Design Of A Novel Cellulose-based Adsorbent For
Use In Heavy Metal Recovery From Aqueous
Waste Streams
Author(s)
D. W. O’Connell1, C. Birkinshaw & T. F. O’Dwyer
Abstract
Currently, significant metal-laden waste streams are produced from a number of
industries with obvious consequences for the environment. A variety of
techniques are being used to treat these wastewaters. One such technique is
adsorption and recent focus in this area has been around the preparation of
selective adsorbents based on naturally occurring support materials. In our work,
a regenerated cellulose wood pulp was grafted with the vinyl monomer glycidyl
methacrylate (GMA) and was further functionalised with imidazole to produce a
novel adsorbent material, cellulose-g-GMA-imidazole. A series of adsorption
studies were carried out on the cellulose-g-GMA-imidazole to assess its capacity
in the separate removal of lead and nickel ions (Pb(II), Ni(II)) from aqueous
solution. Cellulose-g-GMA-imidazole sorbent showed an uptake of
approximately 72 mg g-1 of Pb(II) and 45 mg g-1 of Ni(II) from aqueous solution.
The adsorption process in both cases followed the Langmuir model of adsorption
and Pb(II) uptake occurred within 30 minutes while Ni(II) uptake was
considerably slower at 400 minutes for maximum uptake. In both cases pseudo
second order kinetics best describes the overall process for each metal uptake.
The cellulose-g-GMA-imidazole material shows significant promise as a sorbent
for the removal of both Ni(II) and Pb(II) and other heavy metal ions from
aqueous and waste streams.
Keywords: aqueous waste streams, heavy metals, cellulose, adsorption.
Keywords
aqueous waste streams, heavy metals, cellulose, adsorption.
Related Book
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