Publication: Biosorption of cadmium and chromium in duckweed Wolffia globosa
2
Issued Date
2002-01-01
Resource Type
ISSN
15226514
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2-s2.0-0036412396
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Mahidol University
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SCOPUS
Bibliographic Citation
International Journal of Phytoremediation. Vol.4, No.2 (2002), 73-86
Suggested Citation
E. Suchart Upatham, Benjaporn Boonyapookana, Maleeya Kruatrachue, Prayad Pokethitiyook, Krisna Parkpoomkamol Biosorption of cadmium and chromium in duckweed Wolffia globosa. International Journal of Phytoremediation. Vol.4, No.2 (2002), 73-86. doi:10.1080/15226510208500074 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/20006
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Title
Biosorption of cadmium and chromium in duckweed Wolffia globosa
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Abstract
The biosorption of cadmium (Cd) and chromium (Cr) by using dried Wolffia globosa biomass were investigated using batch technique. The effects of concentration and pH solution on the adsorption isotherm were measured by determining the adsorption isotherm at initial metal concentrations from 10 to 400 mg/L and pH 4 to 7 for Cd, and pH 1.5 to 6 for Cr. The adsorption equilibria were found to follow Langmuir models. The maximum adsorption capacity (Xm) at pH 7 in W. globosa-Cd system was estimated to be 80.7 mg/g, while the maximum removal achieved at pH 4, pH 5, and pH 6 were 35.1, 48.8, and 65.4 mg/g, respectively. The Xmat pH 1.5 in W. globosa - Cr system was estimated to be 73.5 mg/g, while the maximum removal achieved at pH 3, pH 5, and pH 6 were 47.4, 33.1, and 12.9 mg/g, respectively. The effects of contact times on Cd and Cr sorption indicated that they were absorbed rapidly and more efficiently at lower concentrations.