Abstract
Magnetic carbon nanotubes(CNTs) were fabricated by thermolysis method. The magnetic CNTs were further characterized by various techniques such as scanning electron microscope(SEM), X-ray diffraction(XRD) and Brunauer-Emmett-Teller surface measurement(BET). The characterization results demonstrated that the fabricated magnetic CNTs with high purity and uniform pore size distribution possessed an outside diameter of ca. 50 nm and a surface area of ca. 146.7 m2/g. The magnetic CNTs were subsequently used as adsorbent for sorption removal of pentachlorophenol in aqueous solution, exhibiting superior adsorption performance and easy recycling characteristic by an additional magnetic field. The experimental results indicated that the adsorption kinetic curve of the magnetic CNTs towards pentachlorophenol was accordance with Langergren kinetic adsorption model with an equilibrium adsorption capacity of 30.5 mg/g, and the sorption isotherm fitted very well Freundlich isotherm model. The reusing experiments revealed that after five adsorption and microwave regeneration cycle tests, the regeneration efficiency of the CNTs adsorbent was higher than 100%, moreover, the CNTs adsorbent still maintained well magnetic.
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