Chitosan-Starch Polymeric Blend Hydrogels as Scavengers of Antibiotics from Simulated Effluent: Sorbent Characterization and Sorption Kinetic Studies

A.U. Itodo, I.S. Eneji, T.T. Weor

Abstract


Crosslinked polymeric blends of chitosan (Chi) and starch (St) with glutaraldehyde (GLA) as the crosslinker was formulated for the sorptive removal of aqueous phase antibiotics; Tetracycline (TET) and Ciprofloxacin (CIP). Concentrations of Chi:St were varied from 1:5 to 5:1 with fixed glutaraldehyde concentration (2 %). The prepared sorbents were characterized using classical (swelling profile) and instrumental (Fourier Transform Infra-Red Spectroscopy (FTIR), Scanning Electron Microscope (SEM) and X-ray Diffraction (XRD)) techniques. The result indicates high swelling ratio for both H2O (distilled) and effluent (TET-CIP). FT-IR study shows crosslinked formation. The XRD of the Chitosan-Starch polymer blend showed a reduced crystalline domain and SEM images gave clear indication of potential sorption vacancies. Batch sorption experiments unveiled removal efficiency; RE (%) by the sorbents (CS15, CS24, CS33, CS42, and CS51) to range from 70 – 99.4 % at equilibrium time. Maximum antibiotics uptake was achieved with CS42 (93.1 – 99.4%) and sorption proceeds via chemisorption with intra-particle diffusion as one of the possible transport mechanism. Findings also revealed that derived sorbents prepared from Chitosan-Starch blend has the potential to be utilized for the treatment of effluent containing antibiotics. The substrates worked in synergy with comparable efficiencies to those of Commercial Activated Carbon. Keywords: Sorption, Tetracycline, Ciprofloxacin, Effluent, Diffusion, Characterization, Antibiotics

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Chemical Society of Nigeria