Biosorption of Cu(II) ions from synthetic and actual wastewater using three algal species |
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Authors: | P C Siao G C Li H L Engle L V Ilao L C Trinidad |
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Institution: | 1.Department of Physical Sciences and Mathematics, CAS,UP Manila,Manila,Philippines;2.Institute of Chemistry,UP Diliman,Quezon City,Philippines;3.National Institute of Molecular Biology and Biotechnology (BIOTECH),UP Los Ba?os,Laguna,Philippines |
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Abstract: | The use of three freshwater microalgal cultures—Chlorella sorokiniana, Anabaena laxa, and Hapalosiphon welwitschii—for sorption of copper(II) from synthetic Cu(II) solutions and Marinduque, Philippines, wastewater was studied. The optimum
amount of biomass for the three species was 0.025 g dry weight. The optimum contact time for both C. sorokiniana and A. laxa was 1 h, whereas that of H. welwitschii was 30 min. All three species exhibited maximum Cu(II) sorption at pH 4.0–6.0. The Langmuir adsorption isotherm was the best
fit model for the three species. The three cultures were found to be effective biosorbents when used in synthetic wastewaters
of low concentration (10–30 ppm). Maximum Cu(II) reductions obtained were 88.2, 88.6, and 91.7% for the C. sorokiniana, A. laxa, and H. welwitschii cultures, respectively. C. sorokiniana, A. laxa, and H. welwitschii removed 5.70, 11.16, and 7.15% of Cu(II), respectively, when applied to wastewater taken from Consolidated Mines Inc. (CMI)
containing around 150 ppm Cu(II). C. sorokiniana and A. laxa, in combination, exhibited 14.05% Cu(II) removal from CMI wastewater. Desorption with 0.11 M HCl effected 73.20, 64.54, and
70.85% removal of Cu(II) from the surfaces of C. sorokiniana, A. laxa, and H. welwitschii, respectively. SEM-EDS spectra of the three species confirmed the presence of Cu(II) on their surfaces.
Presented at the 6th Meeting of the Asia Pacific Society of Applied Phycology, Manila, Philippines. |
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Keywords: | Anabaena laxa Chlorella sorokiniana Hapalosiphon welwitschii Biosorption Energy dispersive x-ray microanalysis Langmuir adsorption isotherm |
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