IJEP 41(12): 1323-1334 : Vol. 41 Issue. 12 (December 2021)
1. American University of Ras Al Khaimah, Department of Mathematics and Natural Sciences, School of Arts and Sciences, Ras Al Khaimah, UAE
2. American University of Ras Al Khaimah, Department of Biotechnology, School of Arts and Sciences, Ras Al Khaimah, UAE
3. RAK Medical and Health Science University, Department of Pharmaceutical Chemistry, RAK College of Pharmaceutical Sciences, Ras Al Khaimah, UAE
Abstract
Dyes are hazardous pollutants commonly found in dye industry wastewaters and require complex and expensive removal technologies. Our research goal to search for an alternative cheap and eco-friendly adsorbents for wastewater treatment motivated us to explore the application of untreated eucalyptus leaf fibers for the removal of methylene blue dye from aqueous solution by adsorption technique. The influence of various experimental factors, such as contact time, initial dye concentration, adsorbent dosage, temperature and pH of the dye solution in the adsorption process was investigated. The experimental results showed that the extent of adsorption was dependent on dye concentration, contact time, pH, temperature and eucalyptus leaf fiber dose. The equilibrium adsorption data was analyzed using Freundlich, Temkin and Langmuir isotherms and based on the linearized correlation coefficient, the Freundlich equation is the best fit (R2=0.984) to the experimental data in comparison to the other isotherm models. The equilibrium adsorption capacity (qe) increases with the increase in the initial concentration of the dye and decreases with the adsorbent dosage. In this study, the pseudo-second order kinetic model is acceptable (R2 = 1) under different adsorbent dosage and dye concentrations. Furthermore, the calculated equilibrium adsorption capacity (qe) is 0.893 mg/g which is very similar to the actual amount of adsorption equilibrium (0.878 mg/g). The results obtained in this study indicated that eucalyptus leaf fiber is a low cost and effective adsorbent and a suitable alternative to expensive adsorbents in the treatment of dye industry wastewater.
Keywords
Methylene blue, Adsorption, Synthetic dye, Cationic dye, Water purification, Biomass, Eucalyptus leaf
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