title: Removal of diethyl phthalate from water solution by adsorption, photo-oxidation, ozonation and advanced oxidation process (UV/H₂O₂, O₃/H₂O₂ and O₃/activated carbon).
abstract: The objective of this work was to compare the effectiveness of conventional technologies (adsorption on activated carbon, AC, and ozonation) and technologies based on advanced oxidation processes, AOPs, (UV/H(2)O(2), O(3)/AC, O(3)/H(2)O(2)) to remove phthalates from aqueous solution (ultrapure water, surface water and wastewater). Diethyl phthalate (DEP) was chosen as a model pollutant because of its high water solubility (1,080 mg/L at 293 K) and toxicity. The activated carbons showed a high adsorption capacity to adsorb DEP in aqueous solution (up to 858 mg/g), besides the adsorption mechanism of DEP on activated carbon is governed by dispersive interactions between π electrons of its aromatic ring with π electrons of the carbon graphene planes. The photodegration process showed that the pH solution does not significantly affect the degradation kinetics of DEP and the first-order kinetic model satisfactorily fitted the experimental data. It was observed that the rate of decomposition of DEP with the O(3)/H(2)O(2) and O(3)/AC systems is faster than that with only O(3). The technologies based on AOPs (UV/H(2)O(2), O(3)/H(2)O(2), O(3)/AC) significantly improve the degradation of DEP compared to conventional technologies (O(3), UV). AC adsorption, UV/H(2)O(2), O(3)/H(2)O(2), and O(3)/AC showed a high yield to remove DEP; however, the disadvantage of AC adsorption is its much longer time to reach maximum removal. The best system to treat water (ultrapure and natural) polluted with DEP is the O(3)/AC one since it achieved the highest DEP degradation and TOC removal, as well as the lower water toxicity.
authors.affiliation: Centro de Investigación y Estudios de Posgrado, Facultad de Ingeniería, Universidad Autónoma de San Luis Potosí, Av. Dr. M. Nava No.6, San Luis de Potosí 78290, Mexico.
authors.forename: Nahum A
authors.initials: NA
authors.lastname: Medellin-Castillo
authors.forename: Raúl
authors.initials: R
authors.lastname: Ocampo-Pérez
authors.forename: Roberto
authors.initials: R
authors.lastname: Leyva-Ramos
authors.forename: Manuel
authors.initials: M
authors.lastname: Sanchez-Polo
authors.forename: José
authors.initials: J
authors.lastname: Rivera-Utrilla
authors.forename: José D
authors.initials: JD
authors.lastname: Méndez-Díaz
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D007700:Kinetics; D016877:Oxidants / Q000737:chemistry*; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry; D010795:Phthalic Acids / Q000737:chemistry / Q000302:isolation & purification* / Q000528:radiation effects; D012996:Solutions; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification* / Q000528:radiation effects; D018508:Water Purification / Q000379:methods*
chemical_list: D016877:Oxidants; D010795:Phthalic Acids; D012996:Solutions; D014874:Water Pollutants, Chemical; D002606:Charcoal; D010126:Ozone; D006861:Hydrogen Peroxide; C007379:diethyl phthalate