Comparative study of chitosan and silk fibroin staple microfibers on removal of chromium (VI): Fabrication, kinetics and thermodynamic studies

• Published in: Carbohydrate polymers Vol. 234; p. 115861
• Main Authors: Abdel-Mohsen, A.M., Jancar, J., Kalina, L., Hassan, Asaad F.
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 15.04.2020
• Subjects: Adsorption; Chitosan; Chromium (VI); Short-staple fibers; Silk fibroin; Thermodynamic studies; Thermodynamic studies; Silk fibroin; Chitosan; Chromium (VI); Adsorption; Short-staple fibers
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2020.115861

•Short-staple microfibers (SSM) from different sources were fabricated via a wet rotate-spinning technique.•SSMs were employed for removal Cr(IV) from aqueous solution for the first time.•Effects of pH value, fiber dose on the adsorption efficiency of Cr(VI) were investigated.•Physical, chemical, kinetics and thermodynamic properties were studied and evaluated. Short staple microfibers (SSM) based on chitosan (CS) or silk fibroin (SF) were fabricated via the wet-rotate-spinning technique and employed to adsorb hexavalent chromium from aqueous solution. Adsorption efficiencies, physicochemical and morphological properties of CS and SF-SSM were systematically investigated and evaluated before and after adsorption of Cr(VI) using different techniques like ATR-FTIR, TGA, XRD, XPS, and SEM. CS and SF-SSM showed removal efficiency (>90 %) toward Cr(VI) ions. Pseudo-second order kinetic and Langmuir isotherm models could describe the Cr(VI) ions uptake process. Considering the inexpensive, sustainability and higher adsorption capacity of CS and SF-SSM hold great promising applications as natural adsorbent materials for removing different hazardous metals from aqueous medium.