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Optimizing photo-mineralization of aqueous methyl orange by nano-ZnO catalyst under simulated natural conditions.

hal.structure.identifierCollege of Sciences
dc.contributor.authorZYOUD, Ahed H.
dc.contributor.authorZU'BI, Amani
hal.structure.identifierDepartment of Chemistry
dc.contributor.authorHELAL, Muath H.
hal.structure.identifierBroad Institute of MIT and Harvard [BROAD INSTITUTE]
dc.contributor.authorPARK, Daehoon
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCAMPET, Guy
dc.date.issued2015
dc.identifier.issn2052-336X
dc.description.abstractEnPhoto-degradation of organic contaminants into non-hazardous mineral compounds is emerging as a strategy to purify water and environment. Tremendous research is being done using direct solar light for these purposes. In this paper we report on optimum conditions for complete mineralization of aqueous methyl orange using lab-prepared ZnO nanopowder catalyst under simulated solar light. Nano-scale ZnO powder was prepared in the lab by standard methods, and then characterized using electronic absorption spectra, photolumenscence emission (PL) spectra, XRD, and SEM. The powder involved a wurtzite structure with ~19 nm particles living in agglomerates. Photo-degradation progressed faster under neutral or slightly acidic conditions which resemble natural waters. Increasing catalyst concentration increased photodegradation rate to a certain limit. Values of catalyst turn over number and degradation percentage increased under higher light intensity, whereas the quantum yield values decreased. The photocatalytic efficiency of nano-ZnO powders in methyl orange photodegradation in water with solar light has been affected by changing the working conditions. More importantly, the process may be used under natural water conditions with pH normally less than 7, with no need to use high concentrations of catalyst or contaminant. The results also highlight the negative impact of possible high concentrations of CO2 on water purification processes. Effects of other added gaseous flows to the reaction mixture are also discussed. ZnO nano-particles are useful catalyst for complete mineralization of organic contaminants in water. Photo-degradation of organic contaminants with ZnO nano-particles, methyl orange being an example, should be considered for future large scale water purification processes under natural conditions.
dc.language.isoen
dc.subject.enContaminant mineralization
dc.subject.enMethyl orange
dc.subject.enSolar simulated light
dc.subject.enZnO nanopowder
dc.title.enOptimizing photo-mineralization of aqueous methyl orange by nano-ZnO catalyst under simulated natural conditions.
dc.typeArticle de revue
dc.identifier.doi10.1186/s40201-015-0204-0
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of environmental health science & engineering
bordeaux.page46 (10 p.)
bordeaux.volume13
bordeaux.peerReviewedoui
hal.identifierhal-01160248
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01160248v1
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