Journal
MATERIALS TODAY COMMUNICATIONS
Volume 26, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtcomm.2021.102117
Keywords
Semiconductors; Chemical synthesis; Transmission electron microscopy; Catalytic properties; Defects
Categories
Funding
- CSIR [02(0332) /18/EMR-II]
- DST-SERB, Government of India [EMR/2016/006131]
- UGC, Government of India
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This study successfully fabricated a microspherical core-shell structure consisting of MoO2 and graphitic-C3N4 through a simple one-step calcination procedure. The core-shell exhibited high optical bandgap, facilitated dye degradation, and promoted organic synthesis.
In the current study, we fabricated a microspherical core-shell consisting of MoO2 and graphitic-C3N4 by a simple one-step calcination procedure. TEM analysis revealed MoO2 at the core (average diameter of 210 nm), surrounded by a graphitic-C3N4 shell. MoO2 of the core exhibited monoclinic symmetry. The Raman spectrum additionally confirmed the monoclinic MoO2. The sample was EPR active, indicating paramagnetic oxygen vacancies. It contained meso-sized pores and a high surface area. The core-shell's optical bandgap was higher than the pure metallic MoO2. XPS results confirmed the existence of molybdenum in IV and VI oxidation states. The core-shell's heterojunction catalyzed the degradation of xylenol orange (XO) dye into C8H9ONH3+, C6H5SO3- and C15H14ONH3+SO3-. The core-shell promoted the efficient synthesis of symmetrical and unsymmetrical 2, 4, 6-triaryl pyridines through the oxidative condensation of acetophenones with benzylamines in good to excellent yields using molecular oxygen as the oxidant. The catalyst is recyclable for both these reactions.
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