Abstract
The alginate-kelp biochar composite hydrogel bead (Alg-KBC) was successfully developed via physical crosslinking with Ca2+. The composite material was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), inductively coupled plasma optical emission spectrometry (ICP-OES), and elemental analyzer. The Alg-KBC showed high removal capacity for crystal violet (CV), from aqueous solution (33.8% more than that of the pristine alginate bead). The adsorption isotherm data were fitted to the nonlinear forms of the Langmuir, Freundlich, and Redlich-Peterson isotherm models. Also, the adsorption kinetics data were analyzed with the nonlinear forms of the pseudo-first-order, pseudo-second-order, and intra-particle diffusion models. Both chemisorption and physisorption with an indispensable role of external mass transfer and stagewise pore diffusion were essential in the adsorption process. Thus, by impregnating biochar powder in alginate, a bio-platform, a composite hydrogel bead which has higher affinity for cationic dye in aqueous medium and also eliminates the onerous task of separating biochar powder from the adsorbate solution, was obtained. Hence, the Alg-KBC can be considered for efficient dye removal in the wastewater treatment process.
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This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF – South Korea) funded by the Ministry of Education (Grant No. NRF-2016R1D1A1B03935962).
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Ohemeng-Boahen, G., Sewu, D.D. & Woo, S.H. Preparation and characterization of alginate-kelp biochar composite hydrogel bead for dye removal. Environ Sci Pollut Res 26, 33030–33042 (2019). https://doi.org/10.1007/s11356-019-06421-2
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DOI: https://doi.org/10.1007/s11356-019-06421-2