Open Chemical Physics Journal
Molecular Spectroscopic Study of Water Hyacinth Dry Matter
Medhat Ibrahim, Oliver Kühn and Traugott Scheytt
The potential use of water hyacinth dry matter for removing heavy
metals from wastewater is studied by combining various spectroscopic
techniques and quantum chemical ab initio calculations. The aquatic
plant water hyacinth was treated with 0.025, 0.050, 0.100, 0.200,
and 0.400 M acetic acid for different times up to 19.0 hours. The
plant was divided into root and shoot then dried and grinded into
pieces of 200 µm in diameter. FTIR measurements revealed that acetate
finds its way to the plant root and is then transported to the shoot.
Furthermore, it is shown that the treated and dried plant can be
used to mediate Cd from wastewater. FAAS results indicate that 55%
of Cd (in case of low concentration) and 80% of Cd (in case of higher
concentration) could be removed from wastewater within 2.0 hours.
The coordination of acetate to the plant was assumed to happen via
the cellulose of the plant where also the Cd uptake takes place.
This is confirmed by studying changes in the absorption of the C=O
stretching band of cellulose acetate subject to CdCl2 by FTIR and
by a cellulose monomer quantum chemical model.