Removal of Pb^(2+) Ions from Aqueous Solutions by Modified Magnetic Graphene Oxide: Adsorption Isotherms and Kinetics Studies
سال انتشار: 1399
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 210
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شناسه ملی سند علمی:
JR_IJEE-11-4_005
تاریخ نمایه سازی: 1 اردیبهشت 1400
چکیده مقاله:
Graphene oxide based nano-composites have attracted huge attention for wastewater treatment specially removal of heavy metals. This paper reports adsorption of onto modified magnetic graphene oxide with chitosan and cysteine (GO/ /Chi/Cys). To study the adsorbent morphology, Field Emission Scanning Electron Microscope (FE-SEM) and Fourier Transform Infrared Spectrometer (FTIR) were used in different stages of surface modification. In order to reveal the nature of sorption process, linear forms of different adsorption isotherms such as Langmuir, Freundlich, Tempkin, and Dubinin–Radushkevich were studied. Experimental data were fitted well by Langmuir model with a maximum monolayer coverage capacity ( ) of 86.21 . Prediction of from Langmuir model was in good agreement with maximum empirical adsorption capacity ( =85.4 ). Various types of kinetic models such as pseudo-first-order, pseudo-second-order, Elovich, and intra particle diffusion were investigated to determine characteristic parameters in the adsorption process. The kinetic studies showed that pseudo-second-order model represents the adsorption process better than others due to its high correlation coefficient ( =0.9996). Therefore, the adsorption process is chemisorption.
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نویسندگان
G. Ramezani
Department of Chemical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
S. E. Moradi
Department of Chemistry, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
M. Emadi
Department of Chemistry, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
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