Study of methylene blue removal and photocatalytic degradation on zirconia thin films modified with Mn-Anderson polyoxometalates

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dc.catalogadordfo
dc.contributor.authorFlorez, Jiress
dc.contributor.authorDíaz Uribe, Carlos
dc.contributor.authorVallejo, William
dc.contributor.authorDuran, Freider
dc.contributor.authorPuello, Esneyder
dc.contributor.authorSalazar Canas, Javier Antoni
dc.contributor.authorZarate, Ximena
dc.contributor.authorSchott Verdugo, Eduardo Enrique
dc.date.accessioned2025-03-19T13:39:41Z
dc.date.available2025-03-19T13:39:41Z
dc.date.issued2024
dc.description.abstractRecalcitrant pollutants are challenging to degrade during water treatment processes. Methylene blue (MB), a cationic dye, is particularly resistant to degradation and is environmentally persistent. Heterogeneous photocatalysis has emerged as a suitable strategy for removing such pollutants from water. In this work, ZrO2 thin films were modified with Anderson-type Mn-polyoxometalate (MnPOM) ((NH4)3[MnMo6O24H6]), and the efficiency of MB removal from water was studied. ZrO2 was synthesized by a sol-gel method, with thin films deposited using the doctor blade method, and ZrO2 thin films were modified using chemisorption method. The synthesized materials were characterized using SEM, EDX, UV-Vis diffuse reflectance spectroscopy and FTIR. The adsorption kinetics and isotherms for MB were studied for both bare ZrO2 and ZrO2/MnPOM composites. Optical characterization showed a band gap energy of 4.02 eV for bare ZrO2, while the ZrO2/MnPOM composite exhibited a band gap of 3.7 eV. Furthermore, ZrO2 showed lower MB removal capacity (similar to 8%) than ZrO2/MnPOM thin films (similar to 29%). The isothermal adsorption studies indicated that MB adsorption onto both bare ZrO2 and ZrO2/MnPOM followed the Langmuir adsorption model (qm = 20.6 mg g-1 for ZrO2 and qm = 62.9 mg g-1 for ZrO2/MnPOM). Furthermore, the adsorption kinetics of MB were well described by a pseudo-second-order model. Photocatalytic testing under UV irradiation showed an apparent rate constant (kap) of 2 x 10-3 min-1 for bare ZrO2 and a value of kap 5.4 x 10-3 min-1 for ZrO2/MnPOM after 100 minutes. TD-DFT calculations revealed an LMCT interaction between the ZrO2 nanoparticle and the MnPOM, which likely contributes to the enhanced photocatalytic activity of the ZrO2/MnPOM composite.
dc.fuente.origenWOS
dc.identifier.doi10.1039/d4dt02782e
dc.identifier.eissn1477-9234
dc.identifier.issn1477-9226
dc.identifier.urihttps://doi.org/10.1039/d4dt02782e
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/102796
dc.identifier.wosidWOS:001388587500001
dc.information.autorucEscuela de Química; Salazar Canas Javier Antoni; S/I; 96543
dc.information.autorucEscuela de Química; Schott Verdugo Eduardo Enrique; 0000-0002-2546-304X; 1020229
dc.language.isoen
dc.nota.accesoContenido completo
dc.revistaDalton Transactions
dc.rightsacceso abierto
dc.rights.licenseAtribución-NoComercial 3.0 No portada
dc.rights.urihttps://creativecommons.org/licenses/by-nc/3.0/deed.es
dc.subject.ddc510
dc.subject.deweyMatemática física y químicaes_ES
dc.titleStudy of methylene blue removal and photocatalytic degradation on zirconia thin films modified with Mn-Anderson polyoxometalates
dc.typepreprint
sipa.codpersvinculados96543
sipa.codpersvinculados1020229
sipa.trazabilidadWOS;2025-01-11
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