Potential of Canola Stalk as Biosorbent for the Removal of Remazol Black B Reactive Dye from Aqueous Solutions

• Published in: Journal of wood chemistry and technology 2012-10, Vol.32 (4), p.328-341
• Main Authors: Ashori, Alireza, Hamzeh, Yahya, Azadeh, Elham, Izadyar, Soheila, Layeghi, Mohammad, Mirfatahi Niaraki, Mahsa S.
• Format: Article
• Language: English
• Subjects: Adsorption; adsorption isotherm; Canola stalks; Constants; Contact; Dyes; Isotherms; kinetics; Mathematical models; pseudo-second order; reactive dye; Remazol black B; Waste water
• ISSN: 1532-2319; 0277-3813; 1532-2319
• DOI: 10.1080/02773813.2012.688912

In this study, the possible use of canola stalks, which are agricultural residues available in large quantities, for the removal of Remazol Black B (RBB) was investigated. Batch adsorption studies were carried out to examine the influence of various parameters. The results indicated that adsorption was strongly pH-dependent but slightly sorbent dose- and contact time-dependent. The Freundlich and Langmuir adsorption models were used for the mathematical description of adsorption equilibrium and isotherm constants at 25°C. Both models were applicable for the description of dye adsorption isotherm in the concentration range studied. However, the Langmuir model showed a higher correlation coefficient than the Freundlich model. According to the Langmuir model, the highest adsorption capacity was found to be 32.8 mg/g. Kinetic models, pseudo-first order and pseudo-second order were employed to describe the adsorption mechanism. The adsorption data followed the pseudo-second order kinetic model with regression coefficient (R²) higher than 0.999. In conclusion, the results showed that canola stalks could be used as a promising and cost-effective biosorbent for treatment of wastewater containing dye.