Preparation and Photocatalytic Property of Dendritic TiO2/VOx Nanofibers

2015 ◽  
Vol 814 ◽  
pp. 167-172
Author(s):  
Le Tian Teng ◽  
Kang Zhao ◽  
Yu Fei Tang ◽  
Xi Chen
Keyword(s):  
Methyl Orange ◽  
Degradation Rate ◽  
Annealing Temperature ◽  
Uv Light ◽  
Dendritic Structure ◽  
Photocatalytic Property ◽  
Average Diameter ◽  
Structure And Morphology ◽  
Air Atmosphere ◽  
Composition Structure

TiO2/VOxnanofibers were synthesized via electrospinning and dipping technologies. They increased the photocatalytic property by reducing the recombination rate of electrons and holes at the surface of TiO2. The composition, structure and morphology were characterized. The effect of annealing temperature to the dendritic structure and their photocatalytic property were demonstrated. The results showed dendritic TiO2/VOxnanofiers were obtained via dipping in vanadium sol, which was annealed at 550°C in 90% Ar/10% H2atmosphere. The average diameter of the samples was 354±42nm. Both the size and the number of dendritic structure were increased as the annealing temperature was rising. The degradation rate of methyl orange (5mg/L) by as-prepared TiO2/VOxnanofibers was 76.4% after exposure under UV light for 120min, which was 25.7% higher than which annealed in air atmosphere.

scholarly journals Facile Hydrothermal Synthesis of SnO2 Nanospheres as Photocatalysts

2017 ◽  
Vol 2017 ◽  
pp. 1-6
Author(s):  
Wenquan Hu ◽  
Xiaoguang Yuan
Keyword(s):  
Methylene Blue ◽  
Methyl Orange ◽  
Organic Dyes ◽  
Uv Light ◽  
Average Diameter ◽  
Potential Candidate ◽  
Wastewater Purification ◽  
Uv Light Irradiation ◽  
Degradation Rates ◽  
Photocatalytic Activities

Large amounts of SnO2 nanospheres are successfully synthesized through a simple and effective hydrothermal method. The as-synthesized products consist of numerous small SnO2 nanocrystals with an average diameter of 40 nm. The as-prepared SnO2 nanospheres are further used as the photocatalysts for photodegrading several organic dyes (methylene blue, methyl orange, Congo red, and rhodamine B) under UV light irradiation. The photocatalytic results show that the as-synthesized SnO2 nanospheres possess high photocatalytic activities. Compared with the degradation rates of other dyes, that of methylene blue reaches 98.5% by 30 min irradiation. It reveals that the as-prepared product might be potential candidate in wastewater purification.

Synergetic Degradation of Enzyme-Fenton Reagent for Methyl Orange

2014 ◽  
Vol 1010-1012 ◽  
pp. 84-87
Author(s):  
Bin Yao ◽  
Zun Mian Xu ◽  
Cheng An Tao ◽  
Jian Fang Wang
Keyword(s):  
Methyl Orange ◽  
Degradation Rate ◽  
Ph Value ◽  
Uv Light ◽  
Degradation Efficiency ◽  
Optimum Conditions ◽  
Fenton Reagent ◽  
Effects Of Ph ◽  
Simulated Wastewater ◽  
Catalytic Effects

The effects of pH adjustment method, pH value, UV light, catalase and Fenton reagent on the degradation efficiency of enzyme-Fenton reagent for methyl orange (MO) were investigated, and the synergetic catalytic effects of catalase and Fenton reagent on the catalytic oxidation for methyl orange were found. When under no UV-light, the enzyme can enhance the degradation efficiency of Fenton reagent. The optimum conditions for degrading methyl orange simulated wastewater whose concentration is 0.1 g/L at room temperature are obtained as follows: the pH is tuned with H2SO4, pH is 3.0, concentration of catalase is 5 μg / mL, concentration of H2O2is 0.01%, concentration of FeSO4is 1.8μmol / L. The degradation rate can reach 98% in 60min. When under UV light at the same condition, the degradation rate can reach 94% in only 15min.

