Surface modification of chitin using ultrasound-assisted and supercritical CO2 technologies for cobalt adsorption
作者： Guilherme L Dotto , Jeanine M Cunha , Camila O Calgaro , Eduardo H Tanabe , Daniel A Bertuol
DOI: 10.1016/J.JHAZMAT.2015.04.009
关键词:
摘要: Ultrasound-assisted (UA) and supercritical CO2 technologies (SCO2) were used to modify the chitin surface and, improve its adsorption characteristics regarding cobalt. Chitin, before after treatments, was characterized by N2 isotherms (BET), infrared spectroscopy (FT-IR), X-ray diffraction (XRD) scanning electron microscopy (SEM). Unmodified modified chitins as adsorbents remove cobalt from aqueous solutions. The study performed equilibrium kinetic curves. particle characteristics, such as, area, pore volume porosity improved UA SCO2 treatments. crystallinity index decreased also, intense modifications observed. Langmuir Freundlich models adequate represent equilibrium. maximum capacities 50.03, 83.94 63.08 mg g(-1) for unmodified chitin, chitin. curves well represented pseudo-second order model. are alternatives characteristics.
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