The Role of Cellulosic and Noncellulosic Functional Groups in the Biosorption of Lead Ions by Waste Flax Fibers

In this study, waste flax fibers with different levels of cellulosic and noncellulosic components were obtained by oxidative alkali treatments used to assess the influence fiber’s structural chemical properties on biosorption lead ions. Scanning electron microscopy was for characterization fibers’ surface morphology, while physicochemical determined streaming potential method, Fourier transform infrared spectroscopy. Alkaline treatment decreased, increased crystallinity index approximately 10%, due changes in content components. Adsorption ions studied detail, including kinetics, isotherms, thermodynamic parameters analysis. It shown that amount distribution oxygen-containing groups, originating from components, have highest adsorption capacity fibers, increasing Langmuir 12.76 mg g−1 untreated 21.9 79.9 alkali-treated oxidized respectively. Obtained negative values ∆GӨ (−4.874 −0.807 kJ mol−1) ∆HӨ (−42.81 −13.65 indicated onto is a spontaneous endothermic process, which occurs through electrostatic attraction ion-exchange. The results presented work demonstrate suitable composition may be as sustainable renewable low-cost biosorbents.