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Visible‐Light‐Assisted Photocatalytic Degradation of Phenolic Compounds Using Bi 2 S 3 /Bi 2 W 2 O 9 Heterostructure Materials as Photocatalyst
Author(s) -
Bhoi Yagna P.,
Majhi Dibyananda,
Das Krishnendu,
Mishra Braja G.
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201900450
Subject(s) - photocatalysis , x ray photoelectron spectroscopy , materials science , heterojunction , tungstate , photoluminescence , bismuth , diffuse reflectance infrared fourier transform , visible spectrum , analytical chemistry (journal) , nuclear chemistry , chemical engineering , chemistry , organic chemistry , optoelectronics , engineering , metallurgy , catalysis
In this work, bismuth sulphide (Bi 2 S 3 )/bismuth tungstate (Bi 2 W 2 O 9 ) heterostructure materials were prepared and studied as photocatalyst for decomposition of phenolic compounds under visible light. The Bi 2 S 3 nanomaterial was deposited over the combustion synthesized Bi 2 W 2 O 9 material using a hydrothermal procedure. The heterostructures were characterized using X‐ray diffraction (XRD), photoluminescence (PL), photoelectron spectroscopy (XPS), ultraviolet‐visible diffuse reflectance spectroscopy (UV‐Vis‐DRS), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) techniques. The presence of crystalline orthorhombic Bi 2 S 3 and Bi 2 W 2 O 9 phases was confirmed from XRD analysis. Morphologically, the heterostructure materials contained Bi 2 S 3 nano‐rods grown uniformly over Bi 2 W 2 O 9 micron size plates. The heterostructure materials displayed improved absorption features in visible region and enhanced separation of excitons. The Bi 2 S 3 /Bi 2 W 2 O 9 materials displayed excellent photocatalytic activity towards the degradation of phenolic compounds from aqueous sources. Structurally diverse phenol moieties could be mineralized effectively with high efficiency (> 80%) within 2 h. The hydroxyl and superoxide radicals were identified as reactive species for phenol degradation, the formation of which was confirmed from spectroscopic analysis. The mechanism of photocatalytic degradation of phenol over the Bi 2 S 3 /Bi 2 W 2 O 9 photocatalyst surface was also described.