Document Type : Original Article

Authors

• Eman R Mahdi ¹
• Elaf A Shihab ¹
• Alaa H Fahmi ²

¹ Department of Animal Production, College of Agriculture, University of Diyala. Diyala, Iraq.

² Department of Soil Science and Water Recourses, College of Agriculture, University of Diyala. Diyala, Iraq.

Abstract

Biochar has been successfully used to treat wastewater. The adsorption capacity of biochar and their properties depended on the temperature used at their production as well as on each type of feedstock. In this study biochar was produced from sugarcane bagasse at 500 oC and 650 oC, to investigate the adsorption behavior of crystal violet dye (CV). The batch technique was used to investigate the effects of physiochemical parameters (contact time and initial dye concentration). The data was submitted to first and second pseudo-order kinetic models. These equations were used to characterize the dye kinetics adsorption process. The study's findings demonstrated that the pseudo-second-order equation was the best fit for the kinetic studies (R2 = 1 and R2 = 0.9998) for both biochar 500 oC and biochar 650 oC, respectively. Furthermore, the quantity equilibrium (q values) calculated (qecal) from the pseudo-second-order were highly consistent with experimental q values (qeexp) compared to those calculated from the pseudo-first-order. Freundlich and Langmuir’s adsorption isotherm models were used to calculate the adsorption constants. Freundlich adsorption isotherm correlation coefficient (R2) values for biochar at 500 °C and biochar at 650 oC were 0.9944 and 0.9751, respectively. This finding indicates that crystal violet adsorption data can be best suited by the Freundlich adsorption isotherm.

Keywords

• Adsorption
• Crystal violet
• Biochar
• Isotherm
• Kinetics

Main Subjects

• chemistry