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Synthesis of Graphene Oxide-based Polymer Nanocomposites and Investigation of Their Ability in Dye Adsorption

Nazari, Mojtaba | 2016

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 49459 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Pourjavadi, Ali
  7. Abstract:
  8. In this project, polymer nanocomposites containing graphene oxide were prepared and used for adsorption of several cationic and anionic dyes. In most cases, these nanocomposites were prepared as three-dimentional polymer networks which contain graphene oxide. Nanocomposites with direct grafting of polymer chains onto the surface of graphene oxide were also prepared. Graphene oxide is an oxidized carbonaceous material with unique properties. This material has high surface area, good mechanical strength and various functional groups. Polymeric compounds with different functional groups, structures and properties can be prepared and used. By preparing composites of graphene oxide and polymers, a combination of the properties of these two materials can be served and high performance materials can be achieved. The effect of graphene oxide on the properties of the composites was investigated and it was found that this material can increase some physical and thermal properties and mechanical strength of the composites. Different synthetic and natural polymers were used for preparing these nanocompsites. The presence of natural polymers increases biodegrability of the compounds. The prepared composites exhibited good performance in adsorption of different dyes. The presence of different functional groups in the structure of the prepared composites increases dye adsorption by the formation of electrostatic interactions and hydrogen bondings. The effect of different conditions such as pH, initial dye concentration, adsorbent dosage, graphene oxide content and porosity on adsorption capacity was investigated. The prepared adsorbents were used for several cycles of adsorption-desorption and no significant loss in their performance was observed
  9. Keywords:
  10. Nanocomposite ; Polymer Nanocomposits ; Adsorption ; Dye Removal ; Polymers

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