Magnetic Co0.5Zn0.5Fe2O4nanoparticle-modified polymeric g-C3N4sheets with enhanced photocatalytic performance for chloromycetin degradation

RSC Advances ◽  
2016 ◽  
Vol 6 (54) ◽  
pp. 48875-48883 ◽  
Author(s):  
Wei Ma ◽  
Long Chen ◽  
Jiangdong Dai ◽  
Chunxiang Li ◽  
Yongsheng Yan
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Hydrothermal Route ◽  
First Time

The visible-light and heterojunctional photocatalyst Co0.5Zn0.5Fe2O4/g-C3N4(CN-CZF) was prepared for the first time in a hydrothermal route by adopting Co0.5Zn0.5Fe2O4and g-C3N4as monomer.

scholarly journals Enhanced Photodecomposition of Methylene Blue in Water with Sr1−xKxTiO3−δ@PC-polyHIPEs under UV and Visible Light

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Yonghua Gao ◽  
Tao Zhang ◽  
Qipeng Guo ◽  
Lizhen Gao
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Uv Light ◽  
Water Solution ◽  
Internal Phase ◽  
Water Pollutant ◽  
First Time

Photocatalytic method was investigated to remove water pollutant methylene blue (MB) produced in textile, plastic, and dye industries. PC-polyHIPEs were prepared by light-induced polymerization of dopamine in transparent polyHIPEs which were synthesized by polymerization within high internal phase emulsions. Sr1-xKxTiO3-δ (x = 0–0.5) nanoparticles were incorporated and adhered to PC-polyHIPEs to form Sr1-xKxTiO3-δ@PC-polyHIPEs for the first time. The catalysts were characterized by XRD, FTIR, TGA, UV-Vis DRS, and SEM and their photocatalytic properties for MB decomposition were measured over UV-Vis spectrometer. The PC-polyHIPEs were of interconnected porous structure with around 100 μm pores and 30 μm windows. Sr1−xKxTiO3−δ@PC-polyHIPEs showed excellent MB decomposition activity under either UV or visible light although Sr1−xKxTiO3−δ alone worked only under UV light. When x = 0.3, Sr1−xKxTiO3−δ@PC-polyHIPEs showed the highest photocatalytic performance due to the existence of more oxygen vacancies. When the water solution with 50 mg L−1 MB and 1.6 gcat. L−1 Sr0.7K0.3TiO3−δ@PC-polyHIPEs was exposed to visible light for 160 min at room temperature, 88.3% of MB was decomposed. After being used for eight cycles, 87.6% activity of fresh Sr0.7K0.3TiO3−δ@PC-polyHIPEs still remained. The influences of salinity, temperature, and catalyst concentration on the catalytic activity were studied. For MB decomposition under visible light, the activation energy of Sr0.7K0.3TiO3−δ@PC-polyHIPEs was calculated to be 12.3 kJ mol−1 and the kinetics analysis revealed that the photocatalysis followed the second-order reaction. These findings demonstrated that Sr1−xKxTiO3−δ@PC-polyHIPEs were an effective candidate for real application in decomposition of MB in water.

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.

scholarly journals Construction of K+ ions gradient in crystalline carbon nitride to accelerate charge separation for efficient visible light H2 production

2021 ◽  
Author(s):  
Guoqiang Zhang ◽  
Yangsen Xu ◽  
Chuan-Xin He ◽  
Yongliang Li ◽  
Xiangzhong Ren ◽  
...  
Keyword(s):  
Visible Light ◽  
Driving Force ◽  
Carbon Nitride ◽  
Photocatalytic Performance ◽  
H2 Production ◽  
H2 Evolution ◽  
Concentration Gradients ◽  
Diffusion Controlled ◽  
Activity Enhancement ◽  
First Time

Abstract Like most of the recent reported semiconductor photocatalysts, the sluggish dynamic charges transfer and separation caused by weak driving force still restricts the further improvement of photocatalytic performance in crystalline carbon nitride (CCN). Here, we successfully prepared a series of heptazine-based K+ implanted CCN (KCN) for the first time, where the K+ ions concentration was gradiently inserted through controlling its diffusion from the surface to bulk in carbon nitride (CN). As a powerful driving force, the built-in electric field (BIEF) induced by this concentration gradient, greatly accelerates the drift movement and the transport from bulk to the surface, as well as the separation of photogenerated carriers. Consequently, the KCN with optimized BIEF displays a ～34 times promotion than original CN for visible-light H2 evolution. Such a high activity enhancement factor is at a relatively good level in reported CCN. Our proposed strategy to induce BIEF production by constructing concentration gradients through thermodynamically feasible diffusion controlled solid-state reaction, can be adopted to build other efficient photocatalytic systems.

scholarly journals Growth Process and CQDs-modified Bi4Ti3O12 Square Plates with Enhanced Photocatalytic Performance

Micromachines ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 66 ◽  
Author(s):  
Xinxin Zhao ◽  
Hua Yang ◽  
Ziming Cui ◽  
Xiangxian Wang ◽  
Zao Yi
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Growth Process ◽  
Photocatalytic Performance ◽  
Simulated Sunlight ◽  
Hydrothermal Route ◽  
Electron Hole ◽  
X Ray ◽  
Photocurrent Spectroscopy

