doi:

DOI: 10.3724/SP.J.1145.2013.01046

Chinese Journal of Appplied Environmental Biology (应用与环境生物学报) 2013/19:6 PP.1046-1052

Biosorption of Pb~(2+) by Dried Powder of Duckweed (Lemna aequinoctialis)


Abstract:
In order to develop efficient biosorbent material for Pb2+ removal from wastewater, this study explored the biosorption of duckweed(Lemna aequinoctialis) powder. Single-factor experiments were designed to investigate the dominant effect on Pb2+ removal. The experimental data were f itted with adsorption kinetics and isotherms to investigate the adsorption properties. The infrared spectroscopy was used to probe the surface characteristics of the sorbent. The results of single-factor experiments suggested that initial pH, grain size of sorbent and initial concentration of Pb2+ had significant effects on the removal effi ciency of Pb2+. The infrared spectroscopy analysis indicated that the —OH groups of carbohydrate compounds and the —NH2 groups of amide compounds may be the main groups involved in the adsorption of Pb2+ by the powder of L. aequinoctialis. This process followed the pseudo second-order kinetic with a correlation coeff icient(R2) of 0.999 95 and the k2 of 3.65 g min-1 mg-1. The experimental data were well f itted with Freundlich isotherm model and the maximum Pb2+ adsorption capacity was higher than 5 6.79 mg/g. This study suggested that the powder of L. aequinoctialis, as a new biosorbent material, has high Pb2+ adsorption rate and capacity under various conditions. Fig 5, Tab 2, Ref 31

Key words:duckweed,Lemna aequinoctialis,biosorbent,lead pollution,biosorption kinetics,infrared spectroscopy

ReleaseDate:2015-04-15 08:42:23



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