Nickel formate induced high-level in situ Ni-doping of g-C3N4 for a tunable band structure and enhanced photocatalytic performance

2019 ◽  
Vol 7 (39) ◽  
pp. 22385-22397 ◽  
Author(s):  
Peiqin Deng ◽  
Jinsong Xiong ◽  
Shuijin Lei ◽  
Wei Wang ◽  
Xiuling Ou ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Band Structure ◽  
Photocatalytic Performance ◽  
Dye Degradation ◽  
Ni Doping ◽  
Nickel Formate ◽  
High Level ◽  
First Time

Nickel formate is used for the first time for high-level in situ Ni-doping of g-C3N4 for enhanced photocatalytic activity in both dye-degradation and H2-evolution.

scholarly journals Enhanced Visible-Light Photocatalytic Performance of SAPO-5-Based g-C3N4 Composite for Rhodamine B (RhB) Degradation

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3948
Author(s):  
Lingfang Qiu ◽  
Zhiwei Zhou ◽  
Mengfan Ma ◽  
Ping Li ◽  
Jinyong Lu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Redox Reactions ◽  
Photocatalytic Performance ◽  
Dye Degradation ◽  
Thermal Polymerization ◽  
Light Illumination ◽  
Electron Hole ◽  
Visible Light Illumination ◽  
Visible Light Photocatalytic

Novel visible-light responded aluminosilicophosphate-5 (SAPO-5)/g-C3N4 composite has been easily constructed by thermal polymerization for the mixture of SAPO-5, NH4Cl, and dicyandiamide. The photocatalytic activity of SAPO-5/g-C3N4 is evaluated by degrading RhB (30 mg/L) under visible light illumination (λ > 420 nm). The effects of SAPO-5 incorporation proportion and initial RhB concentration on the photocatalytic performance have been discussed in detail. The optimized SAPO-5/g-C3N4 composite shows promising degradation efficiency which is 40.6% higher than that of pure g-C3N4. The degradation rate improves from 0.007 min−1 to 0.022 min−1, which is a comparable photocatalytic performance compared with other g-C3N4-based heterojunctions for dye degradation. The migration of photo-induced electrons from g-C3N4 to the Al site of SAPO-5 should promote the photo-induced electron-hole pairs separation rate of g-C3N4 efficiently. Furthermore, the redox reactions for RhB degradation occur on the photo-induced holes in the g-C3N4 and Al sites in SAPO-5, respectively. This achievement not only improves the photocatalytic activity of g-C3N4 efficiently, but also broadens the application of SAPOs in the photocatalytic field.

Enhanced photocatalytic performance of BiOBr/NH2-MIL-125(Ti) composite for dye degradation under visible light

2016 ◽  
Vol 45 (43) ◽  
pp. 17521-17529 ◽  
Author(s):  
Shuai-Ru Zhu ◽  
Peng-Fei Liu ◽  
Meng-Ke Wu ◽  
Wen-Na Zhao ◽  
Guo-Chang Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Performance ◽  
Dye Degradation ◽  
Composite Photocatalysts

BiOBr/NH2-MIL-125(Ti) composite photocatalysts have been prepared by incorporating NH2-MIL-125(Ti) with BiOBr and exhibited improved photocatalytic activity under visible light compared to pristine BiOBr and NH2-MIL-125(Ti).

scholarly journals In Situ Construction of a MgSn(OH)6 Perovskite/SnO2 Type-II Heterojunction: A Highly Efficient Photocatalyst towards Photodegradation of Tetracycline

Nanomaterials ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 53 ◽  
Author(s):  
Yuanyuan Li ◽  
Xiaofang Tian ◽  
Yaoqiong Wang ◽  
Qimei Yang ◽  
Yue Diao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Ultraviolet Irradiation ◽  
Photocatalytic Oxidation ◽  
Photocatalytic Performance ◽  
Diffuse Reflectance Spectroscopy ◽  
Active Species ◽  
Growth Strategy ◽  
Type Ii ◽  
Highly Efficient

