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Equilibrium, kinetic and thermodynamic study of pesticides removal from water using novel glucamine-calix[4]arene functionalized magnetic graphene oxide

Abstract

A novel nanocomposite of MGO-NGC, composed of magnetic Fe3O4 nanoparticles (M), graphene oxide (GO) and N-methyl-D-glucamine functionalized calix[4]arene (NGC) was synthesized and applied as an effective adsorbent for the removal of two selected pesticides, hexaconazole and chlorpyrifos from water samples. The adsorbent was characterized by FTIR, SEM, EDX, TEM and XRD. The main parameters affecting the adsorption process such as adsorbent dosage, pH of sample solution, salt effect, pesticides concentration, and adsorption time were investigated. The data from kinetic studies were fitted well to pseudo-second-order kinetic model with R2 > 0.99. Among the isotherm models of Langmuir, Freundlich, Temkin and Dubinin-Radushkevich, the Langmuir isotherm is fitted well to adsorption process and demonstrated monolayer adsorption pattern for pesticides. Moreover, high adsorption capacities of 78.74 mg g-1 and 93.46 mg g-1 were obtained for chlorpyrifos and hexaconazole, respectively. Thermodynamic and free energy data showed physisorption mechanism for adsorption process. The new adsorbent can be employed as an efficient, environmental friendly and highly reusable alternative for removal of chlorinated pesticides from aqueous media.

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Publication details

The article was received on 17 Nov 2018, accepted on 03 Feb 2019 and first published on 05 Feb 2019


Article type: Paper
DOI: 10.1039/C8EM00530C
Citation: Environ. Sci.: Processes Impacts, 2019, Accepted Manuscript

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    Equilibrium, kinetic and thermodynamic study of pesticides removal from water using novel glucamine-calix[4]arene functionalized magnetic graphene oxide

    H. Rashidi Nodeh, A. Kamboh, W. A. Wan Ibrahim, B. Hadi Jume, H. Sereshti and M. M. Sanagi, Environ. Sci.: Processes Impacts, 2019, Accepted Manuscript , DOI: 10.1039/C8EM00530C

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