Study on the performance of Cd2+ sorption using dimethylethylenediamine-modified zinc-based MOF (ZIF-8-mmen): optimization of the process by RSM technique |
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| Authors: | Ehsan Binaeian Sina Maleki Nazanin Motaghedi Mehrzad Arjmandi |
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| Affiliation: | 1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fuzhou, Fujian, China;2. Department of Chemical Engineering, Qaemshahr Branch, Islamic Azad University , Qaemshahr, Iran ehsanbina@fjirsm.ac.cn ehsanbinaeian@gmail.com;4. Department of Chemical Engineering, Qaemshahr Branch, Islamic Azad University , Qaemshahr, Iran;5. Chemical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad , Mashhad, Iran |
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| Abstract: | ABSTRACT Cadmium as a highly toxic metal is released into the environment through paper production, metal processing, phosphate fertilizers, insecticides, and treatment of wastewater. Cadmium also inhibits the body activities and is very toxic for kidney and other organisms. In the current study, zinc-based metal–organic framework, zeolitic imidazolate framework (ZIF)-8, was synthesized and modified by dimethylethylenediamine (ZIF-8-mmen) for the removal of cadmium. To optimize the experiments, response surface methodology was applied with three variables including pH, adsorbent dosage, and contact time using central composite design. The optimum conditions for pH, dosage, and time were 2, 0.1 g, and 89 min, respectively, with removal efficiency of 85.38%. The Langmuir isotherm (q m = 1000 mg/g) indicates the monolayer adsorption. The kinetic studies reveal that the Lagergren model was predominant and cadmium was not chemisorbed. Thermodynamic parameters show spontaneous, endothermic, and physisorption processes. |
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| Keywords: | Metal-organic framework (MOF) ZIF-8 dimethylethylenediamine adsorption Cd2+ RSM |
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