Synthesis of Graphene by New Methods, and its Application for Adsorption of Cobalt

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Faham Mofrad, Ali | 2020

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 53470 (46)
University: Sharif University of Technology
Department: Energy Engineering
Advisor(s): Outokesh, Mohammad; Shafiekhani, Azizollah
Abstract:
In this study graphene and graphene adsorbent for the Co2+ ion were created from sodium phenoxide and calcium phenoxide, respectively, using the chemical vapor deposition method, and their chemical, physical, and morphological properties were investigated using FT-IR, UV, XRD, Raman, TEM, FE-SEM, and XPS. The results suggest that the optimum reaction condition for synthesizing mono-layer and multi-layer graphene is the 750 °C temperature for 30 min. The Co2+ adsorbing properties of the synthesized graphene adsorbent from calcium phenoxide was investigated. The investigation of solvation properties suggests insolubility above 650 °C and the kinetic data suggest the rapidness of the Co2+ adsorption on the adsorbent and that the adsorption follows second-order kinetics. Adsorption isotherm data suggest an adsorption capacity of 282 mg/g at pH 2 and 604 mg/g at pH 3. The isotherm data fitted well with the Langmuir model at pH 3 (R2 = 0.9999). The effect of the sodium ion as the intruding ion in adsorption was investigated. In pH 2 the adsorption capacity of Co2+ was decreased by an increase in the sodium ion, but no effect was observed in pH 3
Keywords:
Cobalt ; Chemical Vapor Deposition (CVD) ; Graphene Production ; Adsorption ; Ion Adsorption ; Adsorption Kinetics

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