| Abstract | Due to water depletion and increasing level of pollution from standard and emerging contaminants, the development of more efficient purification materials and technology for drinking water treatment is a crucial challenge to be addressed in the near future. Graphene oxide (GO) has been pointed as one of the most promising materials to build structure and devices for new adsorbents and filtration systems. Here, we analyzed two types of GO doped 3D chitosan-gelatin aerogels with GO sheets embedded in the bulk or deposited on the surface. Through combined structural characterization and adsorption tests on selected proxies of drinking water micropollutants, we compared both GO-embedded and GO-coated materials and established the best architecture for achieving enhanced removal efficiency toward contaminants in water. To evaluate the best configuration, we studied the adsorption capacity of both systems on two organic molecules (i.e., fluoroquinolonic antibiotics ofloxacin and ciprofloxacin) and a heavy metal (lead Pb2+) of great environmental relevance and with already proved high affinity for GO. The Pb monolayer maximum adsorption capacity q(max) was 11.1 mg/g for embedded GO aerogels and 1.5 mg/g in coated GO-ones. Only minor differences were found for organic contaminants between coating and embedding approaches with an adsorption capacity of 5-8 mg/g and no adsorption was found for chitosan-gelatin control aerogels without GO. Finally, potential antimicrobial effects were found particularly for the GO-coated aerogels materials, thus corroborating the multifunctionality of the newly developed porous structures. (C) 2020 Elsevier Ltd. All rights reserved. |
| Authors | Kovtun, Alessandro; Campodoni, Elisabetta; Favaretto, Laura; Zambianchi, Massimo; Salatino, Anastasio; Amalfitano, Stefano; Navacchia, Maria Luisa; Casentini, Barbara; Palermo, Vincenzo; Sandri, Monica; Melucci, Manuela |
| Text | 432343 2020 10.1016/j.chemosphere.2020.127501 ISI Web of Science WOS 000566573600103 Graphene oxide aerogels Chitosan Drinking water Lead Antibiotics Adsorption Multifunctional graphene oxide/biopolymer composite aerogels for microcontaminants removal from drinking water Kovtun, Alessandro; Campodoni, Elisabetta; Favaretto, Laura; Zambianchi, Massimo; Salatino, Anastasio; Amalfitano, Stefano; Navacchia, Maria Luisa; Casentini, Barbara; Palermo, Vincenzo; Sandri, Monica; Melucci, Manuela Institute of Organic Synthesis and Photoreactivity CNR ISOF Via Piero Gobetti 101, 40129, Bologna, Italy Institute of Science and Technology for Ceramics CNR ISTEC , Via Granarolo, 64 48018, Faenza, RA, Italy Water Research Institute CNR IRSA , Via Salaria Km 29,300 C.P, 10 00015, Monterotondo Stazione, RM, Italy Chalmers University of Technology, Industrial and Materials Science, Horsalsvagen 7A, SE 412 96, Goteborg, Sweden Due to water depletion and increasing level of pollution from standard and emerging contaminants, the development of more efficient purification materials and technology for drinking water treatment is a crucial challenge to be addressed in the near future. Graphene oxide GO has been pointed as one of the most promising materials to build structure and devices for new adsorbents and filtration systems. Here, we analyzed two types of GO doped 3D chitosan gelatin aerogels with GO sheets embedded in the bulk or deposited on the surface. Through combined structural characterization and adsorption tests on selected proxies of drinking water micropollutants, we compared both GO embedded and GO coated materials and established the best architecture for achieving enhanced removal efficiency toward contaminants in water. To evaluate the best configuration, we studied the adsorption capacity of both systems on two organic molecules i.e., fluoroquinolonic antibiotics ofloxacin and ciprofloxacin and a heavy metal lead Pb2 of great environmental relevance and with already proved high affinity for GO. The Pb monolayer maximum adsorption capacity q max was 11.1 mg/g for embedded GO aerogels and 1.5 mg/g in coated GO ones. Only minor differences were found for organic contaminants between coating and embedding approaches with an adsorption capacity of 5 8 mg/g and no adsorption was found for chitosan gelatin control aerogels without GO. Finally, potential antimicrobial effects were found particularly for the GO coated aerogels materials, thus corroborating the multifunctionality of the newly developed porous structures. C 2020 Elsevier Ltd. All rights reserved. 259 Published version PDF of the paper 2020 Chemosphere 259, 127501.pdf Articolo in rivista Elsevier 0045 6535 Chemosphere Chemosphere Chemosphere Chemosphere. Chemosphere. Environmental chemistry, Chemosphere. Persistent organic pollutants and dioxins, Chemosphere. Environmental toxicology and risk assessment, Chemosphere. Science for Environmental toxicology, alessandro.kovtun KOVTUN ALESSANDRO laura.favaretto FAVARETTO LAURA marialuisa.navacchia NAVACCHIA MARIA LUISA vincenzo.palermo PALERMO VINCENZO monica.sandri SANDRI MONICA manuela.melucci MELUCCI MANUELA stefano.amalfitano AMALFITANO STEFANO barbara.casentini CASENTINI BARBARA elisabetta.campodoni CAMPODONI ELISABETTA massimo.zambianchi ZAMBIANCHI MASSIMO GrapheneCore2 Graphene Flagship Core Project 2 DCM.AD002.160.001 Advanced Materials |
