Abstract:Fenton was used to modify multiwalled carbon nanotubes (MWCNTs) which were prepared by catalytic splitting decomposition method. Modification effects on physicochemical properties of the MWCNTs as well as adsorption properties of methylene blue on them were studied. According to transmission electron microscopy (TEM) and BET surface area characterization, the obtained Fenton modified MWCNTs were clean and uniform in porosity. The outside diameter and surface area of the modified MWCNTs were 30 nm and 120 m2/g, respectively. Large amount of oxygenous functional groups was introduced onto the surface of MWCNTs by modification with Fenton whose isoelectric point was 1.8 measured by zeta potential. The adsorption kinetics curves of methylene blue on both Fenton modified or unmodified MWCNTs could be well correlated by Langergren kinetic adsorption model. According to which, their equilibrium adsorption capacity were 36.4mg/g and 24.5mg/g, respectively. Their adsorption isotherms for methylene blue could be well correlated by Freundlich model giving Freundlich constant (kF) 25.37 and 7.92 respectively. Improvement of both temperature and pH was helpful for methylene blue adsorption on Fenton modified MWCNTs.