4.7 Article

Optimizing decolorization of methyl blue solution by two magnetic hydroxyapatite nanorods

Journal

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.jtice.2016.05.019

Keywords

Magnetic nanorods; Methyl blue; Adsorption; Kinetic and isotherm models; Mechanism

Funding

  1. National Natural Science Funds of China [51402153]
  2. Fundamental Research Funds for the Central Universities [KJQN201553]

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In this study, the application of two magnetic hydroxyapatite nanorods Sr-5(PO4)(3)(OH)/Fe3O4 and Sr5Ba3x(PO4)(3)(OH)/Fe3O4, called SPF and SBPF for short, was investigated as effective adsorbents for removal of methyl blue (MB) from aqueous solution. Effects of three influence parameters (i.e., pH, temperature, and adsorbent dosage) were studied to optimize the adsorption processes. Kinetic data for both materials fitted well with pseudo-second-order kinetic model. The isotherm data agreed well with Langmuir model for SPF and Freundlich model for SBPF. The maximum adsorption capacity of SBPF nanorods (702 mg/g) is higher than that of SPF (531 mg/g), suggesting higher potential for MB removal. Thermodynamic studies indicated the adsorption process by these nanorods was spontaneous and exothermic. Moreover, these magnetic adsorbents can be easily recovered, and the capacity was maintained over 86% of the initial capacity after being used for five cycles. Mechanistic studies indicate that there are hydrogen bonding for MB-adsorbed SPF; whereas both hydrogen bonding and ionic interaction for MB-adsorbed SBPF. Interestingly, these magnetic nanorods show not only high adsorption capacity for MB but also facile regeneration from aqueous solution. (C) 2016 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

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