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Fabrication of Ternary Structure Photocatalyst CdS/CQD@mpg‐C 3 N 4 with Enhanced Photocatytic Performance Based on Synergistic Effect
Author(s) -
Zhao Qian,
Yang Cheng,
Zhao Haibo,
Gao Guofang,
Jiang Tingshun
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802610
Subject(s) - high resolution transmission electron microscopy , materials science , x ray photoelectron spectroscopy , photocatalysis , cadmium sulfide , graphitic carbon nitride , quantum dot , photoluminescence , ternary operation , carbon nitride , transmission electron microscopy , fourier transform infrared spectroscopy , methyl orange , chemical engineering , analytical chemistry (journal) , nanotechnology , catalysis , optoelectronics , chemistry , organic chemistry , computer science , engineering , metallurgy , programming language
Ternary heterostructure composites are promising photocatalysts for degrading organic pollutants in water. In this study, a series of mesoporous carbon nitride (mpg‐C 3 N 4 ) decorated with different amounts of carbon quantum dots (CQDs) and cadmium sulfide quantum dots (CdSQDs) were synthesized with a few simple and feasible steps. Under visible‐light irradiation, the optimal catalyst resulted in a more than 6.16 times faster reaction rate for methyl orange (MO) photodecomposition than pure mpg‐C 3 N 4 and 3.1 times faster than pure cadmium sulfide. The carbon dots and cadmium sulfide quantum dots could be observed on the layers of carbon nitride pore walls through transmission electron microscopy (TEM) and high‐resolution transmission electron microscopy (HRTEM). The physicochemical properties of selected samples were characterized by X‐ray diffraction (XRD), Fourier transform infrared (FT‐IR), X‐ray photoelectron spectroscopy (XPS), Brunauer‐Emmett‐Teller (BET), UV‐vis diffuse reflection spectroscopy (DRS), the photoluminescence (PL) and the photocurrent (PC). Probable mechanism of enhanced visible‐light photocatalytic activity was investigated. The properties of combined ternary composites, such as high specific surface area of mpg‐C 3 N 4, good visible‐light harvest ability of CdSQDs and excellent electron storage capacity of CQDs, cooperatively contributed to the final enhancement.