of Engineering and Technology, Guna, MP, India
Department of Molecular Biology and Biotechnology, Tezpur University, Tezpur, Assam 784028, India
2
methods of cations and anions such as ionic liquid–liquid extraction, cloud point extraction, dispersive liquid–liquid microextraction, and headspace sorptive solid-phase microextraction have been developed [12–14]. However, the liquid membrane technique has become the most promising technique by the fact that it can carry out the simultaneous extraction and stripping of metal in a single step. Among liquid membrane techniques, bulk liquid membrane (BLM) has been found as a good alternative offering certain disti
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