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Original Articles Open Access
The study was conducted for the removal of Methylene blue dye from aqueous solutions onto citric acid modified leaves of Ricinus communis (CALRC). The properties of this adsorbent were characterized by Yield, Iodine value, surface acidity and basicity, Boehm’s titration, zeta potential and FTIR measurements. Adsorption experiments were carried out systematically by batch mode experiments to investigate the influence of different factors, such as contact time, initial concentration of dye solution and pH of the solutions. The maximum adsorption of MB dye was observed at 5.26 pH for CALRC (81.29 %). The Langmuir, Freundlich, Temkin and Dubin-Radushkevich isotherm models were used to analyze the equilibrium data. The data were also fitted to kinetic models such as pseudo-first order, pseudo-second order, Intra particle and Elovich model. The adsorption equilibrium data were well fitted by the Langmuir model. Kinetic studies showed that the adsorption followed pseudo-second order model and intra particle diffusion also. According to the experimental results, the adsorbent derived from this material is expected to be an economical product for metal ion remediation from water and waste water.
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Author(s): M Makeswari T Santhi and M R Ezhilarasi
Adsorption, Chemisorption, Citric acid, leaves of Ricinus communis, Langmuir isotherm and Pseudo - second-order kinetics., methylene blue dye