scholarly journals Mesoporous titania nanoparticles as photocatalyst for degradation of 2-chlorophenol

2021 ◽  
Vol 7 (1) ◽  
pp. 32-36
Author(s):  
N. F. Jaafar ◽  
N. A. Marfur
Keyword(s):  
Surface Area ◽  
Uv Light ◽  
Titania Nanoparticles ◽  
Mesoporous Titania ◽  
Microwave Assisted ◽  
Uv Light Irradiation ◽  
Good Potential ◽  
Degussa P25 ◽  
Lower Particle Size ◽  
Commercial Tio2

Mesoporous titania nanoparticles (MTN) was successfully prepared by microwave-assisted menthod. The performance of MTN was compared with degussa P25 (commercial TiO2) on photocatalytic degradation of 2-chlorophenol (2-CP). Both catalysts were characterized by XRD, FTIR, UV-Vis DRS and surface area analysis. The characterization data indicated that MTN has higher surface area and lower particle size than P25. The 2-CP was successfully degraded completely under UV light irradiation despite of having a slightly higher band-gap value compared with P25. This study demonstrated that MTN shows a good potential as a photocatalyst. 

Solvothermal Synthesis of Novel 3D Peony-Like TiO2 Microstructures and its Enhanced Photocatalytic Activity

NANO ◽  
2018 ◽  
Vol 13 (05) ◽  
pp. 1850056 ◽  
Author(s):  
Yugan He ◽  
Qi Yan ◽  
Xiaoyu Chang ◽  
Meiying Zhu ◽  
Weiwei Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Reaction Time ◽  
Uv Light ◽  
X Ray Diffraction ◽  
Reaction Parameters ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Transmission Electron ◽  
Irradiation Power ◽  
Degussa P25

A TiO2 photocatalyst with peony-like microstructures and a large percentage of exposed {001} facets was synthesized using a facile solvethermal method. The peony-like TiO2 was obtained using HF as a capping agent, TiCl4 as the precursor and ethanol as the solvothermal agent. The parameters which influence the mophology and formation mechanism of the products including the HF concentration, the reaction time and temperature and the solvothermal solvent, were investigated. The samples were characterized using field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction and N2 adsorption and desorption analysis. As the reaction time or reaction temperature increased, the morphology TiO2 changed from hexagonally assembled microspheres to peony-like microflowers which were composed of stacks of ultrathin nanosheets. The other reaction parameters also play a crucial role in the formation of the TiO2 microstuctures. Photocatalytic experiments showed that the synthesized TiO2 outperformed Degussa P25 in the photodegradation of methelene blue under a very weak UV light irradiation (power: 8[Formula: see text]W, light intensity: 0.4[Formula: see text]mW[Formula: see text]cm[Formula: see text]).

scholarly journals Microwave-assisted synthesis of mesoporous titania with increased crystallinity, specific surface area, and photocatalytic activity

2016 ◽  
Vol 51 (21) ◽  
pp. 9822-9829 ◽  
Author(s):  
Mieke Meire ◽  
Sammy W. Verbruggen ◽  
Silvia Lenaerts ◽  
Petra Lommens ◽  
Pascal Van Der Voort ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Microwave Assisted Synthesis ◽  
Mesoporous Titania ◽  
Microwave Assisted

scholarly journals Photocatalytic and UV-VIS Optical Properties of Titanium-Silver Doped Composite Synthesized by Hydrothermal Method

2021 ◽  
Vol 78 (1) ◽  
pp. 1-10
Author(s):  
Ahmad Mukifza ◽  
Huzaikha Awang
Keyword(s):  
Optical Properties ◽  
Hydrothermal Method ◽  
Surface Area ◽  
Uv Light ◽  
High Grade ◽  
Problem Statement ◽  
Tio2 Sample ◽  
Methylene Blue Degradation ◽  
Optical Stability ◽  
Commercial Tio2

Titanium (TiO2) has been studied and proved to be the most ideal photocatalyst due to several aspects such as high photoactivity, thermal and chemical stability, relatively inexpensive and non-toxicity. As the problem statement, the photoactivity and optical stability are the crucial aspects to synthesize an ideal photocatalyst. These aspects can be improved through the synthesize method to enhance its nanocrystal crystallinity. The purpose of this research is to synthesize the high crystalline silver-titanium (AgTiO2) nanoparticles and study its photoactivity and optical properties. The Ag-TiO2 was synthesized through the modification of caustic hydrothermal method and molten salt doping process to dope the silver nitrate (AgNO3) as a dopant agent. The photoactivity performance of high grade TiO2 and high crystallinity Ag-TiO2 were examine via a Methylene Blue Degradation (MBD) testing under both visible light and UV light. The optical properties were measured through the Surface Area BET (SBET) and UV-Vis-NIR spectrophotometer (UV-Vis). The UV-Vis results show that the 0.01%-Ag-TiO2 sample has a lowest band gap with 2.6eV compared to the commercial TiO2 (P25) and other samples. The SBET analysation shows that, the biggest surface area was formed in 0.05%-Ag-TiO2 followed by 0.01%-Ag-TiO2, un-doped TiO2 and 0.03%-Ag-TiO2. For the MBD-testing, the high crystalline Ag-TiO2 was performed a better photoactivity compared to the high grade TiO2. The 0.05%-Ag-TiO2 has the best crystallinity and morphology growth compared to 0.01%-Ag-TiO2 and 0.03%-Ag-TiO2 doping samples. The results obtained proves that, the presence of silver dopants was successfully improved the nanocrystal crystallinity of Ag-TiO2 and influenced its photoactivity performance.