Using solar energy to remove antibiotics from aqueous environments via photocatalysis is highly desirable. In this work, a novel type-II heterojunction photocatalyst, MgSn(OH)6/SnO2, was successfully prepared via a facile one-pot in situ hydrothermal method at 220 °C for 24 h. The obtained heterojunctions were characterized via powder X-ray diffraction, Fourier-transform infrared spectroscopy, transmission electron microscopy, and ultraviolet-visible diffuse reflectance spectroscopy. The photocatalytic performance was evaluated for photodegradation of tetracycline solution under ultraviolet irradiation. The initial concentration of tetracycline solution was set to be 20 mg/L. The prepared heterojunctions exhibited superior photocatalytic activity compared with the parent MgSn(OH)6 and SnO2 compounds. Among them, the obtained MgSn(OH)6/SnO2 heterojunction with MgCl2·6H2O:SnCl4·5H2O = 4:5.2 (mmol) displayed the highest photocatalytic performance and the photodegradation efficiency conversion of 91% could be reached after 60 min under ultraviolet irradiation. The prepared heterojunction maintained its performance after four successive cycles of use. Active species trapping experiments demonstrated that holes were the dominant active species. Hydroxyl radicals and superoxide ions had minor effects on the photocatalytic oxidation of tetracycline. Photoelectrochemical measurements were used to investigate the photocatalytic mechanism. The enhancement of photocatalytic activity could be assigned to the formation of a type-II junction photocatalytic system, which was beneficial for efficient transfer and separation of photogenerated electrons and holes. This research provides an in situ growth strategy for the design of highly efficient photocatalysts for environmental restoration.

scholarly journals In situ structural modification of graphitic carbon nitride by alkali halides and influence on photocatalytic activity

RSC Advances ◽  
2017 ◽  
Vol 7 (52) ◽  
pp. 32592-32600 ◽  
Author(s):  
Yan Xu ◽  
Yinyan Gong ◽  
Hui Ren ◽  
Wenbo Liu ◽  
Lengyuan Niu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Charge Carrier ◽  
Basal Plane ◽  
Carbon Nitride ◽  
Structural Modification ◽  
Photocatalytic Performance ◽  
Alkali Halides ◽  
Thermal Condensation ◽  
Carrier Transfer

Introducing alkali halides during thermal condensation of melamine disturbs periodic ordering in the basal plane, reduces the band gap, and facilitates charge carrier transfer and separation, and thus enhances the photocatalytic performance of g-C3N4.

scholarly journals Enhanced Photocatalytic Activity of Electrospun β-Ga2O3 Nanofibers via In-Situ Si Doping Using Tetraethyl Orthosilicate

Catalysts ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1005 ◽  
Author(s):  
Tae Hee Yoo ◽  
Heejoong Ryou ◽  
In Gyu Lee ◽  
Byung Jin Cho ◽  
Wan Sik Hwang
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Performance ◽  
Oxidation Potential ◽  
Si Doping ◽  
Defect Sites ◽  
Electrospinning Method ◽  
Ultraviolet C ◽  
Si Doped ◽  
High Reduction

β-Ga2O3 has attracted considerable attention as an alternative photocatalyst to replace conventional TiO2 under ultraviolet-C irradiation due to its high reduction and oxidation potential. In this study, to enhance the photocatalytic activity of β-Ga2O3, nanofibers are formed via the electrospinning method, and Si atoms are subsequently doped. As the Si concentration in the β-Ga2O3 nanofiber increases, the optical bandgap of the β-Ga2O3 nanofibers continuously decreases from 4.5 eV (intrinsic) to 4.0 eV for the Si-doped (2.4 at. %) β-Ga2O3 nanofibers, and accordingly, the photocatalytic activity of the β-Ga2O3 nanofibers is enhanced. This higher photocatalytic performance with Si doping is attributed to the increased doping-induced carriers in the conduction band edges. This differs from the traditional mechanism in which the doping-induced defect sites in the bandgap enhance separation and inhibit the recombination of photon-generated carriers.

Carbon-doped titania nanoplates with exposed {001} facets: facile synthesis, characterization and visible-light photocatalytic performance

RSC Advances ◽  
2015 ◽  
Vol 5 (23) ◽  
pp. 17667-17675 ◽  
Author(s):  
Jian-Wen Shi ◽  
Chang Liu ◽  
Chi He ◽  
Jun Li ◽  
Chong Xie ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Performance ◽  
Facile Synthesis ◽  
Carbon Doped ◽  
Visible Light Photocatalytic Activity ◽  
Doped Titania ◽  
First Time ◽  
Visible Light Photocatalytic

C-doped TiO2 nanoplates (CTNP) with exposed {001} facets were synthesized for the first time. The obtained CTNP presented high visible-light photocatalytic activity. A reasonable mechanism of photocatalysis on CTNP under visible light was proposed.

