Adsorption/desorption of Cd(II), Cu(II) and Pb(II) using chemically modified orange peel: Equilibrium and kinetic studies |
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| Institution: | 1. Research Centre for Soil & Water Resources and Natural Disaster Prevention (SWAN), National Yunlin University of Science & Technology, 123, Section 3, University Road, Douliou, Yunlin 640, Taiwan, ROC;2. Department and Graduate School of Safety and Environment Engineering, National Yunlin University of Science & Technology, 123, Section 3, University Road, Douliou, Yunlin 640, Taiwan, ROC;3. Bachelor Program in Interdisciplinary Studies, College of Future, National Yunlin University of Science & Technology, 123, Section 3, University Road, Douliou, Yunlin 640, Taiwan, ROC;4. School of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China;5. Department of Electrical Engineering, Tunghai University, 1727, Section 4, Taiwan Boulevard, Xitun District, Taichung 407, Taiwan, ROC;1. Laboratory of Soils and Agricultural Chemistry, Department of Natural Resources and Agricultural Engineering, Agricultural University of Athens, Athens GR-118 55, Greece;2. Division of Chemical Technology, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki GR-541 24, Greece;3. Department of Oenology and Beverage Technology, Technological Educational Institute of Kavala, Kavala GR-654 04, Greece |
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| Abstract: | Waste materials from industries such as food processing may act as cost effective and efficient biosorbents to remove toxic contaminants from wastewater. This study aimed to establish an optimized condition and closed loop application of processed orange peel for metals removal. A comparative study of the adsorption capacity of the chemically modified orange peel was performed against environmentally problematic metal ions, namely, Cd2+, Cu2+ and Pb2+, from aqueous solutions. Chemically modified orange peel (MOP) showed a significantly higher metal uptake capacity compared to original orange peel (OP). Fourier Transform Infrared (FTIR) Spectra of peel showed that the carboxylic group peak shifted from 1637 to 1644 cm−1 after Pb (II) ions binding, indicated the involvement of carboxyl groups in Pb(II) ions binding. The metals uptake by MOP was rapid and the equilibrium time was 30 min at constant temperature and pH. Sorption kinetics followed a second-order model. The mechanism of metal sorption by MOP gave good fits for Freundlich and Langmuir models. Desorption of metals and regeneration of the biosorbent was attained simultaneously by acid elution. Even after four cycles of adsorption-elution, the adsorption capacity was regained completely and adsorption efficiency of metal was maintained at around 90%. |
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