The silk sericin is the main residue in silk production and it is found to be a low cost and efficient biosorbent.In this study,sericin was characterized with various techniques including SEM(scanning electron microscope),XRD,N2 physisorption,FTIR(Fourier transformed infrared spectroscopy) and XPS(X-ray photoelectron spectroscopy).The nitrogen content of sericin was ca.8.5 mmol·g-1 according to elemental analysis.Dye adsorp-tion by sericin biosorbent was investigated with the acid yellow(AY),methylene blue(MB) and copper(II) phthalocyanine-3,4'4″4'″-tetrasulfonic acid(CuPc) dyes from water.Sericin displayed large capacity for AY and CuPc adsorption with adsorption capacities of respectively 3.1 and 0.35 mmol·g-1,but it did not adsorbed methylene blue dye.This selectivity is due to the basicity of amide groups in sericin biosorbents.
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