| Title | Graphene oxide nanosheets for drinking water purification by tandem adsorption and microfiltration |
| Abstract | Graphene nanosheets have outstanding adsorption efficiency toward organic molecules but the potential as sorbent for water purification is strongly limited by the tedious recovery of the nanosheets after the treatment, which can cause secondary contaminations. Here, we demonstrate that graphene oxide (GO) and reduced GO (rGO) nanosheets aggregation in tap water, enabling their separation by dead-end microfiltration (MF) on commercial polymeric hollow fiber modules. No evidence of GO/rGO contamination was found in microfiltered water and chemical potability of treated water was confirmed by standard protocols. Moreover, GO/rGO can be recovered (by inverting the filtration modality from IN-OUT to OUT-IN), washed and reused, this allowing the regeneration and reuse of both graphene nanosheets and the filtration module. The procedure (called here GO + MF) was optimized on tap water spiked with ofloxacin (OFLOX) or methylene blue (MB), as reference. The optimized procedure was then applied both with GO and rGO to the removal of a mixture of perfluoroalkyl substances (PFASs) from tap water at ?g/L levels, the highest concentration found in water resources abstracted for water consumption. We demonstrate that rGO + MF procedure allows to remove 138 ?g/g of total PFASs in only 30 min, i.e. an efficiency 3-5 times higher than granular activated carbon (43 ?g/g) used in real potabilization plants for PFASs removal. |
| Source | Separation and purification technology (Print) 300, pp. 121826 |
| Keywords | water purificationadsorptionmicrofiltration |
| Journal | Separation and purification technology (Print) |
| Editor | Elsevier, New York ;, Paesi Bassi |
| Year | 2022 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.seppur.2022.121826 |
| Authors | Khaliha, Sara and Bianchi, Antonio and Kovtun, Alessandro and Tunioli, Francesca and Boschi, Alex and Zambianchi, Massimo and Paci, Davide and Bocchi, Letizia and Valsecchi, Sara and Polesello, Stefano and Liscio, Andrea and Bergamini, Michela and Brunetti, Maurizia and Navacchia, Maria Luisa and Palermo, Vincenzo and Melucci, Manuela |
| Text | 471753 2022 10.1016/j.seppur.2022.121826 ISI Web of Science WOS 000843473800005 Scopus 2 s2.0 85135724294 water purification adsorption microfiltration Graphene oxide nanosheets for drinking water purification by tandem adsorption and microfiltration Khaliha, Sara and Bianchi, Antonio and Kovtun, Alessandro and Tunioli, Francesca and Boschi, Alex and Zambianchi, Massimo and Paci, Davide and Bocchi, Letizia and Valsecchi, Sara and Polesello, Stefano and Liscio, Andrea and Bergamini, Michela and Brunetti, Maurizia and Navacchia, Maria Luisa and Palermo, Vincenzo and Melucci, Manuela Institute for Organic Synthesis and Photoreactivity CNR ISOF , Consiglio Nazionale delle Ricerche, via Piero Gobetti 101, 40129 Boloca BO , Italy Medica Spa, via degli Artigiani 7, 41036 Medolla MO , Italy Water Research Institute CNR IRSA , Consiglio Nazionale delle Ricerche, Via del Mulino 19, 20861 Brugherio MB , Italy Consiglio Nazionale delle Ricerche Istituto per la microelettronica e microsistemi CNR IMM , via del Fosso del Cavaliere 100, 00133 Roma RM , Italy HERA SpA Direzione Acqua, Viale Carlo Berti Pichat 2/4, 40127 Bologna BO , Italy Graphene nanosheets have outstanding adsorption efficiency toward organic molecules but the potential as sorbent for water purification is strongly limited by the tedious recovery of the nanosheets after the treatment, which can cause secondary contaminations. Here, we demonstrate that graphene oxide GO and reduced GO rGO nanosheets aggregation in tap water, enabling their separation by dead end microfiltration MF on commercial polymeric hollow fiber modules. No evidence of GO/rGO contamination was found in microfiltered water and chemical potability of treated water was confirmed by standard protocols. Moreover, GO/rGO can be recovered by inverting the filtration modality from IN OUT to OUT IN , washed and reused, this allowing the regeneration and reuse of both graphene nanosheets and the filtration module. The procedure called here GO MF was optimized on tap water spiked with ofloxacin OFLOX or methylene blue MB , as reference. The optimized procedure was then applied both with GO and rGO to the removal of a mixture of perfluoroalkyl substances PFASs from tap water at g/L levels, the highest concentration found in water resources abstracted for water consumption. We demonstrate that rGO MF procedure allows to remove 138 g/g of total PFASs in only 30 min, i.e. an efficiency 3 5 times higher than granular activated carbon 43 g/g used in real potabilization plants for PFASs removal. 300 Published version https //www.sciencedirect.com/science/article/pii/S1383586622013818 via%3Dihub This is an open access article distributed under the terms of the Creative Commons CC BY license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Articolo in rivista Elsevier 1383 5866 Separation and purification technology Print Separation and purification technology Print Separation and purification technology. Print BOSCHI ALEX BIANCHI ANTONIO KHALIHA SARA TUNIOLI FRANCESCA stefano.polesello POLESELLO STEFANO marialuisa.navacchia NAVACCHIA MARIA LUISA vincenzo.palermo PALERMO VINCENZO manuela.melucci MELUCCI MANUELA andrea.liscio LISCIO ANDREA alessandro.kovtun KOVTUN ALESSANDRO saramaria.valsecchi VALSECCHI SARA MARIA massimo.zambianchi ZAMBIANCHI MASSIMO |
