title: Naphthalene degradation by catalytic ozonation based on nickel oxide: study of the ethanol as cosolvent.
abstract: Naphthalene (NA) is a polycyclic aromatic hydrocarbon with toxic properties in aquatic systems. Ozonation (O3) and catalytic ozonation (O3-cat) processes are attractive alternatives of degradation for this kind of compound. NA (20 mg L-1) degradation by conventional and catalytic ozonation in the presence of a cosolvent (ethanol) was the aim of this study. This solution was proposed to simulate some aspects of real wastewaters where not only water acts as solvent. Two proportions of the mixture ethanol/water were selected (30:70 and 50:50) with the purpose of studying the cosolvent effect on NA degradation system by ozonation. O3-cat process used nickel oxide as catalyst (0.1 g L-1). The degradation analysis of NA by O3-cat in two different proportions of cosolvent showed that in the case of 30:70 (ethanol/water), a 95 % of NA elimination in 60 min was obtained, while in the case 50:50 (ethanol/water), only 55 % was achieved. The O3process showed similar results of degradation to the initial compound in comparison with catalytic system. According to these results, there is an inhibition effect in pollutant removal by ethanol due to the higher ethanol concentration; the lower elimination rate of NA was obtained (by 40 % during the 60 min). The by-products analysis of ozonation process detected oxalic and formic acids. Treatments with NiO presented less production of organic acids in comparison with conventional ozonation process. The high concentration of ethanol has a relevant factor in the elimination of NA and formation of organic acids; samples with 50 % of cosolvent have showed a higher concentration of organic acids. X-ray photoelectron spectroscopy (XPS) study of O3-cat of diluent (O3-NiO control) and O3-NA-NiO showed the presence of -CO3absorbed on catalyst due to ethanol decomposition.
authors.affiliation: Departamento de Bioprocesos, UPIBI-Instituto Politécnico Nacional, Ticoman, 07340, México, D.F., México.
authors.forename: C Marissa
authors.initials: CM
authors.lastname: Aguilar
authors.affiliation: Lab. Ing. Química Ambiental, ESIQIE-Instituto Politécnico Nacional, Zacatenco, 07738, México, D.F., México. ozliliana@yahoo.com.mx.
authors.forename: Julia L
authors.initials: JL
authors.lastname: Rodríguez
authors.affiliation: Departamento de Bioprocesos, UPIBI-Instituto Politécnico Nacional, Ticoman, 07340, México, D.F., México.
authors.forename: Isaac
authors.initials: I
authors.lastname: Chairez
authors.affiliation: Universidad Nacional Autónoma de México, Centro de Nanociencias y Nanotecnología, Km. 107 Carretera Tijuana a Ensenada, 22860, Ensenada, Baja California, México.
authors.forename: Hugo
authors.initials: H
authors.lastname: Tiznado
authors.affiliation: Lab. Ing. Química Ambiental, ESIQIE-Instituto Politécnico Nacional, Zacatenco, 07738, México, D.F., México.
authors.forename: Tatyana
authors.initials: T
authors.lastname: Poznyak
mesh_terms: D002384:Catalysis; D000431:Ethanol / Q000737:chemistry*; D009281:Naphthalenes / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D009281:Naphthalenes; D012997:Solvents; D014874:Water Pollutants, Chemical; C031721:naphthalene; D000431:Ethanol; D010126:Ozone; D009532:Nickel; C028007:nickel monoxide
keywords: Catalytic ozonation; Cosolvent; Ethanol; Naphthalene; Nickel oxide; Ozonation
references.citation: J Environ Sci (China). 2012;24(6):1064-75
references.pmid: 23505874
references.citation: J Hazard Mater. 2013 Mar 15;248-249:150-8
references.pmid: 23353934
references.citation: J Hazard Mater. 2013 Nov 15;262:472-81
references.pmid: 24076483
references.citation: Water Res. 2001 Nov;35(16):3941-9
references.pmid: 12230177
references.citation: Chemosphere. 2006 Nov;65(8):1288-94
references.pmid: 16735053
references.citation: Appl Environ Microbiol. 2000 Feb;66(2):518-23
references.pmid: 10653712
references.citation: Free Radic Biol Med. 1998 Jul 15;25(2):137-43
references.pmid: 9667488
references.citation: Res Commun Mol Pathol Pharmacol. 1998 Sep;101(3):249-57
references.pmid: 9874283
references.citation: N Biotechnol. 2015 Jan 25;32(1):147-56
references.pmid: 24462777
references.citation: Bull Environ Contam Toxicol. 1999 Jul;63(1):101-8
references.pmid: 10423490
references.citation: Environ Sci Pollut Res Int. 2014 Nov;21(21):12241-8
references.pmid: 24946707
references.citation: J Hazard Mater. 2009 Sep 15;168(2-3):1192-9
references.pmid: 19361920
references.citation: Chemosphere. 2012 Jun;87(10):1186-91
references.pmid: 22365276
references.citation: Sci Total Environ. 2014 Apr 15;478:201-25
references.pmid: 24552655
references.citation: Toxicology. 2002 Oct 30;180(1):97-105
references.pmid: 12324202
references.citation: Environ Sci Technol. 1985 Dec 1;19(12):1206-13
references.pmid: 22280139