title: Clinoptilolite and palygorskite as sorbents of neutral emerging organic contaminants in treated wastewater: Sorption-desorption studies.
abstract: Water reuse for aquifer recharge could be an important route for the introduction of emerging organic contaminants (EOCs) into the environment. The installation of a Horizontal Permeable Reactive Barrier (H-PRB) could constitute a tertiary treatment process to remove EOCs from treated domestic wastewater prior to recharge activities. The sorption-desorption behaviour of six neutral EOCs present in treated domestic wastewater (acetaminophen, caffeine, carbamazepine, cotinine, 4-acetamidoantipyrine (4-AAA) and 4-formylaminoantipyrine (4-FAA)) has been evaluated. Clinoptilolite and palygorskite have been studied as sorbents to be installed in the H-PRB. Batch tests were carried out using an EOC initial concentration ranging from 5 to 100 μg L-1. Apart from acetaminophen and caffeine, both materials showed a limited sorption capacity of neutral EOCs (Kd= 0.63-5.42 L kg-1). In general, the experimental results show that EOCs exhibit a higher sorption affinity for clinoptilolite than for palygorskite. With the exception of carbamazepine, the sorption of the compounds occurs mainly by interactions with mineral surfaces as indicated by the comparison of the partition coefficients into organic matter and into mineral surfaces. According to the molecular geometry of the compounds and the sorption sequences observed, it appears that the dimensions of the organic molecules play a key role in the sorption process. All the studied EOCs exhibit irreversible sorption and sorption-desorption hysteresis.
authors.affiliation: University Rey Juan Carlos, ESCET, Biology and Geology, Physics and Inorganic Chemistry Department, C/Tulipán s/n, 28933 Madrid, Spain; IMDEA Water, Avda. Punto Com, 2, 28805, Alcalá de Henares, Madrid, Spain. Electronic address: maria.leal@urjc.es.
authors.forename: María
authors.initials: M
authors.lastname: Leal
authors.affiliation: IMDEA Water, Avda. Punto Com, 2, 28805, Alcalá de Henares, Madrid, Spain. Electronic address: virtudes.martinez@imdea.org.
authors.forename: Virtudes
authors.initials: V
authors.lastname: Martínez-Hernández
authors.affiliation: IMDEA Water, Avda. Punto Com, 2, 28805, Alcalá de Henares, Madrid, Spain. Electronic address: raffaella.meffe@imdea.org.
authors.forename: Raffaella
authors.initials: R
authors.lastname: Meffe
authors.affiliation: University Rey Juan Carlos, ESCET, Biology and Geology, Physics and Inorganic Chemistry Department, C/Tulipán s/n, 28933 Madrid, Spain; IMDEA Water, Avda. Punto Com, 2, 28805, Alcalá de Henares, Madrid, Spain. Electronic address: javier.lillo@urjc.es.
authors.forename: Javier
authors.initials: J
authors.lastname: Lillo
authors.affiliation: University of Alcalá, Geology, Geography and Environment Department, Faculty of Sciences, External Campus, Ctra. A-II km 33.6, 28871, Alcalá de Henares, Madrid, Spain; IMDEA Water, Avda. Punto Com, 2, 28805, Alcalá de Henares, Madrid, Spain. Electronic address: irene.bustamante@uah.es.
authors.forename: Irene
authors.initials: I
authors.lastname: de Bustamante
mesh_terms: D000327:Adsorption; D000632:Aminopyrine / Q000031:analogs & derivatives / Q000032:analysis; D060587:Groundwater / Q000737:chemistry; D017616:Magnesium Compounds / Q000737:chemistry*; D008962:Models, Theoretical; D004364:Pharmaceutical Preparations / Q000032:analysis*; D017655:Silicon Compounds / Q000737:chemistry*; D013030:Spain; D013499:Surface Properties; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*; D017641:Zeolites / Q000737:chemistry*
chemical_list: D000632:Aminopyrine; D017616:Magnesium Compounds; D004364:Pharmaceutical Preparations; D017655:Silicon Compounds; D062065:Wastewater; D014874:Water Pollutants, Chemical; D017641:Zeolites; C083175:clinoptilolite; C011256:4-formylaminoantipyrine; C026325:attapulgite
keywords: Clinoptilolite; Desorption; EOCs; Palygorskite; Sorption; Treated wastewater