Oxidized multiwalled carbo n nanotubes as efficient adso rbent for ۲- (۴,۵-Diphenyl- ۱-H -Imidazol- ۲-yle)۴- N itrophen ol

In this work, an e fficient adsorption system for the removal of ۲- (۴,۵-Diphenyl- ۱-H-Imid azol-۲-yle)۴- Nitrophenol from an aqueous solution using ox idized multiwalled carbon nanot ubes(MWC NTs) has be en described. The influence of effective variable s suchas solution pH, c ontact time, initial ۲-(۴,۵-Diphenyl- ۱-H-Imida zol- ۲-yle)۴- Nitrophen ol concentration, amou nt of MWCNTs, and temperature on the adsorption efficiency in batch system was examined while ۲-(۴,۵-Diphenyl- ۱-H-Imidazol- ۲-yle )۴- Nitrophenol conten t was deter mined via U V-Vis spectrophotometer.Among different kinetic m odels (pseudo-first-order, pseud o-second-or der, intrapa rticle diffusion, and Elo vich model), experime ntal data of the removal process w ell fitted with the pseudo-second-order kinetic model with a high corre lation coefficient. Evaluating the fitness of ex perimental equilibrium data by va rious conv entional isotherm mod els including the Langm uir, Freundlich, and Tempkin mod els (based o n considering R۲ value as criterion) show the ap plicability of the Langmuir model for the interpretation of experim ental data w ith a maxim um adsorption capacity of ۶۰ mgg _۱ of adsorb ent. Therm odynamic p arameters (G ibb’s free e nergy, entro py and entha lpy) of adso rption show that the adsorp tion proces s has endothermic natur e.

کلیدواژه ها:

adsorption ، ۲-(۴ ، ۵-Diphenyl- ۱-H-Imidazol- ۲-yle)۴- Nitrophen ol ، multiw alled carbo n nanotubes ، adsorption isotherm ، thermodynamics and kinetics of adsorption.