scholarly journals Synthesis of Tungsten Oxide as Visible Light-Driven Photocatalyst for Removal of Salicylic Acid

2014 ◽  
Vol 7 (1) ◽  
Author(s):  
Leny Yuliati ◽  
Mazalan Maisarah ◽  
Hendrik O. Lintang
Keyword(s):  
Photocatalytic Activity ◽  
Salicylic Acid ◽  
Visible Light ◽  
Tungsten Oxide ◽  
High Photocatalytic Activity ◽  
X Ray Diffraction ◽  
Calcination Temperatures ◽  
Visible Light Driven ◽  
Loading Amount ◽  
Mesoporous Carbon Nitride

In the present study, tungsten oxide (WO3) was prepared using mesoporous carbon nitride (m-C3N4) as a template. Based on the results obtained from X-ray diffraction (XRD) and diffuse reflectance (DR) UV-Visible spectroscopy, it was confirmed that WO3 can be successfully prepared at all investigated calcination temperatures, even at low temperature of 200°C. It was found that the WO3 prepared at 700°C using m-C3N4 showed higher photocatalytic activity than the WO3 commercial for salicylic acid removal under visible light irradiation. With the optimum loading amount of platinum as cocatalyst, 80.6% of salicylic acid removal was obtained on the prepared WO3. It was suggested that the small particle size and the high crystallinity of the prepared WO3 played important role in giving high photocatalytic activity.

Hydrothermal Synthesis and Visible-Light-Driven Photocatalytic Activities of Bi2WO6 Uniform Hierarchical Microspheres

2014 ◽  
Vol 887-888 ◽  
pp. 181-184
Author(s):  
Yan Lan ◽  
Xiong Wang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
High Photocatalytic Activity ◽  
X Ray Diffraction ◽  
Facile Hydrothermal Method ◽  
Photo Degradation ◽  
Hierarchical Microspheres ◽  
Excellent Photocatalytic Activity ◽  
Photocatalytic Activities ◽  
Visible Light Driven

The microsphere Bi2WO6has been synthesized by a facile hydrothermal method by using Bi (NO3)35H2O, H40N10O41W125H2O and CO(NH2)2(urea) as the starting materials. The as-synthesized Bi2WO6was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM),BET and UV-vis absorption spectroscopy. The visible-light-responsive photocatalytic activity of Bi2WO6microspheres was evaluated by the photo-degradation of RhB under Xe lamp irradiation. The degradation is up to 96% in 3h. The results show that microsphere Bi2WO6exhibited excellent photocatalytic activity. The reasons for the high photocatalytic activity have been discussed carefully.

Effects of Synthesis Conditions on the Crystalline Phases and Photocatalytic Activities of Silver Vanadates via Hydrothermal Method

2009 ◽  
Vol 1171 ◽  
Author(s):  
Chao-Ming Huang ◽  
Guan T. Pan ◽  
Lung C. Chen ◽  
C.K. Thomas Yang ◽  
Wen S. Chang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Area ◽  
Synthesis Method ◽  
Stoichiometric Ratio ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
Synthesis Conditions ◽  
Vis Spectroscopy ◽  
Visible Light Driven

AbstractVisible-light-driven Ag3VO4 photocatalysts were successfully synthesized using low-temperature hydrothermal synthesis method. Under various hydrothermal conditions, the structures of silver vanadates were tuned by manipulating the hydrothermal time and the ratio of silver to vanadium. X-ray diffraction (XRD) results reveal that the powders prepared in a stoichiometric ratio consisted of pure α-Ag3VO4 or mixed phases of Ag4V2O7 and α-Ag3VO4. With increasing the Ag-to-V mole ratio to 6:1, the resulting samples were identified as pure monoclinic structure α-Ag3VO4. UV-vis spectroscopy indicated that silver vanadate particles had strong visible light absorption with associated band gaps in the range of 2.2-2.5 eV. The sample synthesized in the excess silver exhibited higher photocatalytic activity than that synthesized in a stoichiometric ratio. The powder synthesized at silver-rich at 140℃ for 4 h (SHT4) exhibited the highest photocatalytic activity among all samples. The reactivity of SHT4 (surface area, 3.52 m2 g-1) on the decomposition of gaseous benzene was about 16 times higher than that of P25 (surface area, 49.04 m2 g-1) under visible light irradiation. A well developed crystallinity of Ag3VO4 of SHT 4 was considered to enhance the photocatalytic efficiency.

