Characterization and chromium biosorption potential of extruded polymeric substances from Synechococcus mundulus induced by acute dose of gamma irradiation
2019
Hussein, Mervat H. | Hamouda, Ragaa A. | Elhadary, Abdel Monsef A. | Abuelmagd, Muhammad A. | Ali, Shafaqat | Rizwan, Muhammad
This study characterized the extruded polymeric substances (EPS) secreted from Synechococcus mundulus cultures under the effect of 2-KGy gamma irradiation dose. The EPS demonstrated seven monosaccharides, two uronic acids and several chemical functional groups: O–H, N–H, =C–H, C=C, C=O, COO–, O–SO₃, C–O–C and a newly formed peak at 1593 cm⁻¹ (secondary imide). The roughness of EPS was 96.71 nm and only 28.4% total loss in weight was observed at 800 °C with a high degree of crystallinity quantified as CIDSC (0.722) and CIXRD (0.718). Preliminary comparative analyses of EPS exhibited high protein content in the radiologically modified (R-EPS) than control (C-EPS). Modified EPS were characterized with a high biosorption efficiency, which could be attributed to its high content of uronic acids, protein and sulphates as well as various saccharide monomers. Data revealed that 0.0213 mg L⁻¹ h⁻¹ is the maximum biosorption rate (SBRₘₐₓ) of Cr(VI) for R-EPS, whereas 0.0204 mg L⁻¹ h⁻¹ SBRₘₐₓ for the C-EPS respectively.
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