title: Adsorption of bentazone herbicide onto mesoporous silica: application to environmental water purification.
abstract: Within the last few years, the presence of bentazone herbicide has been observed in many water resources. For the first time, removal of bentazone using mesoporous silica was investigated revealing reversible adsorption. The adsorption isotherm was well described using the Freundlich model. The affinity towards bentazone is strongly affected by pH in the range of 2-7, decreasing with the increase of the pH, becoming negligible at the neutrality. Regeneration of the adsorbent was possible, and a recovery as high as 70 % was obtained using CH3OH-NaOH solution. Furthermore, appreciable recovery (47 %) was also obtained using water. Applications on the purification of lake water and wastewaters, both characterized by a significant organic carbon load, spiked with 2 mg L(-1) bentazone were tested, observing removal yields in the range of 61-73 %. Taking advantage of the fast adsorption kinetics observed, an in-flow purification treatment was set-up, with quantitative removal of bentazone from polluted water.
authors.affiliation: Department of Chemistry, University of Turin, Via Pietro Giuria 5, 10125, Turin, Italy. mariaconcetta.bruzzoniti@unito.it.
authors.forename: M C
authors.identifier: http://orcid.org/0000-0002-9144-9254
authors.initials: MC
authors.lastname: Bruzzoniti
authors.affiliation: Department of Chemistry, University of Turin, Via Pietro Giuria 5, 10125, Turin, Italy.
authors.forename: R M
authors.initials: RM
authors.lastname: De Carlo
authors.affiliation: Department of Chemistry, University of Turin, Via Pietro Giuria 5, 10125, Turin, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Rivoira
authors.affiliation: Department of Chemistry, University of Florence, Via della Lastruccia 13, 50019, Sesto Fiorentino, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Del Bubba
authors.affiliation: Department of Applied Science and Technology, Polytechnic of Turin, Corso Duca degli Abruzzi 24, 10129, Turin, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Pavani
authors.affiliation: Department of Chemistry, University of Turin, Via Pietro Giuria 5, 10125, Turin, Italy.|Department of Applied Science and Technology, Polytechnic of Turin, Corso Duca degli Abruzzi 24, 10129, Turin, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Riatti
authors.affiliation: Department of Applied Science and Technology, Polytechnic of Turin, Corso Duca degli Abruzzi 24, 10129, Turin, Italy.
authors.forename: B
authors.initials: B
authors.lastname: Onida
mesh_terms: D000327:Adsorption; D001581:Benzothiadiazines / Q000737:chemistry*; D004777:Environment; D006540:Herbicides / Q000737:chemistry*; D007700:Kinetics; D012822:Silicon Dioxide / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D001581:Benzothiadiazines; D006540:Herbicides; D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide; C002003:bentazone
keywords: Adsorption; Bentazone; Lake water; Mesoporous silica; Removal; Wastewater