The construction of NiFeSx/g-C3N4 composites with high photocatalytic activity towards the degradation of refractory pollutants

2021 ◽  
Vol 50 (7) ◽  
pp. 2436-2447
Author(s):  
Guoqing Zhao ◽  
Jun Hu ◽  
Jiao Zou ◽  
Jingang Yu ◽  
Feipeng Jiao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
High Photocatalytic Activity ◽  
Degradation Efficiency ◽  
Visible Light Driven

Novel NiFeSx/g-C3N4 composites can achieve visible-light-driven photocatalysis and exhibit good degradation efficiency toward refractory pollutants.

Facile preparation of semimetallic MoP2 as a novel visible light driven photocatalyst with high photocatalytic activity

2015 ◽  
Vol 3 (19) ◽  
pp. 10360-10367 ◽  
Author(s):  
Tianli Wu ◽  
Shijian Chen ◽  
Dingke Zhang ◽  
Junke Hou
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
High Photocatalytic Activity ◽  
Light Irradiation ◽  
Visible Light Driven ◽  
Facile Preparation

In this work, semimetallic MoP2 nanoparticles are discovered as a new photocatalyst to efficiently degenerate methyl orange and produce H2 from water under visible light irradiation.

Preparation YbFeO3 by Microwave Assisted Method and its Visible-Light Photocatalytic Activity

2013 ◽  
Vol 699 ◽  
pp. 708-711 ◽  
Author(s):  
Ling Xiang Jia ◽  
Jun Yue Zhu ◽  
Ting Ting Lin ◽  
Zhen Jiang ◽  
Chao Wan Tang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Diffuse Reflectance Spectroscopy ◽  
High Photocatalytic Activity ◽  
Raw Material ◽  
X Ray Diffraction ◽  
Microwave Assisted ◽  
Average Grain Size ◽  
Uv Visible ◽  
Microwave Assisted Method

Using Yb(NO3)3•6H2O and Fe(NO3)3•9H2O as raw material, the YbFeO3 nanoparticles were synthesized by microwave assisted method. The YbFeO3 nanoparticles were characterized by thermogravimetry and differential thermal analysis (TG-DTA), powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-visible diffuse reflectance spectroscopy (DRS). It was found that the prepared YbFeO3 show an average grain size of 80 nm in diameter, and strong visible-light absorption with absorption onset of 608 nm, indicating a narrow optical band gap of 2.04eV. Consequently, the YbFeO3 nanoparticles show high photocatalytic activity for decomposition of methylene blue under visible-light irradiation.

Visible-light-driven Cr(vi) reduction by ferrocene-integrated conjugated porous polymers via dual catalytic routes

2021 ◽  
Author(s):  
Yan Wang ◽  
Weijie Zhang ◽  
Yumin Yang ◽  
Juntao Tang ◽  
Chunyue Pan ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Conjugated Polymers ◽  
High Photocatalytic Activity ◽  
Porous Polymers ◽  
Visible Light Driven

We developed two ferrocene-functionalized conjugated polymers (Fc-CPPs) and reported a dual catalytic pathway with high photocatalytic activity towards Cr(vi) reduction.

Study of Cyclohexane Photooxidation over Pt-WO3 Catalysts Mixed with TiO2 under Visible Light Irradiation

2010 ◽  
Vol 658 ◽  
pp. 149-152 ◽  
Author(s):  
Yuichi Ichihashi ◽  
Shingo Saijo ◽  
Masaaki Taniguchi ◽  
Keita Taniya ◽  
Satoru Nishiyama
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Visible Light ◽  
Tungsten Oxide ◽  
Visible Light Irradiation ◽  
High Photocatalytic Activity ◽  
Light Irradiation ◽  
Tio2 Photocatalyst ◽  
Physical Mixing ◽  
Platinum Loading

The photooxidation of cyclohexane to cyclohexanone, cyclohexanol and CO2 was carried out by visible light irradiation to tungsten oxide photocatalysts. The physical mixing of tungsten oxide and titanium oxide (WO3+TiO2) led to the high photocatalytic activity. It was speculated that the physical mixing of WO3 and TiO2 took place the charge transfer between WO3 and TiO2, and this inhibited the recombination between electrons and holes on the WO3 surface. The platinum loading on WO3 further developed the photocatalytic activity of WO3+TiO2 photocatalyst. Hence, the degree of the recombination between electrons and holes may dominate the photocatalytic activity of cyclohexane oxidation.

