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Citric acid modified kenaf core fibres for removal of methylene blue from aqueous solution |
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| Authors: | Sajab Mohd Shaiful Chia Chin Hua Zakaria Sarani Jani Saad Mohd Ayob Mohd Khan Chee Kah Leong Khiew Poi Sim Chiu Wee Siong |
| Institution: | a School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia b Rice and Industrial Crops Research Center, Malaysian Agricultural Research and Development Institute (MARDI), Persiaran MARDI-UPM, 43400 Serdang, Selangor, Malaysia c School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia d Faculty of Engineering, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia e Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University Malaya, 50603 Lembah Pantai, Kuala Lumpur, Malaysia |
| Abstract: | Chemically modified kenaf core fibres were prepared via esterification in the presence of citric acid (CA). The adsorption kinetics and isotherm studies were carried out under different conditions to examine the adsorption efficiency of CA-treated kenaf core fibres towards methylene blue (MB). The adsorption capacity of the kenaf core fibres increased significantly after the citric acid treatment. The values of the correlation coefficients indicated that the Langmuir isotherm fitted the experimental data better than the Freundlich isotherm. The maximum adsorption capacity of the CA-treated kenaf core fibres was found to be 131.6 mg/g at 60 °C. Kinetic models, pseudo-first-order, pseudo-second-order and intraparticle diffusion, were employed to describe the adsorption mechanism. The kinetic data were found to fit pseudo-second-order model equation as compared to pseudo-first-order model. The adsorption of MB onto the CA-treated kenaf core fibres was spontaneous and endothermic. |
| Keywords: | Adsorption isotherms Kenaf fibres Kinetic model Methylene blue Natural adsorbents |
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