Separation of chromium and nickel ions by supported liquid membranes using TOA as carrier

Year 2019, Volume: 7 Issue: 1, 1 - 6, 18.06.2019

Vuslat Sarıkaya Osman Tutkun Kurmancan Kaparova

Abstract

The extensive
use of chromium in leather tanning, metallurgy, electroplating and other
industries has resulted in the release of aqueous chromium to the subsurface at
numerous sites. Cr (VI) has received considerable attention owing to its
extensive industrial applications and has long been recognised as a toxic
substance due to its strong oxidising 
potential and the ease with which it can cross the biological membranes.
In recent years the application of various solvent extraction technologies to
the removal and concentration of chromium have been widely studied; chemical
precipitation, ion exchange, reverse osmosis, diffusion dialysis, adsorption,
liquid membrane technique are some of the alternatives that have been reported
in the literature. Recently  supported
liquid membrane (SLM) extraction is an alternative to conventional  solvent extraction  due  to
its advantages like high selectivity, operational simplicity, low solvent
inventory, low energy consumption, zero effluent  discharge 
and combination of  extraction and
stripping into one single unit. In this work 
the selective separation of chromium from acidic media, containing the
mixtures of chromium and nickel  by SLM
was investigated using TOA (tri-octylamine) as carrier. The liquid membrane was
consisted of  the desired  concentration of  an extractant (TOA), a modifier (TBP), and a
diluent (chloroform, kerosene, cyclohexane). The membrane support was
microporous hydrophobic  polypropylene
Celgard 2500.  Such parameters as, the solvent type, feed solution pH,
extractant (TOA) concentration, modifier (TBP) concentration and temperature
were experimentally studied and the optimum conditions were determined. The
permeation coefficients (P) and the initial fluxes of  chromium (J_o)  were 
calculated. Separation factors of 
chromium  over  nickel 
was calculated  from the
experimental measurements.

Keywords

Supported liquid membranes; chromium-nickel separation; tri-octylamine (TOA); TBP; solvent extraction

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