Fabrication of surface hydroxyl modified g-C3N4with enhanced photocatalytic oxidation activity

2019 ◽  
Vol 9 (15) ◽  
pp. 3979-3993 ◽  
Author(s):  
Zizhen Li ◽  
Xiangchao Meng ◽  
Zisheng Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Surface Modification ◽  
Phenolic Compounds ◽  
Photocatalytic Oxidation ◽  
Oxidation Activity ◽  
Surface Hydroxyl

Photocatalytic activity of C3N4in the decomposition of phenolic compounds in water was significantly improved with hydroxyl surface modification.

Controllable synthesis of phosphate-modified BiPO4 nanorods with high photocatalytic activity: surface hydroxyl groups concentrations effects

RSC Advances ◽  
2015 ◽  
Vol 5 (121) ◽  
pp. 99712-99721 ◽  
Author(s):  
Yan Li ◽  
Yawen Wang ◽  
Yu Huang ◽  
Junji Cao ◽  
Wingkei Ho ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Surface Modification ◽  
Photocatalytic Performance ◽  
High Photocatalytic Activity ◽  
Hydroxyl Groups ◽  
Controllable Synthesis ◽  
Surface Hydroxyl ◽  
Methylene Orange ◽  
Surface Hydroxyl Groups

Surface modification by phosphate efficiently improves the photocatalytic performance of BiPO4 for the degradation of methylene orange (MO), by enhancing the concentration of surface hydroxyl groups and improving its hydrophilicity.

New insights into the relationship between photocatalytic activity and TiO2–GR composites

RSC Advances ◽  
2015 ◽  
Vol 5 (37) ◽  
pp. 29201-29208 ◽  
Author(s):  
Yanyan Zhu ◽  
Yajun Wang ◽  
Wenqing Yao ◽  
Ruilong Zong ◽  
Yongfa Zhu
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Oxidation ◽  
Photocatalytic Reduction ◽  
Photoelectrochemical Properties ◽  
Oxidation Activity ◽  
Reduction Activity ◽  
The Relationship

Composited graphene cannot enhance the photocatalytic oxidation activity of TiO2, but can improve its photocatalytic reduction activity and photoelectrochemical properties.

Preparation and enhanced photocatalytic oxidation activity of surface-modified CdS nanoparticles with high photostability

1999 ◽  
Vol 14 (5) ◽  
pp. 2092-2095 ◽  
Author(s):  
M. Y. Han ◽  
W. Huang ◽  
C. H. Quek ◽  
L. M. Gan ◽  
C. H. Chew ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Surface Modification ◽  
Photocatalytic Oxidation ◽  
Uv Light ◽  
Cds Nanoparticles ◽  
Oxidation Activity ◽  
Chemical Surface ◽  
Photo Oxidation ◽  
Chemical Surface Modification ◽  
Surface Modified

Highly photostable CdS nanoparticles modified with an alkyl group were prepared by an improved microemulsion technique using hexanethiol as cosurfactant. The surface-modified CdS nanoparticles catalyzed the photo-oxidation of 4-chlorophenol via continuously bubbling oxygen under uv light. The photocatalytic oxidation activity of the CdS nanoparticles was enhanced due to the formation of their compact CdS cores with strong chemical surface modification by heat treatment.

scholarly journals An Effective Approach to Improve the Photocatalytic Activity of Graphitic Carbon Nitride via Hydroxyl Surface Modification

Catalysts ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 17 ◽  
Author(s):  
Zizhen Li ◽  
Xiangchao Meng ◽  
Zisheng Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Surface Modification ◽  
Water Treatment ◽  
Phenolic Compounds ◽  
Visible Light ◽  
Adsorption Energy ◽  
Carbon Nitride ◽  
Hydrophobic Surface ◽  
Hydroxyl Groups ◽  
Photocatalytic Activities

In this work, we have developed a hydrothermal method to modify g-C3N4 with hydroxyl surface modification. Modified g-C3N4 has exhibited higher photocatalytic activity in the removal of phenolic compounds under visible light. The improvement may be due to the following merits: (1) Tuning of the hydrophobic surface of g-C3N4 to be hydrophilic; (2) improved adsorption energy, and (3) narrowed band gap for g-C3N4 after hydroxyl surface modification. This method is easy-to-operate, very effective in adding hydroxyl groups on the surface of C3N4, and may be extended to other systems to promote their photocatalytic activities in water treatment.