Photodegradation of Dyeing Wastewater by High Photocatalytic Activity TiO2 under UV and Visible-Light Irradiation

2011 ◽  
Vol 374-377 ◽  
pp. 855-858
Author(s):  
Jin Fen Niu ◽  
Bing Hua Yao ◽  
Jia Wei
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
High Photocatalytic Activity ◽  
Precipitation Method ◽  
Dyeing Wastewater ◽  
Phase Precipitation ◽  
X Ray Diffraction ◽  
Tio2 Photocatalysts ◽  
X Ray ◽  
Decoloration Rate

High photocatalytic activity TiO2 photocatalysts were prepared using titanium(IV) sulphate as the precursor by liquid-phase precipitation method. X-ray diffraction and TEM were employed to characterize the morphology, structure of the photocatalysts. Photocatalysic activity of TiO2 prepared by this method was investigated using photocatalytic degradation of methyl red (MR) under UV and visible-light (VL) irradiation as the model reaction. The results indicated that the highest catalytic activity TiO2 catalyst was prepared under 700°C calcination for 4h. The optimum decoloration rate of simulated dyeing wastewater for MR reached to 95% and 98% after UV and visible-light illuminating for 30 min and 140min respectively.

Synthesis of BiVO4/Bi2VO5.5 Heterogeneous Nanostructures with Enhanced Visible Light Photocatalytic Activity

2016 ◽  
Vol 847 ◽  
pp. 211-217
Author(s):  
Jian Min Wang ◽  
Feng Cao ◽  
Xin Lv ◽  
Song Li ◽  
Jia Jia Cai ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Separation Efficiency ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Driven ◽  
Visible Light Photocatalytic

BiVO4/Bi2VO5.5 heterogeneous nanostructures with enhanced visible light photocatalytic activity were successfully prepared by a facile one-pot solvothermal method, where diethylene glycol (DEG) was used as the solvent. The as-prepared products were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectrometry (XPS) and UV-Vis absorption spectroscopy. The results revealed that the molar ratio of Bi3+ to VO43- played an important role in the formation of crystal and morphology. These BiVO4/Bi2VO5.5 heterogeneous nanostructures exhibited higher visible-light-driven photocatalytic efficiency compared to the pure BiVO4 and Bi2VO5.5. For the methyl orange (MO) degradation efficiency of BiVO4/Bi2VO5.5 heterogeneous nanostructures under visible light irradiation, about 95% of MO was degraded within 40min, which is much higher than pure BiVO4 and Bi2VO5.5. The enhancement of photocatalytic activity can attribute to the promoted light absorption capability and the separation efficiency of photo-generated electron-hole pairs.

Hydrothermal Synthesis and Visible-Light-Driven Photocatalytic Activity of Allophane – Wakefieldite-(Ce) Composite

2014 ◽  
Vol 896 ◽  
pp. 545-548
Author(s):  
Mirabbos Hojamberdiev ◽  
Yuki Makinose ◽  
Kenichi Katsumata ◽  
Toshihiro Isobe ◽  
Nobuhiro Matsushita ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Visible Light ◽  
Gas Phase ◽  
X Ray Diffraction ◽  
Mechanical Mixing ◽  
X Ray ◽  
Surface Areas ◽  
Visible Light Driven ◽  
Gas Molecules

In this study, highly adsorptive mechanically-mixed and as-synthesized allophane–wakefieldite-(Ce) composites were prepared by mechanical mixing and hydrothermal synthesis, respectively. The results from X-ray diffraction and Raman spectroscopy analyses show that the mechanically-mixed composite has higher crystallinity than the as-synthesized composite. The nanoparticles of wakefieldite-(Ce) were homogenously distributed with allophane in the as-synthesized composite. The specific surface areas of the mechanically-mixed and as-synthesized composites are 164 m2/g and 191 m2/g, respectively. The photocatalytic activity of the samples was evaluated for the degradation of acetaldehyde (AcH) gas under visible light. Both composites demonstrated higher photocatalytic activity than individual wakefieldite-(Ce) and allophane because allophane in the composites played an important role in the adsorption of acetaldehyde gas molecules and the mediation between the gas phase and the wakefieldite-(Ce) surface.

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