REMOVAL OF URANIUM (VI) FROM AQUEOUS SOLUTION USING MODIFIED MULTIWALLED CARBON NANOTUBES: KINETIC, ISOTHERM AND THERMODYNAMIC STUDYMOHAMMAD REZA REZAEI KAHKHA AND MASSOUD KAYKHAIIAbstract In this study, feasibility of modified multi walled carbon nanotubes for removal of trace amounts of Uranium is studied. Multiwalled carbon nanotubes were oxidized with HNO3 and then modified with loading 1-(2-pyridylazo)-2-naphtol. The effects of various parameters like pH, contact time, and other factors influenced on removal efficiency of uranium on adsorbent have been studied. Results showed that the method is simple, fast and environmental friendly and it is unaffected by the other ions present in the natural waters. Equilibrium isotherm studies were used to evaluate the maximum sorption capacity of MMWCNTs. Results showed this to be around 118 mg g-1. The Freundlich and Langmuir models have been applied and the data correlate well with Langmuir model and that the sorption is chemical in nature. Thermodynamic parameters showed the exothermic heat of adsorption and the feasibility of the process. This method could be applied for removal of uranium from water.
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