TITLE:
Surface Modification of Commercial Activated Carbon (CAG) for the Adsorption of Benzene and Toluene
AUTHORS:
Anna Sylmara da Costa Lopes, Samira Maria Leão de Carvalho, Davi do Socorro Barros Brasil, Rosivaldo de Alcântara Mendes, Marcelo Oliveira Lima
KEYWORDS:
Adsorption, Activated Carbon, Surface Modification, Benzene, Toluene
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.6 No.6,
May
8,
2015
ABSTRACT: In
this work, we determined the surface characteristics of natural (CA-1) and HNO3 treated (CA-2) CAG. Equilibrium, kinetics and breakthrough for adsorption of
benzene and toluene by CA-1 and CA-2 were studied. Concentrations of benzene
and toluene (mg/L) were determined by gas chromatography with headspace
extraction. The data of adsorption kinetic and equilibrium were best fitted by
pseudo-second order model and Langmuir isotherm, respectively. The best results
of benzene and toluene adsorption from fixed bed were obtained at volumetric
flow rate (Q1 = 70 mL/min)
using adsorbent CA-2. The study of inferential statistics revealed that CA-1
and CA-2 adsorbents are statistically different at a 5% significance level.