Nickel Ion Extraction Using Liquid-Liquid Extraction And Supported Liquid Membrane
Loading...
Date
2016-09
Authors
Talebi, Amir
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Liquid-liquid extraction (LLE) and supported liquid membrane (SLM) can be considered as a suitable alternative for conventional heavy metals removal techniques. Both techniques have interesting advantages such as simultaneous extraction and stripping of heavy metals in a single unit, uphill transport, high selectivity, high recovery, and low energy consumption. This research aims to examine the efficiency of liquid-liquid extraction and supported liquid membrane technique on nickel ion removal. Three different organic phases, including palm oil-based, ionic carrier-based and petroleum-based organic phases were investigated to find out the optimum condition of various effective parameters on nickel ion extraction and stripping. Face centered composite design and response surface methodology were used for optimization and determination of the interactive and simultaneous impact of parameters affecting the nickel extraction. The results of LLE for optimum extraction and stripping processes were applied in nickel ion removal by SLM. The factors considered in the design were feed phase pH, carrier concentration, shaking time, stirring time, stripping agent concentration, stirring speed, inert salt concentration and phase modifier concentration. The liquid-liquid extraction results revealed that kerosene loaded with di-2-ethylhexylphosphoric acid of 0.156 M (as carrier) and sulphuric acid of 1.5 M for nickel ion extraction and stripping, respectively, resulted in 95.1% of nickel removal. In the case of using palm oil as diluent and di(2-ethylhexyl)phosphoric acid as carrier, 95.57% of nickel extraction could be obtained in the optimum condition of pH: 1.1 and D2EHPA: 200 mM; while optimum nickel extraction efficiency for ionic-based organic phase,
containing feed phase 73.45 mM of sodium diethyldithiocarbamate as carrier in octanol (diluent) at the feed phase pH: 3.89, with 94.93% of extraction efficiency. The results of optimum conditions for nickel removal using supported liquid membrane were feed phase pH 4.8, [D2EHPA]: 0.156 M, stirring time: 450 minutes and stripping phase agent of 1.5 M of H2SO4 which resulted in 95.38% of nickel removal. It could be concluded that the proposed SLM unit and optimum condition for nickel ion extraction and stripping can be considered as a suitable nickel ion extraction method.
Description
Keywords
The efficiency of liquid-liquid extraction and supported liquid membrane technique , on nickel ion removal.