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Preparation of Magnetic Hydroxyapatite and Their Use as Recyclable Adsorbent for Phenol in Wastewater
Author(s) -
Wang Xianxiang
Publication year - 2011
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201000241
Subject(s) - adsorption , phenol , freundlich equation , fourier transform infrared spectroscopy , superparamagnetism , langmuir adsorption model , materials science , chemical engineering , thermogravimetric analysis , langmuir , calcination , nuclear chemistry , magnetic nanoparticles , sorbent , scanning electron microscope , specific surface area , chemistry , nanoparticle , magnetization , organic chemistry , composite material , magnetic field , nanotechnology , catalysis , physics , quantum mechanics , engineering
Magnetic hydroxyapatite (HAP), which combined superparamagnetic Fe 3 O 4 nanoparticles and HAP, composite materials were prepared by ultrasound method in this paper. It has also been found that these materials have the ability to adsorb phenol in wastewater. The magnetic materials were investigated by scanning electron microscope, X‐ray diffraction (XRD), Fourier transform infrared spectroscopy, thermal gravimetric analysis, vibrating sample magnetometer, and N 2 adsorption in order to elucidate the morphology, structure, and other properties. When the prepared magnetic materials were calcined at 200°C, the prepared Fe 3 O 4 was oxidized to Fe 2 O 3 , possessing loose‐shaped holes with a high specific area of 325.2 m 2 /g, a magnetization intensity of 12.5 emu/g, and the N 2 adsorption isotherm belongs to porous adsorption type I. Moreover, the magnetic HAP can adsorb 90% phenol in wastewater. This means that it is an excellent recyclable phenol sorbent for sewage treatment. Experiments confirmed that the Freundlich adsorption isotherms model applies to lower phenol concentrations (0–50 mg/L), while for high phenol concentrations (50–500 mg/L) the Langmuir adsorption isotherms model fits. The magnetic sorbents have the capacity to regenerate after reaching adsorption saturation using ethanol as eluant and external magnetic field as separation unit. The efficiency of adsorption was reduced only by 10% over a six time use period.