Defective graphene nanosheets for drinking water purification: Adsorption mechanism, performance, and recovery

Khaliha, Sara and Marforio, Tainah Dorina and Kovtun, Alessandro and Mantovani, Sebastiano and Bianchi, Antonio and Navacchia, Maria Luisa and Zambianchi, Massimo and Bocchi, Letizia and Boulanger, Nicoals and Iakunkov, Artem and Calvaresi, Matteo and Talyzin, Alexander V. and Palermo, Vincenzo and Melucci, Manuela Defective graphene nanosheets for drinking water purification: Adsorption mechanism, performance, and recovery. FlatChem. ISSN 2452-2627


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Defect-rich graphene oxide (dGO) was used as sorbent for organic contaminants of emerging concern in tap water, including drugs and dyes, and the performance compared to those of lower-defects graphene types. The role of holes and carbonyl- carboxylic groups on graphene nanosheets surface on the adsorption mechanism and efficiency was investigated. dGO showed enhanced adsorption capacity toward two fluoroquinolone antibiotics (ofloxacin, OFLOX, and ciprofloxacin, CIPRO) in tap water with a maximum capacity of 650 mg/g, compared to 204 mg/g for Hummers derived commercial GO (hGO) and 125 mg/g for less defected Brodie derived GO (bGO) for OFLOX. The role of defects on the selective adsorption of OFLOX was also modelled by MD simulations, highlighting a mechanism mainly driven by the shape complementarity between the graphene holes and the molecules. Adsorption isotherms revealed different adsorption model for dGO, with a Langmuir fitting for dGO and BET fitting for all the other investigated samples. The maximum adsorption capacity of dGO for OFLOX was about six times higher than that of Granular Activated Carbon (95 mg/g), the industrial adsorption standard technology. Finally, it was also demonstrated that dGO can be recovered from treated water by ultrafiltration, this preventing secondary contamination risks and enabling safe use of graphene nanosheets for water purification.

Item Type: Article
Uncontrolled Keywords: GrapheneAdsorptionSurface interactionWater treatmentEmerging contaminants
Subjects: 500 Scienze naturali e Matematica
500 Scienze naturali e Matematica > 540 Chimica e scienze connesse
Depositing User: Vincenzo Palermo
Date Deposited: 05 Nov 2021 10:05
Last Modified: 05 Nov 2021 10:05

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