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3D Porous Bi 2‐x Gd x WO 6 /rGO Composite for Efficient Adsorption‐Enrichment and Photocatalytic Degradation of Organic Dyes
Author(s) -
Zhan Weiwu,
Wu Zhifeng,
Tang Yanren,
Ding Yu,
Ma Cheng,
Ding Xute,
Chen Dianyu
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202100014
Subject(s) - rhodamine b , photocatalysis , methyl orange , materials science , diffuse reflectance infrared fourier transform , x ray photoelectron spectroscopy , adsorption , scanning electron microscope , nuclear chemistry , visible spectrum , nanocomposite , photoluminescence , analytical chemistry (journal) , chemical engineering , nanotechnology , chemistry , catalysis , organic chemistry , composite material , optoelectronics , engineering
Bi 2‐x Gd x WO 6 /rGO was prepared by a two‐step process. Firstly, Bi 2−x Gd x WO 6 (BGWO‐x) nanomaterials were synthesized via a hydrothermal method, and then BGWO‐x was homogenously implanted as a filler into the rGO nanosheets to obtain a novel 3D porous composite. The physical‐chemical properties were investigated by X‐ray diffraction, UV‐vis diffuse reflectance spectroscopy, scanning electron microscopy, transmission electron microscopy, energy dispersive spectrometry, photoluminescence spectroscopy, X‐ray photoelectron spectroscopy and N 2 adsorption‐desorption isotherm analysis. The photocatalytic activity of samples was envaulted by degrading three organic dyes (rhodamine B (Rh B), methyl orange (MO), and methylene blue (MB)) under visible‐light irradiation (300 W mercury lamp). Doping of Gd 3+ ions could reduce the bandgap of Bi 2 WO 6 , thus improving its light absorption range. The BGWO‐0.25 with the best photocatalytic performance was selected to construct the BGWO‐0.25/rGO (BGWO/G) nanocomposite, which exhibited the excellent synergistic effect of adsorption‐enrichment and photocatalytic degradation. The removal rates of Rh B, MB, and MO by BGWO/G were about 1.96, 2.94, 2.82 times as that of the pure Bi 2 WO 6 . And the proposed mechanism of photocatalytic degradation was deduced, in which the photo‐generated O 2 .− and h + (active species on the surface of BGWO/G) played the roles of active species during the reaction.