Removal Of Copper, Nickel And Lead From
Wastewater Using A Modified Cellulose Material:
A Comparison
Author(s)
D. W. O'Connell, C. Birkinshaw & T. F. O’Dwyer
Abstract
Heavy metal waste streams from a variety of industrial sources pose a significant
environmental threat to receiving waters. Significant research work has focused
on the use of adsorbents and adsorption in the treatment and recovery of these
metals from waste streams. This paper focuses specifically on the design of a
novel adsorbent based on the naturally occurring material, cellulose and
application of this novel material to the removal of selected heavy metals from
waste streams. Cellulose material has limited heavy metal adsorbing capability.
To enhance its sorption capacity, a sorbent material was prepared by firstly
grafting glycidyl methacrylate monomer to cellulose. The grafted product was
then functionalised by the addition of imidazole. The novel material was then
assessed for its ability to adsorb the heavy metals Cu(II), Ni(II) and Pb(II).
Uptake levels on the cellulose-g-GMA-imidazole material were 68 mg g-1 Cu(II),
45 mg g-1 Ni(II), 71 mg g-1 Pb(II). These uptake levels compared favourably with
those achieved using other naturally occurring materials. The level of uptake of
each metal on the modified cellulose material was found, in all cases, to be
significantly influenced by aqueous pH. The optimum pH range in all cases
ranged from approximately pH 4 to pH 5.5. The speed of uptake of each metal
on the sorbent material ranged from approximately 40 minutes in the case of
Cu(II) and Pb(II) to almost 400 minutes for Ni(II) depending on initial metal
concentration in solution. The overall kinetics in each case is best described by
the pseudo-second order approach. Almost complete recovery of each metal
from the modified cellulose material was possible using a 0.1M acid solution;
however, re-use of the sorbent materials in further adsorption cycles yielded
variable outcomes.
Keywords: wastewater, heavy metals, adsorption, modified cellulose.
Keywords
wastewater, heavy metals, adsorption, modified cellulose.
Related Book
Other papers in this volume
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