Abstract
MnFe2O4-encapsulated in Scenedesmus obliquus composite is a new and promising magnetic biosorbent. It has the advantages of easy preparation, low cost, high surface area, eco-friendly biomaterial, easy separation from the treated water, and reusable. It was prepared by functionalizing the superparamagnetic MnFe2O4 by glycine to facilitate the intake of these magnetic particles into the algal cells during their growth. The structural characteristics of the prepared biosorbents were explored by X-ray diffraction, transmission electron microscopy, vibrating sample magnetometer, Fourier transform infrared spectroscopy, and surface analysis. Generally, the biosorbents showed strong abilities to adsorb methylene blue (MB) and crystal violet (CV) cationic dyes. The best magnetic biosorbent exhibited rapid adsorption of ∼83.0% and ∼92.5% for MB and CV, respectively, within 15 min at pH 11 and an adsorbent dose of 0.5 g/L. Redlich-Peterson isotherm best described the adsorption equilibrium data, and the kinetics study revealed that the sorption process is controlled by chemisorption besides the physisorption, and they are the rate-determining step for the whole adsorption process. For five successive runs, the best sample's usefulness was verified. Conclusively, the prepared magnetic biosorbents were demonstrated as good adsorbents for water contaminated by cationic dyes.
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