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dc.contributor.authorWitchaya Phasayavanen_US
dc.contributor.authorMattawan Japaen_US
dc.contributor.authorSoraya Pornsuwanen_US
dc.contributor.authorDoldet Tantraviwaten_US
dc.contributor.authorFilip Kielaren_US
dc.contributor.authorVladimir B. Golovkoen_US
dc.contributor.authorSiriporn Jungsuttiwongen_US
dc.contributor.authorBurapat Inceesungvornen_US
dc.description.abstract© 2020 Elsevier Inc. Herein, bismuth molybdate (Bi2MoO6) nanocatalysts containing oxygen vacancies (OVs) are found to considerably promote the photocatalytic performance toward oxidative coupling of benzylamine to N-benzylidenebenzylamine under visible light irradiation. The structure-activity relationship for this interesting catalyst is revealed for the first time. The oxygen-deficient Bi2MoO6 nanoplatelets (BMO-NPs) are synthesized using ethylene glycol-ethanol solvent mixture as a reaction medium in solvothermal method. A comparison with hydrothermally prepared Bi2MoO6 square-like sheets (BMO-SHs) suggests that the nanoplatelets are much smaller in size and contain higher amount of OVs. Benzylamine conversion over the BMO-NPs is ca. 4.0 times higher than that over the BMO-SHs and ca. 3.8 and ca. 34.6 times higher than that over the commercial benchmark TiO2 P25 and BiVO4 catalysts, respectively. The BMO-NPs achieve more than 80% product yield within 2 h of irradiation regardless of substituents of benzylamine derivatives. The enhanced activity of BMO-NPs is due to synergistic roles of high surface-to-volume ratio and OVs, providing enlarged active area, extended light absorption range and improved charge separation and transfer efficiency as evidenced from UV–vis DRS, BET surface area, photocurrent response, electrochemical impedance spectroscopy, and time-resolved fluorescence decay measurements. EPR-trapping and radical scavenging experiments indicate O2[rad]− as a main active species rather than 1O2 and a plausible imine formation mechanism via O2[rad]−-assisted charge transfer is proposed accordingly. The work offers an alternative facile preparation method to design efficient semiconductor photocatalysts and for the first time reveals a possible benzylamine coupling mechanism over the oxygen-deficient Bi2MoO6 nanocatalyst.en_US
dc.subjectChemical Engineeringen_US
dc.subjectMaterials Scienceen_US
dc.titleOxygen-deficient bismuth molybdate nanocatalysts: Synergistic effects in boosting photocatalytic oxidative coupling of benzylamine and mechanistic insighten_US
article.title.sourcetitleJournal of Colloid and Interface Scienceen_US
article.volume581en_US Ratchathani Universityen_US Universityen_US of Canterburyen_US Universityen_US Mai Universityen_US
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