Abstract
Nitrogen and phosphorus compounds are very essentialelements for living organisms.However, when they aremore than needed, they can lead to eutrophication.The main purpose of this work is to kinetics study the possibilities for removal of ammonium ions from aqueous solutions by using multi-walled carbon nanotube (MWCNTs).The equilibrium time was found to be 35 min. Removal of ammonium ions was investigated using solutions with different concentrations in the range 100–140 mg/L. In this study adsorption of ammonium ions on multi-walled carbon nanotube surface has been investigated by UV-Vis spectrophotometer. The microstructure of carbon nanotubes were characterized using scanning electron microscopy (SEM).The kinetic rates were modeled by using the pseudo-first-order, pseudo-second-order, Intraparticle diffusion andElovich models. The pseudo-second-order model was found to explain the adsorption kinetics mosteffectively. It was also found that the pore diffusion played an important role in the adsorption. The results indicated a significant potential of the multi-walled carbon nanotube as an adsorbent for ammonium removal.
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