MICROWAVE-ASSISTED HYDROTHERMAL SYNTHESIS OF NITROGEN-DOPED TITANIA NANOPARTICLES

2008 ◽  
Vol 01 (03) ◽  
pp. 173-176 ◽  
Author(s):  
SHU YIN ◽  
BIN LIU ◽  
TSUGIO SATO
Keyword(s):  
Visible Light ◽  
Uv Light ◽  
Hydrothermal Process ◽  
Nitrogen Monoxide ◽  
High Specific Surface Area ◽  
Titania Nanoparticles ◽  
Photocatalytic Ability ◽  
Nitrogen Doped ◽  
Microwave Assisted ◽  
Doped Titania

Nitrogen-doped titania ( TiO 2-x N y) nanoparticles with excellent visible-light-reactive photocatalytic activity were successfully prepared by a microwave-assisted hydrothermal process. The obtained TiO 2-x N y powders showed high specific surface area, fine particle size and excellent photocatalytic ability for the oxidative destruction of nitrogen monoxide under irradiation of both visible-light (λ > 510 nm) and UV light (λ > 290 nm).

scholarly journals Advantages of the Incorporation of Luffa-Based Activated Carbon to Titania for Improving the Removal of Methylene Blue from Aqueous Solution

2021 ◽  
Vol 11 (16) ◽  
pp. 7607
Author(s):  
Souad Boumad ◽  
Antonia Infantes-Molina ◽  
Isabel Barroso-Martín ◽  
Elisa Moretti ◽  
Enrique Rodríguez-Castellón ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Activated Carbon ◽  
Surface Area ◽  
Uv Light ◽  
Physical Adsorption ◽  
Chemical Activation ◽  
Tio2 Photocatalysts ◽  
Degussa P25

This research aims to study the possible improvement of methylene blue (MB) removal from aqueous solution by hybrid adsorbent-catalysts (AdsCats) prepared through the incorporation of activated carbon derived from Luffa cylindrica fibers (LAC) to TiO2 photocatalysts. LAC with a specific surface area of 1170 m2/g was prepared by chemical activation with phosphoric acid at 500 °C. TiO2/LAC composites with 70 and 90 wt.% Degussa P25 titania content were prepared. The materials were characterized by N2 physical adsorption, XRD, FTIR, and XPS. The AdsCats displayed a very good dispersion of TiO2 over LAC, a surface area of close to 200 or 400 m2/g, depending on the composition, and high crystallinity, showing the presence of anatase and rutile phases. MB removal was studied in two different scenarios: under UV-light after reaching adsorption equilibrium, and under UV-light once the liquid effluent and the AdsCats were in contact. The MB removal by LAC has proved to be very efficient, highlighting the predominant role of adsorption over photodegradation. The prepared AdsCats have also been compared with their components. The results showed that TiLAC hybrids have superior photocatalytic performance than P25, showing TiLAC-7/3 90% MB removal with respect to the initial concentration just after 30 min of UV light irradiation for both studied scenarios.

scholarly journals Synthesis and Photocatalytic Properties of ZnWO4Nanocrystals via a Fast Microwave-Assisted Method

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Jing Yan ◽  
Yanhua Shen ◽  
Feng Li ◽  
Taohai Li
Keyword(s):  
Uv Light ◽  
X Ray ◽  
Microwave Assisted ◽  
Uv Illumination ◽  
Uv Light Irradiation ◽  
Transmission Electron ◽  
Photocatalytic Activities ◽  
Highly Effective ◽  
Ft Ir ◽  
Microwave Assisted Method

High crystallinity of ZnWO4nanoparticles has been successfully synthesized via a highly effective and environmentally friendly microwave route by controlling the reaction time and temperature. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and Fourier infrared spectrum (FT-IR). The crystallinity was enhanced with the increase of the reaction temperature and time. The photocatalytic activities of ZnWO4nanocrystals were evaluated by testing the photodegradation of rhodamine B (RhB) dye under ultraviolet (UV) light irradiation. The results indicated that as-prepared ZnWO4was highly effective for the degradation of RhB. The degradation rate of RhB reached 98.01% after 6 h of UV illumination.

Synthesis of Nanocrytalline YVO4 by Microwave Assisted Process and its Photocatalytic Activity

2012 ◽  
Vol 178-181 ◽  
pp. 531-534
Author(s):  
Yan Lin Ye ◽  
Pei Song Tang
Keyword(s):  
Photocatalytic Activity ◽  
Diffuse Reflectance Spectroscopy ◽  
Uv Light ◽  
High Photocatalytic Activity ◽  
X Ray Diffraction ◽  
Microwave Assisted ◽  
Uv Light Irradiation ◽  
Tetragonal Crystal ◽  
Bet Method ◽  
Crystal Particle

The YVO4 was synthesized by microwave assisted process. The products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis diffuse reflectance spectroscopy (DRS), thermogravimetry and differential thermal analysis (TG-DTA) and Brunauer-Emmett-Teller (BET) method. The results show that YVO4 was tetragonal crystal, particle size of 50 to 80 nm, band gap of 3.3 eV and surface area of 18.6m2/g. The photocatalytic experiment of YVO4 shows the high photocatalytic activity for the decomposition of methyl orange under UV-light irradiation.

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