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A study of heating rate effect on the photocatalytic performances of ZnO powders prepared by sol-gel route: Their kinetic and thermodynamic studies

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dc.contributor.authorTÜNÇAY, MEHMET MASUM
dc.contributor.authorsDemirci, Selim; Dikici, Tuncay; Tuncay, Mehmet Masum; Kaya, Nusret
dc.date.accessioned2022-03-14T09:19:53Z
dc.date.available2022-03-14T09:19:53Z
dc.date.issued2020-03
dc.description.abstractIn this work, ZnO particles were fabricated by sol-gel method at different heating rate at 500 degrees C for 2 h. The ZnO powders were analysed by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), UV-vis spectroscopy and photoluminescence, respectively. The effect of heating rate on photocatalytic activities of ZnO particles was evaluated by degradation of methylene blue (MB). The non-isothermal kinetics and thermodynamic properties were also estimated. The XRD results showed that ZnO had hexagonal wurtzite structure. The different heating rate didn't influence the surface morphology of ZnO powders. It was observed that the heating rate had a profound effect on reduction of band gap and photocatalytic performances. The band gap of the ZnO particles varied from 3.10 to 3.17. The ZnO sample prepared at 1 degrees C/min exhibited the highest photocatalytic activity. Its relative photocatalytic degradation rate and kinetic constant were 92.7% and 1.069x10(-2) min(-1), respectively. The results might be ascribed to low bulk vacancies, high surface oxygen vacancies and narrow band gap energy. Also, ZnO photocatalysts showed good stability after four sequence tests. This study provides a new strategy to improve the photocatalytic performances of ZnO photocatalyst for the degradation of organic contaminant.
dc.identifier.doi10.1016/j.apsusc.2019.145083
dc.identifier.eissn1873-5584
dc.identifier.issn0169-4332
dc.identifier.urihttps://hdl.handle.net/11424/242973
dc.identifier.wosWOS:000520021200085
dc.language.isoeng
dc.publisherELSEVIER
dc.relation.ispartofAPPLIED SURFACE SCIENCE
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectSol-gel method
dc.subjectHeating rate
dc.subjectParticle
dc.subjectThermodynamic properties
dc.subjectPhotocatalytic activity
dc.subjectZINC-OXIDE NANOPARTICLES
dc.subjectMETHYLENE-BLUE
dc.subjectTHIN-FILMS
dc.subjectOPTICAL-PROPERTIES
dc.subjectCARBON NANOTUBES
dc.subjectAQUEOUS-SOLUTION
dc.subjectGREEN SYNTHESIS
dc.subjectDEGRADATION
dc.subjectPHOTOLUMINESCENCE
dc.subjectTEMPERATURE
dc.titleA study of heating rate effect on the photocatalytic performances of ZnO powders prepared by sol-gel route: Their kinetic and thermodynamic studies
dc.typearticle
dspace.entity.typePublication
local.avesis.id011777a2-756a-4b39-91c2-0168048e4d37
local.import.packageSS16
local.indexed.atWOS
local.indexed.atSCOPUS
local.journal.articlenumber145083
local.journal.numberofpages12
local.journal.quartileQ1
oaire.citation.titleAPPLIED SURFACE SCIENCE
oaire.citation.volume507
relation.isAuthorOfPublicationd29bd461-eb55-4b01-ba97-1773d6335aca
relation.isAuthorOfPublication.latestForDiscoveryd29bd461-eb55-4b01-ba97-1773d6335aca

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