Sorption and transformation of arsenic by extracellular polymeric substances extracted from Synechocystis sp. PCC6803.

摘要: Abstract Cyanobacteria widely distribute in the aqueous ecosystem and produce abundant extracellular polymeric substances (EPS), yet little is known about how quantity composition of cyanobacterial EPS change upon As exposure, what are functions these complex biopolymers sorption transformation processes. Here we extracted from Synechocystis sp. PCC6803, characterized their properties, quantified components exposure to arsenite (As(III))/arsenate (As(V)) treatments, investigated binding speciation as affected by levels solution pH. The total sites, zeta potential reducing power were 17.47 mmol g−1, -19.72 mV 1.71. amounts increased 22–65.3% 13.8–39% when cells treated with 10–500 μM As(III) As(V) respectively. removal was influenced doses pH, 52.8% at pH 8.5 for 49.5% 4.5 300 mg L−1 EPS. In addition, transformed addition respectively accounted 4.9–20.3% 6.5–26.7% dissolved after added (100–300 mg L−1) solutions. Fourier transform infrared spectroscopy (FTIR) three-dimensional excitation-emission fluorescence spectra (3D-EEM) revealed that bound functional groups such C═O, ─NH, ─OH via surface complexation/hydrophobic interactions. Taken together, this study demonstrated capable bind could be potentially applied remove or detoxify