The Study Of Aniline Adsorption On Carbon Nanotubes

Carbon nanotubes ,as a typical representative of nanomaterial ,have drawnwidespread attention since their discovery because of their distinctive physical andchemical properties and promising application in many fields. Now carbon nanotubeshave been one of the hotspots in the nanomaterial field. This paper mainly includesthree parts as follows:Part one: Purification of carbon nanotubes and determination of their surfacecharacteristicsCarbon nanotubes ,which were produced by catalytic chemical-vapour deposition, were purified by heating or refluxing with nitric acid respectively. Their physicochemical properties were investigated by SEM, FT-IR and BET N2 adsorption. Part two: Aniline adsorption on carbon nanotubesThe adsorption volume and rate change a lot on different carbon nanotubes . As-grown carbon nanotubes reached adsorption equilibrium in the shortest time ,but carbon nanotubes B had the largest adsorption volume .The less the solubility is ,the larger the adsorption volume can be acquired. The adsorption capacity decreased with the increase of temperature. The adsorption capacity enhanced with KC1 concentration from 0.1 to 0.7M. Further increase in the salt concentration reduced the adsorption capacity. Carbon nanotubes can be regenerated after simple treatment. Part three: Thermodynamics, Kinetics and Mechanism of aniline adsorption on carbon nanotubesThe results show that the adsorption isotherm confirms to the Freundlich equation, and the adsorption is a spontaneous ,exothermal and decreasing entropy process. The adsorption obeys the first-order kinetic equation-Lagergren mode. The forces between aniline and as-grown carbon nanotubes ,carbon nanotubes A are mainly Van Der Waals force and hydrophobic interaction. Besides above forces ,there are hydrogen-bonding and acid-base interaction between aniline andcarbon nanotubes B.