Sorption of copper ions from aqueous solutions by Potamogeton luscens biomass
- Univ. Federal do Rio Grande do Sul, Porto Alegre (Brazil). Dept. de Engenharia de Minas
Sorption of copper ions from aqueous solutions by dried biomass of the aquatic plant Potamogeton luscens was studied at laboratory scale. The aquatic plant was collected in water resources in Brazil, washed, dried at 60 C and ground in a bladed mixer. Sorption experiments were conducted in agitated flasks and in a packed bed column. Maximum copper removal was obtained between pH 5.0 and 6.6 when copper was present in the ionic form Cu{sup 2+}. Sorption followed the Langmuir isotherm with saturation attained at 35 mg/g. Free energy of sorption was found to be of the order of {minus}25 kJ/mol. Sorption kinetics data were better described by a second order reaction and rate constants were calculated in 0.030 1/(min.mg) for {minus}4.0 mm particles and 0.081 1/(min.mg) for {minus}0.59 mm particles. Removal of metal ions in a packed bed column showed that Potamogeton luscens biomass can be used in several sorption/desorption cycles. After sorbent saturation, copper ions can be recovered from the loaded biomass by elution with H{sub 2}SO{sub 4} solution. Main mechanism responsible for heavy metal uptake was found to be ion exchange. Results are discussed in terms of the surface properties of the biomaterial, solution chemistry of copper ions and thermodynamics parameters.
- OSTI ID:
- 78155
- Report Number(s):
- CONF-950201-; ISBN 0-87339-279-5; TRN: IM9531%%206
- Resource Relation:
- Conference: Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Las Vegas, NV (United States), 12-16 Feb 1995; Other Information: PBD: 1995; Related Information: Is Part Of Separation processes: Heavy metals, ions and minerals; Misra, M. [ed.] [Univ. of Nevada, Reno, NV (United States)]; PB: 302 p.
- Country of Publication:
- United States
- Language:
- English
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