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Volume 2
Journal of Environmental Research
Page 92
JOINT EVENT
July 26-27, 2018 Rome, Italy
&
6
th
Edition of International Conference on
Water Pollution & Sewage Management
4
th
International Conference on
Pollution Control & Sustainable Environment
Novel chitosan derivatives for recovery of platinum and palladium from aqueous acidic solutions
Tsegaye Girma Asere, Stein Mincke, Ivar Verheye, Kim Verbeken, Christian V Stevens
and
Gijs Du Laing
Ghent University, Belgium
P
latinum (Pt) and palladium (Pd) possess favorable physical and chemical properties for wide applications in many fields
such as catalysts in industries, jewellery, fuel cells, and electronics. The market demand of Pt and Pd is increasing because
of the natural reserves of these metals are limited and located in few regions of the world. Therefore, there is a great concern
in recovery of Pt and Pd from secondary sources for sustainable use of these metals. Chitosan is a naturally occurring polymer
which has been widely investigated by many researchers as a metal recovering agent. However, there are some limitations
in the use of chitosan as a metal recovering agent including low acid stability and poor mechanical properties. In order to
resolve these issues, three new chitosan derivatives were prepared in this work and employed for Pd (II) and Pt (IV) removal
from acidic solution. The prepared derivatives are 1, 10-phenanthroline-2, 9-dicarbaldehyde cross-linked chitosan (Ch-PDC),
[2, 2'-bipyridine]-5, 5'-dicarbaldehyde cross-linked chitosan (Ch-BPDC), and glutaraldehyde cross-linked chitosan followed
by grafting with 8-hydroxyquinoline-2-carbaldehyde (Ch-GA-HQC). The adsorption was very fast and reaches equilibrium
within 30 min. The adsorption better simulated by Langmuir isotherm compared to Freundlich isotherm. The maximum
adsorption capacity of Pd (II) was found to be 262, 155 and 340 mg Pd/g of Ch-PDC, Ch-BPDC, Ch-GA-HQC, respectively.
And, the maximum adsorption capacity of Pt (IV) was 114, 96 and 204 mg Pt/g of Ch-PDC, Ch-BPDC, Ch-GA-HQC,
respectively. Compared to other adsorbents in literature, the adsorption capacity of the synthesized chitosan derivatives was
relatively high. Therefore, these adsorbents are very promising for Pd (II) and Pt (IV) recovery from aqueous acidic solutions.
Finally, the relevance of these adsorbents for Pd (II) adsorption in industrial setting was tested using palladium containing
industrial wastewater.
tsegaye96@gmail.comJ Environ Res 2018, Volume: 2