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.
Highlights
In recent years, with increasing population and industrial activity, intensified concerns regarding water quality, among these groundwater has received special attention
The present study reports the influence of surface modification of HNO3 treated CAG for adsorption of benzene and toluene from aqueous solutions, and use of the inferential statistical analysis for the treatment of experimental adsorption data
Adsorbent CA-2 was obtained from CA-1 by treated with 6 M HNO3, according to the procedure described by Elhendawy [16]
Summary
With increasing population and industrial activity, intensified concerns regarding water quality, among these groundwater has received special attention. Contamination of water and soil by volatile organic compounds (VOCs), as a result of accidents or spills (fuel) and wastewater industrial today poses serious problems to public health [1]. Volatile organic compounds such as benzene and toluene are found frequently in the wastewater from paint industries, adhesives, plastics, petrochemicals, among others [2]. Activated carbon (CA) has been used as adsorbent for the removal of a wide variety of organic and inorganic pollutants from aqueous media [6]. CA adsorption has been cited by the North American Environmental Protection Agency (USEPA) as one of the best available technologies in environmental control [9]
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