A review on TiO2-based composites for superior photocatalytic activity

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Wail Al Zoubi ◽  
Abbas Ali Salih Al-Hamdani ◽  
Baek Sunghun ◽  
Young Gun Ko
Keyword(s):  
Photocatalytic Activity ◽  
Organic Pollutants ◽  
Cost Efficiency ◽  
High Stability ◽  
Photocatalytic Oxidation ◽  
Oxidation Process ◽  
Ambient Conditions ◽  
Photoelectrochemical Activity ◽  
As Doping ◽  
Degradation Of Pollutants

Abstract Heterogeneous photocatalysts was a promising material for removing organic pollutants. Titanium dioxide (TiO2) was a suitable photocatalyst for its cost efficiency and high stability to reduce various pollutants. Enhancing TiO2 photocatalyst performance by doping with changed metals or non-metal ions and organic compounds have been reviewed. These methods could enhance photoelectrochemical activity via: (i) by a donor of electrons via electron-donor agents that would produce particular defects in TiO2 structure and capture transporters of charge; (ii) by reducing recombination rate of the charge transporters and increasing degradation of pollutants. This study investigates the modification approaches of TiO2 that comprise methods for overcoming the essential TiO2 restrictions and enhancing the photocatalytic degradation of organic pollutants. Consequently, it emphasized on the current progress of modified-TiO2 used for different pollutants in ambient conditions. Amendment techniques, such as inorganic and organic parts as doping, are studied. The reported experimental results obtained with the photocatalytic oxidation process for degrading organic pollutants were also collected and assessed.

scholarly journals Enhanced Drag Reduction Performance of Nanocomposites: The Effects of Surface Modification of Nano Silica

2017 ◽  
Vol 26 (4) ◽  
pp. 096369351702600 ◽  
Author(s):  
Xiaodong Dai ◽  
Guicai Zhang ◽  
Bing Li ◽  
Jijiang Ge ◽  
Xuewu Wang ◽  
...  
Keyword(s):  
Surface Modification ◽  
Drag Reduction ◽  
Rotating Disk ◽  
Shear Resistance ◽  
Test Results ◽  
Nano Silica ◽  
Surface Hydroxyl ◽  
Adsorption Analysis ◽  
Oil Adsorption ◽  
Loop 2

In this paper, nanocomposite was synthesized with nano silica and poly-α-olefin, and the effects of surface modification to the nano silica on its drag reduction performance were investigated. The dosage coupling agent, Y-aminopropyltriethoxysilane, and the modification temperature were studied intensively through surface hydroxyl and oil adsorption analysis. The test results indicated that the hydroxyl number of the silica was decreased by Y-aminopropyltriethoxysilane modification, with improved lipophilicity and oil adsorption. At 50°C, the optimum Y-aminopropyltriethoxysilane dosages were 15% for Nano-Si-10, 5% for Nano-Si-20, and 10% for Degussa-R972. The modification significantly changed the nano silica surface properties and enhanced the interaction with poly-α-olefin. Through drag reduction and shear resistance tests by rotating disk 40 mins degradation and testing loop 2 times shearing, it was shown that the nanocomposite possessed good drag reduction and excellent shear resistance properties.

scholarly journals Facile Preparation of Efficient WO3Photocatalysts Based on Surface Modification

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Min Liu ◽  
Hongmei Li ◽  
Yangsu Zeng
Keyword(s):  
Photocatalytic Activity ◽  
Surface Modification ◽  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Impregnation Method ◽  
Light Spectra ◽  
Simple Strategy ◽  
Visible Light Active ◽  
Efficient Charge ◽  
Surface Modified

Tungsten trioxide (WO3) was surface modified with Cu(II) nanoclusters and titanium dioxide (TiO2) nanopowders by using a simple impregnation method followed by a physical combining method. The obtained nanocomposites were studied by scanning electron microscope, X-ray photoelectron spectroscopy spectra, UV-visible light spectra, and photoluminescence, respectively. Although the photocatalytic activity of WO3was negligible under visible light irradiation, the visible light photocatalytic activity of WO3was drastically enhanced by surface modification of Cu(II) nanoclusters and TiO2nanopowders. The enhanced photocatalytic activity is due to the efficient charge separation by TiO2and Cu(II) nanoclusters functioning as cocatalysts on the surface. Thus, this simple strategy provides a facile route to prepare efficient visible-light-active photocatalysts for practical application.

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