Kinetics and equilibrium of Cu(II) adsorption onto chemically modified orange peel cellulose biosorbents |
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| Authors: | Dandan Lu Qilin Cao Xiaomin Li Xiuju Cao Fang Luo Wenjing Shao |
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| Affiliation: | 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;1. Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;2. Department of Soils and Water, Faculty of Agriculture, Assiut University, The New Valley Branch, New Valley Governorate, Egypt |
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| Abstract: | A series of orange peel cellulose biosorbents has been specifically prepared by different chemical modifications to understand the mechanism of copper adsorption from chloride solutions. The different biosorbents and raw orange peels were characterized using elemental analysis and Fourier transform infrared spectroscopy (FTIR). The acidic and basic sites and pH of zero charge were also determined. The influences of pH, contact time, initial copper concentration and solid/liquid ratio on copper removal were examined. The maximum adsorption capacity of copper was 1.22 mol/kg, using orange peel esterified by 0.6 mol/L citric acid at 80 °C after 0.1 mol/L NaOH saponification. A comparison of different isotherm models revealed that the combination of Langmuir and Freundlich (L–F) isotherm model fitted the experimental data best. Results indicate that the chemically modified orange peel cellulose can provide an efficient and cost-effective technology for eliminating copper from aqueous solution. |
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