INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Dongya Li,Jie Zan,Liping Wu,Shiyu Zuo,Haiming Xu,Dongsheng Xia
The g-C3N4–Cu2O (CNCu2O-G) with a p-n heterojunction structure in the presence of glutamate was successfully developed through hydrothermal synthesis and high-temperature calcination. When addition the glutamate, the surface morphology of the heterojunction was regulated, and its specific surface area increased by a factor of approximately 1.5, and reaction sites were increased. Additionally, the charge recombination rate of the heterojunction was reduced, and the absorption band was red-shifted to 460 nm, leading to stronger heterostructure contact interfaces, thus the visible-light utilization efficiency was enhanced. The catalytic performance of the CNCu2O-G was very stable, with no significant change in the photocatalytic efficiency of CNCu2O-G after six recycles, the Fourier transform infrared patterns and X-ray diffraction of CNCu2O-G exhibited no significant changes after the photocatalytic reaction. Furthermore, electron paramagnetic resonance and free-radical removal experiments indicated that the holes and superoxide radicals were dominant species during the reaction.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Dongya Li,Shiyu Zuo,Haiming Xu,Jie Zan,Lei Sun,Donghui Han,Wei Liao,Binyang Zhang,Dongsheng Xia
A g-C 3 N 4 -Cu 2 O was successfully synthesized in the presence of PEG-400 surfactant via a hydrothermal method and high-temperature calcination method. Based on the results of TEM , XPS , EPR , and other techniques, it was verified that a heterojunction was formed. The synthesized g-C 3 N 4 -Cu 2 O show excellent photocatalytic activity and stability was confirmed through cycling experiments, XRD and XPS. At a suitable addition amount, the value of band gap of g-C 3 N 4 -Cu 2 O is reduced to 1.87 eV, the PL intensity decreases effectively, the specific surface area is increased to 12.8114 m 2 /g, and the photocatalytic degradation rate is increased to 94%. Adding the surfactant PEG-400 in the precursor solutions leads to a reduction in the crystallite size, which can improve the morphology and specific surface area to form abundant heterojunction interfaces as channels for photo-generated carrier separation, and improve its light utilization and quantum efficiency.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Shiyu Zuo,Haiming Xu,Wei Liao,Xiangjuan Yuan,Lei Sun,Qiang Li,Jie Zan,Dongya Li,Dongsheng Xia
A novel heterojunction composite photocatalyst, g-C 3 N 4 -Cu 2 O, was fabricated via a high-temperature solid-phase molten salt method, hydrothermal method, and high-temperature calcination method. The structures and properties of as-synthesized samples were characterized using a range of techniques, such as X-ray photoelectron spectroscopy, scanning electron microscopy, UV–vis diffuse reflectance spectra and the Brunauer Emmet Teller (BET) theory. Their photocatalytic activity was evaluated based on the degradation of methyl orange (MO) under visible light irradiation. Based on the results obtained via TEM, XPS, EPR, and the other techniques, we verified that a heterojunction had formed. The g-C 3 N 4 -Cu 2 O heterojunction had the largest specific surface area, which provided plentiful activated sites for photocatalytic reaction. Moreover, g-C 3 N 4 -Cu 2 O showed the highest photocurrent effect and the minimum charge-transfer resistance. Furthermore, the g-C 3 N 4 -Cu 2 O heterojunction exhibited the highest MO photodegradation rate. After a series of radical trapping experiments and EPR analysis, we demonstrated that the holes and O 2 − radicals could be the main active species involved in MO photodegradation. The molten-salt process can improve the BET surface area to form abundant heterojunction interfaces, which serve as channels for photogenerated carrier separation and thereby enhance its light utilization and quantum efficiency.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 9
·e4448
·
IF 3.581
Shiyu Zuo,Haiming Xu,Wei Liao,Lei Sun,Donghui Han,Jie Zan,Binyang Zhang,Dongya Li,Dongsheng Xia
Acid-treated g-C 3 N 4 -Cu 2 O was prepared by hydrothermal reduction followed by high temperature calcination and acid exfoliation. The structures and properties of as-synthesized samples were characterized using a range of techniques, such as X-ray photoelectron spectroscopy, scanning electron microscopy, Photoluminescence Spectroscopy and the Brunauer–Emmett–Teller (BET) theory. The photocatalytic activity was evaluated by measuring the photodegradation of methyl orange under visible-light irradiation. Based on the results of TEM, XPS, EPR and other techniques, it was verified that a heterojunction was formed. The acid treatment process can increase the specific surface area to form abundant heterojunction interfaces as channels for photo-generated carrier separation, thereby enhancing its light utilization and quantum efficiency. Results indicate that acid-treated g-C 3 N 4 -Cu 2 O possesses a large specific surface area, which provides plentiful activated sites for heterojunctions to form; in addition, it showed a high visible light effect and the minimum charge-transfer resistance. Furthermore, the g-C 3 N 4 -Cu 2 O material exhibits high levels of effectiveness and stability. Electron paramagnetic resonance and a series of radical trapping experiments demonstrate that the holes and •O 2 − could be the main active species in methyl orange photodegradation. This work could provide new insights into the fabrication of composite materials as high-performance photocatalysts, and facilitate their application in addressing environmental protection issues.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 1
·015524
·
IF 1.929
Ying Si,Xiaoxian Zhang,Tingting Liang,Xun Xu,Lingfang Qiu,Ping Li,Shuwang Duo
Constructing heterojunction is a promising method to enhance visible-light utility and promote photogenerated e−-h+ pairs separation of g-C3N4. Herein, the present work reported a g-C3N4/Cu2O heterojunction by a facile in situ synthetic strategy. The structure, morphology, optical, electrochemical and photocatalytic properties were investigated. The results showed the combination of g-C3N4 nanosheets and Cu2O nanospheres resulted in the close contact interface and wide visible-light response range, and fast separation of the photo-generated e−-h+ pairs. The pristine g-C3N4 showed weak photocatalytic performance towards methyl orange (MO) under visible-light irradiation, compared with pristine g-C3N4, the photocatalytic degradation rate of optimized g-C3N4/Cu2O composite demonstrates the substantially enhanced photocatalytic activity, which showed no obvious loss after five repeated use. The enhanced performance was ascribed to the synergistic effect of good visible-light harvesting and enhanced separation rate of the charge carriers.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）