Photocatalytic performance of Pd decorated TiO2–CdO composite: Role of in situ formed CdS in the photocatalytic activity

2015 ◽  
Vol 40 (39) ◽  
pp. 13431-13442 ◽  
Author(s):  
Sanjay B. Kokane ◽  
S.D. Sartale ◽  
K.G. Girija ◽  
Jagannath ◽  
R. Sasikala
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Performance

scholarly journals Photocatalytic Adsorption Synergistic Degradation of Tetracycline by Z-scheme Bi2WO6/ZIF-8

2021 ◽  
Author(s):  
Xiaojun Dai ◽  
sheng feng ◽  
Wei Wu ◽  
Yun Zhou ◽  
Zhiwei Ye ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Photogenerated Electron ◽  
Utilization Efficiency ◽  
Electron Hole ◽  
Effects Of Ph ◽  
Growth Method ◽  
Synergistic Degradation ◽  
First Time

Abstract In this paper, in order to improved the photocatalytic activity of Bi2WO6, Bi2WO6 and ZIF-8 were successfully combined by in-situ growth method for the first time. The addition of ZIF-8 effectively inhibited the recombination of photogenerated electron hole pairs and further improved the electron utilization efficiency, and superoxide anion was introduced to greatly improve the photocatalytic activity. The performance of Bi2WO6/ZIF-8 in the photodegradation of tetracycline (TC) was studied under different conditions of proportions of ZIF-8, dosage of catalyst and concentration of TC. The results indicated that B/Z/5/1 (10mg) had the best photocatalytic activity, and 97.8% of TC (20mg/L) could be degraded in 80 minutes under UV light, the rate constant (k) for TC degradation was almost 3 times that of Bi2WO6. The effects of pH, HA and inorganic anions on the degradation of TC were studied in simulated real water. Further, B/Z/5/1 could be reutilized up to five cycles without reduction of efficiency and catalysis performance. Therefore, Bi2WO6/ZIF-8 heterojunction composite material can be utilized as an efficient photocatalyst for remediation of environmental pollution.

scholarly journals Heterostructures “Ferroelectric Film/Silicon Carbide” for High Power Microwave Applications

Coatings ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 247
Author(s):  
Andrey Tumarkin ◽  
Alexander Gagarin ◽  
Michail Zlygostov ◽  
Evgeny Sapego ◽  
Andrey Altynnikov
Keyword(s):  
Silicon Carbide ◽  
Layer Structure ◽  
Ferroelectric Film ◽  
Heat Conducting ◽  
High Power Microwave ◽  
High Tunability ◽  
High Level ◽  
First Time ◽  
Power Microwave

The ferroelectric barium–strontium titanate (BST) multi-layer structure has been formed directly on silicon carbide by serial deposition and “in situ” annealing of layers. This approach allowed us to achieve the high-quality perovskite lattice of ferroelectric that provides the best combination of high tunability and low losses for BST/SiC structures at microwaves. Electric characteristics of BST/SiC planar capacitor structures were studied under the high level of microwave power for the first time. The BST/SiC structure consisted of highly oriented ferroelectric film on highly heat-conducting substrate have demonstrated the absence of the overheating of the active area of the capacitor under dissipated power density up to 125 W/mm 2 .

In situ bubble template promoted facile preparation of porous g-C3N4 with excellent visible-light photocatalytic performance

RSC Advances ◽  
2015 ◽  
Vol 5 (78) ◽  
pp. 63264-63270 ◽  
Author(s):  
Lei Shi ◽  
Lin Liang ◽  
Fangxiao Wang ◽  
Mengshuai Liu ◽  
Tao Liang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Recombination Rate ◽  
Photocatalytic Performance ◽  
Electron Hole ◽  
Facile Preparation ◽  
Bubble Template ◽  
Splitting Water ◽  
Visible Light Photocatalytic

pg-C3N4 prepared through in situ bubble template showed large surface area and low recombination rate of photoinduced electron–hole pairs, leading to enhanced visible-light photocatalytic activity for degrading pollutants and splitting water to H2.

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