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Synthesis, Characterization, and Photocatalytic Application of Type‐II CdS/Bi 2 W 2 O 9 Heterojunction Nanomaterials towards Aerobic Oxidation of Amines to Imines
Author(s) -
Bhoi Yagna Prakash,
Mishra Braja G.
Publication year - 2018
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201800221
Subject(s) - heterojunction , high resolution transmission electron microscopy , x ray photoelectron spectroscopy , photocatalysis , chemistry , orthorhombic crystal system , nanomaterials , nanoparticle , hydrothermal synthesis , photoluminescence , chemical engineering , hydrothermal circulation , photochemistry , nanotechnology , materials science , crystal structure , crystallography , transmission electron microscopy , organic chemistry , optoelectronics , catalysis , engineering
A series of new type‐II CdS/Bi 2 W 2 O 9 heterojunction nanomaterials is prepared by a two stage process. Initially, phase‐pure Bi 2 W 2 O 9 , with orthorhombic crystalline structure, is prepared by a facile combustion‐synthesis route. The combustion‐synthesized Bi 2 W 2 O 9 is subsequently modified by CdS nanoparticles using a hydrothermal route. The CdS/Bi 2 W 2 O 9 heterojunctions are characterized using XRD, XPS, FTIR spectroscopy, UV/Vis DRS, PL, and FESEM and HRTEM studies. The occurrence of ultrafine CdS nanoparticles, with diameters of 8–15 nm, well‐dispersed over BWO plates, is inferred from microscopic characterization studies. The two crystalline phases exhibit microscopic close contact across grain boundaries, facilitating the transfer of excitons. The heterojunction materials exhibit improved visible‐light absorption, enhanced charge‐carrier separation, and suitable band‐alignment characteristics of a type‐II heterojunction. The CdS/Bi 2 W 2 O 9 heterojunctions are evaluated as visible‐light‐active photocatalysts for the aerobic oxidation of amines to imines. Structurally and functionally diverse amine molecules are oxidized to the corresponding imines, with excellent selectivity, in a short span of time.