scholarly journals Synthesis of Hollow CdS-TiO2Microspheres with Enhanced Visible-Light Photocatalytic Activity

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Yuning Huo ◽  
Jia Zhang ◽  
Xiaofang Chen ◽  
Hexing Li
Keyword(s):  
Visible Light ◽  
Hollow Structure ◽  
Hollow Microsphere ◽  
Visible Light Region ◽  
Polystyrene Microspheres ◽  
Hard Template ◽  
Composite Photocatalyst ◽  
Light Region ◽  
Photocatalytic Activities ◽  
Visible Light Photocatalytic

CdS-TiO2composite photocatalyst in the shape of hollow microsphere was successfully synthesized via the hard-template preparation with polystyrene microspheres followed by ion-exchange approach. The hollow CdS-TiO2microspheres significantly extended the light adsorption into visible light region, comparing to TiO2microspheres. It led to much higher photocatalytic activities of hollow CdS-TiO2microspheres than that of TiO2during the photodegradation of rhodamine B under visible light irradiations. Furthermore, the well-remained hollow structure could achieve light multireflection within the interior cavities and the separation of photo-induced electrons and holes is efficient in CdS-TiO2, which were facilitated to improving the photoactivity.

Visible-Light Photocatalytic Degradation of Methylene Blue with Porphyrin-Sensitized TiO2

2012 ◽  
Vol 441 ◽  
pp. 544-548 ◽  
Author(s):  
Jun Min Wan ◽  
Zhang Zhu Wu ◽  
Hui Gang Wang ◽  
Xu Ming Zheng
Keyword(s):  
Methylene Blue ◽  
Wastewater Treatment ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Visible Light Irradiation ◽  
Visible Light Region ◽  
Light Region ◽  
Copper Porphyrin ◽  
Visible Light Photocatalytic ◽  
Significant Application

The photocatalytic degradation of methylene blue (MB) under visible light irradiation is investigated by using the TiO2photocatalyst sensitized with meso-tetra (4-carboxyphenyl) porphyrin (H2TCPP) and/or meso-tetra (4-carboxyphenyl) copper porphyrin (CuTCPP). The XRD and XPS experimental results indicate that porphyrins are chemisorbed on the surface of TiO2through the O=C-O-Ti chemical bond. The degradation of methylene blue (MB) by H2TCPP and/or CuTCPP sensitized TiO2and under incandescent lamp irradiation is likely through injecting electrons from the photoexcited sensitizer to the conduction band of TiO2. The porphyrin-and/or metallic porphyrin-sensitized TiO2exhibits higher absorbability in the visible-light region than pure TiO2. All facts show that the porphyrin-, and/or metallic porphyrin-sensitized TiO2have potentially a significant application in wastewater treatment.

scholarly journals Application of Plasmonic Metal Nanoparticles in TiO2-SiO2 Composite as an Efficient Solar-Activated Photocatalyst: A Review Paper

2021 ◽  
Vol 8 ◽  
Author(s):  
Collin G. Joseph ◽  
Yun Hin Taufiq-Yap ◽  
Baba Musta ◽  
Mohd Sani Sarjadi ◽  
L. Elilarasi
Keyword(s):  
Visible Light ◽  
Metal Nanoparticles ◽  
Degradation Rate ◽  
Review Paper ◽  
Visible Light Region ◽  
Treatment Processes ◽  
Light Region ◽  
Photocatalytic Activities ◽  
Solar Photocatalyst ◽  
Degradation Effect

Over the last decade, interest in the utilization of solar energy for photocatalysis treatment processes has taken centre-stage. Researchers had focused on doping TiO2 with SiO2 to obtain an efficient degradation rate of various types of target pollutants both under UV and visible-light irradiation. In order to further improve this degradation effect, some researchers resorted to incorporate plasmonic metal nanoparticles such as silver and gold into the combined TiO2-SiO2 to fully optimize the TiO2-SiO2’s potential in the visible-light region. This article focuses on the challenges in utilizing TiO2 in the visible-light region, the contribution of SiO2 in enhancing photocatalytic activities of the TiO2-SiO2 photocatalyst, and the ability of plasmonic metal nanoparticles (Ag and Au) to edge the TiO2-SiO2 photocatalyst toward an efficient solar photocatalyst.

Effect of Calcination Temperature on Light Absorption and Visible Light Photocatalytic Activity of N Doped TiO2 Nano-Crystalline

2020 ◽  
Vol 12 (3) ◽  
pp. 449-453 ◽  
Author(s):  
Bo Wang ◽  
Ruiling Zhang ◽  
Jin Xu ◽  
Songyan Qin ◽  
Jiajun Zheng ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Absorption ◽  
Hydroxyl Groups ◽  
Visible Light Region ◽  
X Ray ◽  
Visible Light Photocatalytic Activity ◽  
Nano Crystalline ◽  
Light Region ◽  
Visible Light Photocatalytic

N doped TiO2 nano-crystalline was prepared through hydrolysis-precipitation process in the presence of ammonia water. The resulting materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). It was found that N was incorporated into the lattice of TiO2 through substituting lattice oxygen atoms and coexisted in the forms of substitutional N (O–Ti–N) and interstitial N (Ti–O–N). Further, doping with N could greatly improve the phase transformation of TiO2 from rutile to anatase and light absorption in visible light region. The high visible light photocatalytic activity for the degradation of RhB of N doped TiO2 was mainly attributed to the small crystallite size, mixed phase composition, intense light absorption in visible light region, narrow band gap energy and surface hydroxyl groups.

