Issue 24, 2016

Biosorption of cadmium by a lipid extraction residue of lipid-rich microalgae

Abstract

The present study investigates the performances and mechanisms of biosorption of cadmium (Cd) ions using a lipid extraction residue from three strains of lipid production microalgae. The adsorption performance was determined by batch biosorption experiments and kinetic modeling. The algae cell in the whole growth period and lipid extraction residue both exhibited desirable adsorption performance. The lipid extraction residue from the strain of Coelastrum sp. PTE-15 had the highest capacity of Cd sorption, which was 32.8 mg g−1. FTIR data suggested that the functional groups acting as binding sites on the microalgae surface which participate in biosorption were carboxylic, hydroxyl, and amino. The biosorption properties and maximum adsorption capacity of the lipid extraction residue from three microalgal strains were determined by equilibrium modeling. The adsorption process followed the Langmuir isotherm model with a high value of correlation coefficients (≥0.99) and biosorption capacity being estimated to be 36.1 mg g−1.

Graphical abstract: Biosorption of cadmium by a lipid extraction residue of lipid-rich microalgae

Supplementary files

Article information

Article type
Paper
Submitted
20 Dec 2015
Accepted
03 Feb 2016
First published
04 Feb 2016

RSC Adv., 2016,6, 20051-20057

Biosorption of cadmium by a lipid extraction residue of lipid-rich microalgae

H. Zheng, W. Guo, S. Li, Q. Wu, R. Yin, X. Feng, J. Du, N. Ren and J. Chang, RSC Adv., 2016, 6, 20051 DOI: 10.1039/C5RA27264E

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