Kinetics and Mechanism Study of Chemical Pollutant Adsorption Using Organic Ligands Modified Nano-adsorbents

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Abdollahi Zad, Ghazal | 2021

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 53966 (03)
University: Sharif University of Technology
Department: Chemistry
Advisor(s): Golami, Mohammad Reza
Abstract:
Among various methods for purifying water from dyes, adsorption takes advantage of simplicity, high efficiency, no secondary-pollution, and inexpensiveness. In this project Halloysite nanoparticles were applied to prepare a series of modified polyAcrylamide- quince seed gum hydrogels (QS/PAAm/Haln). The obtained hydrogels demonstrated improved efficiency as adsorbent in removing methylene blue (MB) from aqueous media. The structure of the prepared hydrogel nanocomposites were identified by X-ray diffraction, Brunauer-Emmett-Teller surface area analysis, Fourier-transform infrared spectroscopy, scanning electron microscope and energy-dispersive X-ray spectroscopy. Kinetics, thermodynamic, isotherms and the effect of pH of MB adsorption were investigated. The obtained results suggested that the adsorption kinetics complied with the pseudo-first-order model. Investigating the pH effect on dye adsorption performance indicated that QS/PAAm/Hal5 hydrogel has 94.3% removal efficiency at pH=7 after 6 hours. The experimental results at different temperatures confirmed spontaneous and exothermic adsorption process
Keywords:
Adsorption ; Halloysite ; Hydrogel ; Adsorption Isotherms ; Thermodynamics ; Kinetic Model ; Adsorption Kinetics ; Dye Removal

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