scholarly journals Fabrication of hollow flower-like magnetic Fe3O4/C/MnO2/C3N4 composite with enhanced photocatalytic activity

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mingliang Ma ◽  
Yuying Yang ◽  
Yan Chen ◽  
Jiabin Jiang ◽  
Yong Ma ◽  
...  
Keyword(s):  
Photocatalytic Performance ◽  
Structure Characterization ◽  
Green Economy ◽  
Hollow Core ◽  
Composite Photocatalyst ◽  
Morphology And Structure ◽  
Magnetic Fe3o4 ◽  
In Situ Coating ◽  
Energy Shortage

AbstractThe serious problems of environmental pollution and energy shortage have pushed the green economy photocatalysis technology to the forefront of research. Therefore, the development of an efficient and environmentally friendly photocatalyst has become a hotpot. In this work, magnetic Fe3O4/C/MnO2/C3N4 composite as photocatalyst was synthesized by combining in situ coating with low-temperature reassembling of CN precursors. Morphology and structure characterization showed that the composite photocatalyst has a hollow core–shell flower-like structure. In the composite, the magnetic Fe3O4 core was convenient for magnetic separation and recovery. The introduction of conductive C layer could avoid recombining photo-generated electrons and holes effectively. Ultra-thin g-C3N4 layer could fully contact with coupled semiconductor. A Z-type heterojunction between g-C3N4 and flower-like MnO2 was constructed to improve photocatalytic performance. Under the simulated visible light, 15 wt% photocatalyst exhibited 94.11% degradation efficiency in 140 min for degrading methyl orange and good recyclability in the cycle experiment.

In situ construction of WO3/g-C3N4 composite photocatalyst with 2D–2D heterostructure for enhanced visible light photocatalytic performance

2019 ◽  
Vol 43 (44) ◽  
pp. 17416-17422 ◽  
Author(s):  
Huaqiang Zhuang ◽  
Zhenping Cai ◽  
Wentao Xu ◽  
Mianli Huang ◽  
Xiaobin Liu
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Composite Photocatalyst ◽  
Preparation Strategy ◽  
Visible Light Photocatalytic

A WO3/g-C3N4 composite photocatalyst with 2D–2D heterostructure was designed and constructed by an in situ preparation strategy.

A PW12/Ag functionalized mesoporous silica-coated magnetic Fe3O4 core–shell composite as an efficient and recyclable photocatalyst

2021 ◽  
Author(s):  
Pan-Feng Wu ◽  
Qi Xue ◽  
Tian-Yu Wang ◽  
Shan-Jian Li ◽  
Gao-Peng Li ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Photocatalytic Performance ◽  
Core Shell ◽  
Deposition Method ◽  
Functionalized Mesoporous Silica ◽  
Recyclable Photocatalyst ◽  
Shell Composite ◽  
Magnetic Fe3o4 ◽  
Fe3o4 Core

The PW12 and Ag NP functionalized Fe3O4@SiO2@mSiO2-PW12/Ag photocatalyst was assembled via an in situ photoreduction deposition method, displaying highly efficient photocatalytic performance for photodegradation of MO and photoreduction of Cr2O72−.

scholarly journals Fabrication of Novel ZIF-8@BiVO4 Composite with Enhanced Photocatalytic Performance

Crystals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 432 ◽  
Author(s):  
Yun-hui Si ◽  
Ya-yun Li ◽  
Yu Xia ◽  
Shao-ke Shang ◽  
Xin-bo Xiong ◽  
...  
Keyword(s):  
Photocatalytic Performance ◽  
Metal Organic Framework ◽  
X Ray Diffraction ◽  
Composite Photocatalyst ◽  
Photodegradation Efficiency ◽  
Photogenerated Electrons ◽  
Growth Method ◽  
Metal Organic

In this work, a novel metal-organic framework (MOF) and BiVO4 (BVO) composite photocatalyst was successfully synthesized by an in-situ growth method. The characterization of obtained samples was done by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, N2 adsorption, and photoluminescence spectroscopy. The photocatalytic performance of ZIF-8@BiVO4 composite was evaluated by the degradation of methylene blue (MB) under simulated visible light irradiation. Compared with the mixture of BVO and ZIF-8, the composite photocatalyst exhibited superior photodegradation efficiency, which could be attributed to the synergistic effect between BVO and ZIF-8. The reduced recombination of photogenerated electrons and holes was considered to be an important reason for the enhancement of photocatalytic performance. This design demonstrates a rational method to improve the photocatalytic performance by combining photocatalysts with MOFs.

In-situ construction of direct Z-scheme AgBr/α-Ag2WO4 heterojunction with promoted spatial charge migration and photocatalytic performance

2021 ◽  
Author(s):  
Xiao-Ya Zhai ◽  
Yifan Zhao ◽  
Guo-Ying Zhang ◽  
Bing-Yu Wang ◽  
Qi-Yun Mao
Keyword(s):  
Anion Exchange ◽  
Large Scale ◽  
Room Temperature ◽  
Photocatalytic Performance ◽  
Charge Migration ◽  
Time Saving ◽  
Spatial Charge ◽  
Construction Strategy ◽  
Large Scale Synthesis

In the work, a direct Z-scheme AgBr/α-Ag2WO4 heterojunction was prepared by in-situ anion exchange at room temperature. The construction strategy is energy- and time-saving for large scale synthesis. The α-Ag2WO4...

scholarly journals Carbon Nitride Quantum Dots Modified TiO2 Inverse Opal Photonic Crystal for Solving Indoor VOCs Pollution

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 464
Author(s):  
Jie Yu ◽  
Angel Caravaca ◽  
Chantal Guillard ◽  
Philippe Vernoux ◽  
Liang Zhou ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Nitride ◽  
Sol Gel ◽  
Green Energy ◽  
Inverse Opal ◽  
Oxidation Reactions ◽  
Composite Photocatalyst ◽  
Colloidal Photonic Crystals ◽  
Inverse Opal Structure

Indoor toxic volatile organic compounds (VOCs) pollution is a serious threat to people’s health and toluene is a typical representative. In this study, we developed a composite photocatalyst of carbon nitride quantum dots (CNQDs) in situ-doped TiO2 inverse opal TiO2 IO for efficient degradation of toluene. The catalyst was fabricated using a sol-gel method with colloidal photonic crystals as the template. The as-prepared catalyst exhibited excellent photocatalytic performance for degradation of toluene. After 6 h of simulated sunlight irradiation, 93% of toluene can be converted into non-toxic products CO2 and H2O, while only 37% of toluene is degraded over commercial P25 in the same condition. This greatly enhanced photocatalytic activity results from two aspects: (i) the inverse opal structure enhances the light harvesting while providing adequate surface area for effective oxidation reactions; (ii) the incorporation of CNQDs in the framework of TiO2 increases visible light absorption and promotes the separation of photo-generated charges. Collectively, highly efficient photocatalytic degradation of toluene has been achieved. In addition, it can be expanded to efficient degradation of organic pollutants in liquid phase such as phenol and Rhodamine B. This study provides a green, energy saving solution for indoor toxic VOCs removal as well as for the treatment of organic wastewater.

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