Abstract
In this study, experiments were conducted to investigate the biosorption effect of the cyanobacteria Synechocystis sp. PCC 7806 on trivalent chromium (Cr (III)) and the fate of extracellular polymeric substances (EPS) during the biosorption process. Results indicated that Synechocystis sp. PCC 7806 could effectively adsorb Cr (III) but this adsorption capacity was inhibited by high amount Cr (III). The biosorption process decreased the growth rate of Synechocystis sp. PCC 7806. Furthermore, the characteristics of Synechocystis sp. PCC 7806 EPS were evaluated by parallel factor analysis (PARAFAC) combined with fluorescence excitation–emission matrices (EEMs). The results showed that there were four main components of EPS in Synechocystis sp. PCC 7806. It indicated that the fluorescent characterization of EPS was obvious affected by adsorption process of Cr (III). The tryptophan-like substances, amino acid substances and fulvic acids-like substances largely participated in the binding and biosorption of Cr (III).
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