期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 92, 期 10, 页码 2666-2674出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2011.06.004
关键词
Biosorption; Desorption; Heavy metals; Isotherms; Residual biomass
资金
- Spanish Ministry of Science and Technology
This work examines the sorption capacity of a natural biomass collected from an irrigation pond. The biomass mainly consisted of a mixture of chlorophyte algae with caducipholic plants. Biosorption experiments were performed in monometallic and bimetallic solutions containing different metals commonly found in industrial effluents (Cd, Cu and Pb). The biosorption process was slightly slower in the binary system comparing with monometallic system which was related to competition phenomena between metal cations in solution. The biosorbent behaviour was quantified by the sorption isotherms fitting the experimental data to mathematical models. In monometallic systems, the Langmuir model showed a better fit with the following sorption order: Cu similar to Pb > Cd; and biomass-metal affinity order: Pb > Cd similar to Cu. In bimetallic systems, the binary-type Langmuir model was used and the sorption order obtained was: Pb similar to Cu > Cd. In addition, the effectiveness of the biomass was investigated in several sorption-desorption cycles using HCl and NaHCO3. The recovery of metal was higher with HCl than with NaHCO3, though the sorption uptake of the biomass was sensitively affected by the former desorption agent in subsequent sorption cycles. (C) 2011 Elsevier Ltd. All rights reserved.
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