Journal of North Khorasan

Abstract Background & objectives: The treatment of textile industries wastewater due to excessive coloring matter and pollution is one of the environmental health experts concerns. As, adsorption is one of the effective process in colorfully wastewater treatment. The aim of this study was surveying about introducing an inexpensive and available adsorbent capability, orange peel ash, in removal of Direct Black 22 Dye from aqueous environments. Material & Methods: In this study, orange peel ash was produced in vitro. The elimination of direct black 22 was studied in aqueous solution in a batch system by the adsorbent. Therefore, the effect of operational parameters such as contact time, pH, initial concentration of soluble dye Direct Black 22 and the adsorbent dosages were investigated. Measurements were performed using a UV-Visible spectrophotometer at a wavelength of 585.5 nm. Finally, adsorption isotherm and kinetic analyses were carried out. Results: data showed high selectivity and efficiency of orange peel ash to rapidly remove the color from solution and equilibrium was achieved within 90 minutes. Maximum removal of color (95.2%) was observed at pH=2. Adsorption efficiency was reduced with increasing initial concentration of dye solution and decreasing the adsorbent dose. Adsorption isotherm studies revealed the binding occurred within surface and correlated with the Freundlich model. Kinetic models indicated a correlation between the adsorption processes with the pseudo second kinetic model. Conclusion: pH affects the cell surface and on physical-chemical reactions and adsorption sites. At low concentrations of color soluble, adsorption sites absorbed dye more easily, but at higher concentrations colored ions must be penetrated into the inner places. According to the results, the carbon obtained from orange peel as an agricultural product, showed good performance for Direct Black 22 dye.