Adsorption of emerging contaminants by graphene related materials and their alginate composite hydrogels

Tunioli, Francesca and Khaliha, Sara and Mantovani, Sebastiano and Bianchi, Antonio and Kovtun, Alessandro and Xia, Zhenyuan and Sorayani Bafqi, Mohammad Sajad and Saner Okan, Burcu and Marforio, Tainah Dorina and Calvaresi, Matteo and Palermo, Vincenzo and Navacchia, Maria Luisa and Melucci, Manuela (2023) Adsorption of emerging contaminants by graphene related materials and their alginate composite hydrogels. Journal of Environmental Chemical Engineering, 11 (2). ISSN 2213-3437 (Print) 2213-2929 (Online)

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Graphene nanosheets and nanoplatelets -alginate composite hydrogels were prepared by ionic gelation and the resulting gel beads were exploited for the removal of a mixture of eight selected emerging contaminants (ECs) in tap water, including bisphenol A, ofloxacin and diclofenac. The role of graphene related materials (GRM) on the gel bead structure, adsorption selectivity, kinetic, mechanism, and efficiency was investigated. Combined Scanning Electron Microscopy (SEM) and confocal Raman microscopy mapping showed a porous structure with pore size in the range of 100–200 µm and a homogeneous distribution of graphene nanosheets or nanoplatelets at the pores surface. The adsorption kinetic of GRM was much faster than that of granular activated carbon (GAC), the industrial sorbent benchmark, with removal capacity of ofloxacin from 2.9 to 4.3 times higher. A maximum adsorption capacity of 178 mg/g for rhodamine B was estimated by adsorption isotherm studies for reduced graphene oxide-based beads (a value comparable to that of powered activated carbon). Regeneration test performed on saturated beads by washing with EtOH, and subsequent reiterated reuses, showed no loss of adsorption performance up to the fourth reuse cycle.
Item Type: Article
Uncontrolled Keywords: Alginate; Emerging contaminants; Graphene related materials; Polymer-graphene composites; Water purification
Divisions: Faculty of Engineering and Natural Sciences
Sabancı University Nanotechnology Research and Application Center
Depositing User: Burcu Saner Okan
Date Deposited: 07 May 2023 19:37
Last Modified: 07 May 2023 19:37

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