Influence of Pt and Pd Modification on the Visible Light Photocatalytic Activity of N-Doped Titania Photocatalysts

2016 ◽  
Vol 16 (4) ◽  
pp. 3570-3576 ◽  
Author(s):  
Yulong Hu ◽  
Fu Dong ◽  
Hongfang Liu ◽  
Xingpeng Guo
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Metallic State ◽  
Visible Light Region ◽  
Electron Hole ◽  
X Ray ◽  
Visible Light Photocatalytic Activity ◽  
Light Region ◽  
Doped Titania ◽  
Visible Light Photocatalytic

Pd and Pt modified N-doped titania nanoparticle powders were prepared by a facile sol–gel method. Nitrogen doping and metal modification were carried out simultaneously during the preparation process. The as-prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS), photoluminescence (PL) spectroscopy and X-ray photoelectron spectroscopy (XPS). The visible light photocatalytic activities of the asprepared samples were evaluated by analyzing their effect on the photocatalytic decomposition of methyl orange (MO). The chemical state of the metal is the key factor determining the performance of metal modified N-doped titania. The Pd used to modify the N-doped titania (Pd-NT) in our study was of the PdOx(x≤2) species, which increased the absorbance in the visible light region, decreased the recombination of photo-generated electron–hole pairs, and resulted in a significant enhancement in the visible light photocatalytic activity. The Pt species used to modify the N-doped titania (Pt-NT) was mainly in the metallic state, which resulted in a decrease in the absorbance in the visible light region, and an increase in the recombination of photo-generated electron–hole pairs. Pt modification led to a deterioration in the visible light photocatalytic activity of the material.

scholarly journals Ultrasonic-Assisted Synthesis of 2D α-Fe2O3@g-C3N4 Composite with Excellent Visible Light Photocatalytic Activity

Catalysts ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 457 ◽  
Author(s):  
Huoli Zhang ◽  
Changxin Zhu ◽  
Jianliang Cao ◽  
Qingjie Tang ◽  
Man Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Optical Absorption ◽  
Visible Light ◽  
Self Assembly ◽  
Carbon Nitride ◽  
Preparation Method ◽  
Visible Light Region ◽  
Light Region ◽  
Ultrasonic Assisted ◽  
Visible Light Photocatalytic

In this study, α-Fe2O3@g-C3N4 photocatalyst was synthesized using an ultrasonic assisted self-assembly preparation method. The α-Fe2O3@g-C3N4 photocatalyst had a stronger optical absorption in the visible light region than pure graphitic carbon nitride (g-C3N4). The Z-Scheme heterojunction between α-Fe2O3 and g-C3N4 significantly inhibited the recombination of electrons and holes. The photocatalytic performances of α-Fe2O3@g-C3N4 photocatalyst were excellent in degradation of Rhodamine B (RhB) under visible light irradiation. The results indicated that 5 wt.% α-Fe2O3/g-C3N4 had the optimal photocatalytic activity because two-dimension (2D) α-Fe2O3 nanosheets can be well-dispersed on the surface of g-C3N4 layers by ultrasonic assisted treatment. A possible photocatalytic mechanism is also discussed.

Fabrication and enhanced visible-light photocatalytic activities of BiVO4/Bi2WO6 composites

RSC Advances ◽  
2014 ◽  
Vol 4 (86) ◽  
pp. 46054-46059 ◽  
Author(s):  
Yanling Geng ◽  
Peng Zhang ◽  
Shaoping Kuang
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Composite Photocatalyst ◽  
Photocatalytic Activities ◽  
Visible Light Photocatalytic

Mechanism of photodegradation over BiVO4/Bi2WO6 composite photocatalyst under visible light irradiation.

Microwave Assisted Solvothermal Synthesis and Visible Light Photocatalytic Properties of Nb and N Co-Doped SrTiO3 Nanoparticles

2010 ◽  
Vol 63 ◽  
pp. 52-57 ◽  
Author(s):  
Uyi Sulaeman ◽  
Shu Yin ◽  
Tsugio Sato
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Solvothermal Synthesis ◽  
Solvothermal Reaction ◽  
Visible Light Region ◽  
Co Doping ◽  
Microwave Assisted ◽  
Light Region ◽  
Co Doped ◽  
Visible Light Photocatalytic

Niobium and nitrogen co-doped SrTiO3 possessing excellent visible light responsive photocatalytic activity was successfully synthesized by microwave-assisted solvothermal reaction using SrCl2.6H2O, Ti(OC3H7)4, NbCl5 and hexamethylenetetramine in KOH aqueous solution. The photocatalytic activity was determined by DeNOx ability using LED lamps with the wavelengths of 627 nm (red), 530 nm (green), 445 nm (blue) and 390 nm (UV). The photocatalytic activity of SrTiO3 for DeNOx ability in visible light region could be improved by co-doping Nb5+ and N3-. The excellent visible light photocatalytic activity of this substance may be due to the generation of a new band gap that enables to absorb visible light and decrease in the lattice defects which acts as a recombination center of photoinduced electrons and holes.

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