title: Sorption potential of different biomass fly ashes for the removal of diuron and 3,4-dichloroaniline from water.
abstract: Hazardous contaminants in water and biomass fly ash spillage are causes for environmental and health concern. We selected five fly ashes generated from olive-mill (O,P, G and H) and greenhouse vegetable (I) waste used as biomass fuel in order to quantify their capacity to remove diuron and 3,4-dichloroaniline (DCA) from water. To understand the sorption processes involved, four kinetic models and two adsorption isotherms were assayed. The pseudo second-order kinetic showed the best fit (R2>0.99). The initial adsorption rate constant was found to be faster for DCA than for diuron. The Freundlich adsorption constants of ashes O, P, G and H for diuron were more than 2-fold higher than for DCA (Kf=109-16μg1-1/ng-1mL-1). The alkaline pH of these fly ashes plays an important role in the adsorption process. Sorption/desorption processes were significantly affected by iron oxide content. DCA sorption was also influenced by particle size and carbon content. Low hysteresis coefficient values (H=0.01-0.26) revealed an irreversible sorption process. The study presents novel information on the immobilization of hazardous chemicals in water by biomass fly ashes generated from olive-oil industry and greenhouse crop waste.
authors.affiliation: Department of Environmental Protection, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas (EEZ-CSIC), C/Profesor Albareda 1, 18008 Granada, Spain.
authors.forename: Mar
authors.initials: M
authors.lastname: Quirantes
authors.affiliation: Department of Environmental Protection, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas (EEZ-CSIC), C/Profesor Albareda 1, 18008 Granada, Spain.
authors.forename: Rogelio
authors.initials: R
authors.lastname: Nogales
authors.affiliation: Department of Environmental Protection, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas (EEZ-CSIC), C/Profesor Albareda 1, 18008 Granada, Spain. Electronic address: esperanza.romero@eez.csic.es.
authors.forename: Esperanza
authors.initials: E
authors.lastname: Romero
mesh_terms: D000327:Adsorption; D000814:Aniline Compounds / Q000302:isolation & purification*; D018533:Biomass; D060729:Coal Ash / Q000737:chemistry*; D004237:Diuron / Q000302:isolation & purification*; D005735:Garbage; D007700:Kinetics; D008956:Models, Chemical; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
chemical_list: D000814:Aniline Compounds; D060729:Coal Ash; D014874:Water Pollutants, Chemical; C014464:3,4-dichloroaniline; D004237:Diuron
keywords: 3,4-Dichloroaniline; Biomass fly ashes; Diuron; Sorption processes; Water decontamination