Bi4Ti3O12 square plates were synthesized via a hydrothermal route, and their growth process was systematically investigated. Carbon quantum dots (CQDs) were prepared using glucose as the carbon source, which were then assembled on the surface of Bi4Ti3O12 square plates via a hydrothermal route with the aim of enhancing the photocatalytic performance. XRD (X-ray powder diffraction), SEM (scanning electron microscopy), TEM (transmission electron microscopy), UV-vis DRS (diffuse reflectance spectroscopy), XPS (X-ray photoelectron spectroscopy), FTIR (Fourier transform infrared spectroscopy), PL (photoluminescence) spectroscopy, EIS (electrochemical impedance spectroscopy) and photocurrent spectroscopy were used to systematically characterize the as-prepared samples. It is demonstrated that the decoration of CQDs on Bi4Ti3O12 plates leads to an increased visible light absorption, slightly increased bandgap, increased photocurrent density, decreased charge-transfer resistance, and decreased PL intensity. Simulated sunlight and visible light were separately used as a light source to evaluate the photocatalytic activity of the samples toward the degradation of RhB in aqueous solution. Under both simulated sunlight and visible light irradiation, CQDs@Bi4Ti3O12 composites with an appropriate amount of CQDs exhibit obviously enhanced photocatalytic performance. However, the decoration of excessive CQDs gives rise to a decrease in the photocatalytic activity. The enhanced photocatalytic activity of CQDs-modified Bi4Ti3O12 can be attributed to the following reasons: (1) The electron transfer between Bi4Ti3O12 and CQDs promotes an efficient separation of photogenerated electron/hole pairs in Bi4Ti3O12; (2) the up-conversion photoluminescence emitted from CQDs could induce the generation of additional electron/hole pairs in Bi4Ti3O12; and (3) the photoexcited electrons in CQDs could participate in the photocatalytic reactions.

Effect of controlling the number of fused rings on polymer photocatalysts for visible-light-driven hydrogen evolution

2019 ◽  
Vol 7 (40) ◽  
pp. 22924-22929 ◽  
Author(s):  
Li-Yu Ting ◽  
Jayachandran Jayakumar ◽  
Chih-Li Chang ◽  
Wei-Cheng Lin ◽  
Mohamed Hammad Elsayed ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Photocatalytic Performance ◽  
Visible Light Driven ◽  
First Time

The introduction of fused thiophene units into the fluorene analogues, for the first time, resulted in an improved photocatalytic performance of the polymer photocatalysts.

Construction of a novel BiSI/MoS2 nanocomposite with enhanced visible-light driven photocatalytic performance

2018 ◽  
Vol 42 (22) ◽  
pp. 18236-18241 ◽  
Author(s):  
Samin Bargozideh ◽  
Mahboubeh Tasviri
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Visible Light Driven ◽  
First Time

A BiSI/MoS2 nanocomposite was synthesized for the first time and used as a new efficient and stable visible light driven photocatalyst.

Facile synthesis of ultrathin SnNb2O6 nanosheets towards improved visible-light photocatalytic H2-production activity

2016 ◽  
Vol 52 (53) ◽  
pp. 8239-8242 ◽  
Author(s):  
Chao Zhou ◽  
Yufei Zhao ◽  
Lu Shang ◽  
Run Shi ◽  
Li-Zhu Wu ◽  
...  
Keyword(s):  
Visible Light ◽  
H2 Production ◽  
Facile Synthesis ◽  
Hydrothermal Route ◽  
Facile Hydrothermal Route ◽  
Production Activity ◽  
First Time ◽  
Visible Light Photocatalytic

Ultrathin SnNb2O6 nanosheets with enhanced visible-light photocatalytic H2-production activity were prepared for the first time via a facile hydrothermal route using ultrathin K4Nb6O17 nanosheets as the precursor.

A highly efficient photocatalyst based on layered g-C3N4/SnS2 composites

2021 ◽  
Vol 17 ◽  
Author(s):  
Yina Wang ◽  
Le Wang ◽  
Jiwei Wang ◽  
Jimin Du
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Surface Reaction ◽  
Layer Structure ◽  
Catalytic Performance ◽  
Ion Transfer ◽  
Hydrothermal Route ◽  
Highly Efficient ◽  
Facile Hydrothermal Route ◽  
Better Than

Background: In this report, the layered g-C3N4/SnS2 composite was successfully fabricated by a facile hydrothermal route. Methods: The ultraviolet-visible spectroscopy data presented that such layered g-C3N4/SnS2 catalysts showed a remarkable visible-light absorption, hence significantly enhancing the catalytic activity. Particularly, the g-C3N4/SnS2 catalysts showed an outstanding catalytic performance for the degradation of methylene blue (~ 98.1%) under visible light irradiation that is much better than that of pure SnS2 (~ 86.7%) and pure g-C3N4 (~ 67.3%). Results: The remarkable photocatalytic performance is ascribed to its layer structure resulting in a large surface area, which not only improves the ion transfer rate but also provides abundant surface reaction sites. Conclusion: Our work demonstrates that the layered g-C3N4/SnS2 can be considered as an exceptional candidate for highly-efficient photocatalyst.

Fabrication of novel p–n heterojunction BiOI/La2Ti2O7 composite photocatalysts for enhanced photocatalytic performance under visible light irradiation

2016 ◽  
Vol 45 (19) ◽  
pp. 7986-7997 ◽  
Author(s):  
Yanhui Ao ◽  
Kedan Wang ◽  
Peifang Wang ◽  
Chao Wang ◽  
Jun Hou
Keyword(s):  
Visible Light ◽  
Organic Pollutants ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
Light Irradiation ◽  
Composite Photocatalyst ◽  
Composite Photocatalysts ◽  
First Time

A novel BiOI/La2Ti2O7 composite photocatalyst with p–n heterojunctions was prepared for the first time. The as-obtained photocatalysts exhibit efficient activity under visible light irradiation for degradation of organic pollutants.

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