Adsorption Study of 1-chloro-4-nitrobenzen onto Single-walled Carbon Nanotubes

Water contamination is mainly caused by industrial effluents which contain several non-biodegradable compounds that can be harmful to the environment. Adsorption is one of the most commonly used methods in water treatment processes. It is interesting due to it easy operation and the availability of a wide variety of commercial adsorbents [1]. Some common adsorbents are activated carbon, fly ash, crab shell, coconut shell, zeolite, manganese oxides and rice husk [2]. In this study the effect of pH, initial concentration of 1-chloro-4-nitrobenzen and adsorbent dosage on its adsorption has been investigated. The results show that 1-chloro-4-nitrobenzen removal decreased at higher initial 1-chloro-4-nitrobenzen concentration, due to decrease of available sites of adsorption at higher concentrations [3] and increased by increasing adsorbent doses due to increased adsorption surface area, which increased the availability of adsorption sites [4]. Maximum adsorption of 1-chloro-4-nitrobenzen was obtained at pH=6 results show that the adsorption of 1-chloro-4-nitrobenzen slightly increases with an increase in temperature that might be due to the increase of diffusion on adsorbent surfaces with increasing activity of 4NCB[5]. Langmuir, Freundlich and Temkin isotherm models were used to test the equilibrium data and results revealed that adsorption could be better described by Freundlich isotherm. The Freundlich. model is an empirical model allowing for multilayer adsorption on sorbent [2].