Removal Of Mercury(II) From Wastewater
Using Poly(vinyl Pyrrolidinone)
Author(s)
A. Etorki & M. Walli
Abstract
In this study a water soluble polymer, poly(vinyl pyrrolidinone) (PVP), was used
for separation and preconcentration of Hg(II) prior to their analysis by
Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES).
Poly(vinyl pyrrolidinone) polymers containing a pendant lactam ring which is
part of a monomeric repeat unit structure can form complexes with target metal
ions via oxygen and nitrogen. The Hg(II) and polymer solution were mixed and
Hg(II)-bound polymer was precipitated upon addition of acetone. Adding
saturated KNO3 solution to the sample, by the salting out effect, causes the
precipitation to be completed faster with less amount of acetone. The precipitate
was separated from the solution and dissolved directly with ultra deionised
water. In this way, analyte elements were again transferred into the liquid phase
and analysed by ICP-AES. The effects of pH, amount of the polymer, molecular
weight of the polymer, Hg(II) ion concentration and centrifuging time on the
recovery of the target metal ion have been investigated. The equilibrium
experimental data were fitted to Langmuir and Freundlich isotherms models. The
maximum Hg(II) adsorption capacity from aqueous solutions obtained was 30.4
mg/g at pH of about pH 6.0. Adsorption of heavy metal ions from artificial waste
water was also studied. The adsorption capacities were 26.5 mg/g for Hg(II),
20.2 mg/g for Cd(II) and 15.3 mg/g for Pb(II) with recoveries greater than 97%
and relative standard deviations of lower than 3% n=5.
Keywords: mercury(II) removal, adsorption isotherm, mercury sorption,
poly(vinyl pyrrolidinone), Langmuir isotherm, Freundlich isotherm, wastewater.
Keywords
mercury(II) removal, adsorption isotherm, mercury sorption,
poly(vinyl pyrrolidinone), Langmuir isotherm, Freundlich isotherm, wastewater.
Related Book
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