Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 151, Issue -, Pages 1040-1048Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2019.10.145
Keywords
Hydroxyapatite; Adsorption; Methylene blue; Regeneration; Xanthan gumderivative
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In this work, hydroxyapatite modified by xanthan gum (XG) derivative material (XMH) was prepared and applied to remove methylene blue (MB) from water. The physicochemical properties of XMH were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-Ray spectroscopy and thermogravimetric analysis. Results showed the operating variables (pH, ionic strength and adsorbent dosage) were related to the MB removal efficiency. Adsorption kinetic and adsorption isotherm were well fitted by the pseudo-second-order model and the Langmuir isotherm model, respectively. It indicated that the adsorption process was a monolayer layer adsorption and chemisorption process. Besides, the result of infra-particle diffusion model demonstrated that the intra-particle diffusion was not the only rate determining step. The maximum adsorption capability on MB was 769 mg/g. Thermodynamic parameters (Delta G(0),Delta H-0, and Delta S-0) showed that the adsorption was a spontaneous and endothermic process. Adsorption mechanisms of MB on XMH might be governed by electrostatic attraction and hydrogen-bonding. Furthermore. XMH could be regenerated well and retained MB removal efficiency of 81% after five cycles of adsorption and desorption. Therefore. XMH is a promising adsorbent for the efficient removal of MB from aqueous solution due to its low cost, good thermal stability and excellent adsorption performance. (C) 2019 Elsevier B.V. All rights reserved.
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