Preparation and Photocatalytic Properties of Magnetic TiO2 Compounds

2011 ◽  
Vol 396-398 ◽  
pp. 306-310
Author(s):  
Li Jun Yan ◽  
Yue Cheng ◽  
Xiao Juan Yan ◽  
Tan Tan Ge
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Intermediate Layer ◽  
Uv Light ◽  
Sol Gel ◽  
Middle Layer ◽  
Negative Influence ◽  
Magnetic Composite ◽  
Composite Photocatalysts ◽  
Composition Structure

In this paper, magnetic composite photocatalysts were prepared through depositing TiO2 on the surface of NiFe2O4 by sol-gel method. The composition, structure and magnetism of the samples are tested by XRD, TEM and VSM, respectively. The photoactivity of the as-prepared photocatalysts was investigated by degrading methyl orange under UV light. The effect of NiFe2O4 and SiO2 intermediate layer on the activity of photocatalyst was also studied. It has been found that NiFe2O4 has a negative influence on the photocatalytic activity of magnetic TiO2 compounds. The middle layer of SiO2 can effectively improve the photocatalytic activity of magnetic TiO2 compounds.

scholarly journals Preparation and Characterization of Porous TiO2 Fibers and Their Photocatalytic Activity

2012 ◽  
Vol 7 (2) ◽  
pp. 155892501200700
Author(s):  
Dawei Gao ◽  
Qingqing Wang ◽  
Hui Qiao ◽  
Yibing Cai ◽  
Fenglin Huang ◽  
...  
Keyword(s):  
Anatase Phase ◽  
Sol Gel ◽  
Homogeneous Solution ◽  
Photocatalytic Property ◽  
Average Diameter ◽  
Tetrabutyl Titanate ◽  
Electrospun Fibers ◽  
Air Atmosphere ◽  
Degradation Of Methyl Orange

TiO2 fibers were successfully prepared by combining electrospinning and calcination processes without using the conventional sol-gel method. Polymethyl methacrylate (PMMA) and tetrabutyl titanate (TBT) were used as TiO2 precursor blended with chloroform to form a homogeneous solution for preparing PMMA/TBT composite fibers. The electrospun fibers were calcinated at 500 °C for 4 h in air atmosphere to obtain TiO2 fibers. XRD, SEM TEM and Brunauer-Emmett-Teller (BET) were used to study structures and morphology of the PMMA/TBT and TiO2 fibers. The photocatalytic property of TiO2 fibers was evaluated by photocatalytic degradation of methyl orange (MeO) under UV irradiation. The results demonstrate that mesoporous TiO2 fibers with larger specific surface area possessing pure anatase phase were successfully prepared and the average diameter of PMMA/TBT fibers decreased from 1.5 μm to 1.0 μm after calcination. The TiO2 fibers show high photocatalytic reactivity in photodegradation of MeO solutions.

Photocatalytic Activity of Titania Nanowire Arrays by Sol-Template Method

2013 ◽  
Vol 423-426 ◽  
pp. 121-124
Author(s):  
Ming Li Li ◽  
Qiong Yu ◽  
Kun Ming Qian ◽  
Yu Song Zhou
Keyword(s):  
Thin Film ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Degradation Rate ◽  
Uv Light ◽  
Glass Plate ◽  
Nanowire Arrays ◽  
Template Method

The template method combined with sol-dipping deposition or sol-electrophoresis was used to prepare titania (TiO2) nanowires with shape of rod or string of beads. When irradiated under ultraviolet (UV) light for 1 hour, the degradation rate of methyl orange (MO) using nanowire arrays reached 98.5% which was 1.84 times as much as that of the thin film on glass plate, and when irradiated under visible light for 6 hours, the degradation rate reached 96.7% which was 4.17 times as much as that of the thin film.

Synthesis of a Carbon-Loaded Bi2O2CO3/TiO2 Photocatalyst with Improved Photocatalytic Degradation of Methyl Orange Dye

2020 ◽  
Vol 20 (12) ◽  
pp. 7653-7658 ◽  
Author(s):  
Kejun Lin ◽  
Jin Qian ◽  
Zehao ZhaO ◽  
Guanglei Wu ◽  
Hongjing Wu
Keyword(s):  
Free Radical ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Degradation Rate ◽  
Average Diameter ◽  
Tio2 Photocatalyst ◽  
Step Method ◽  
Photodegradation Efficiency ◽  
Hydroxyl Free Radical ◽  
Degradation Of Methyl Orange

A microflower-like C/Bi2O2CO3/TiO2 nanocomposite was prepared via a two-step method. Scanning electron microscopy (SEM) showed the sample to have a layered petal-like microstructure consisting of many nanosheets with an average diameter of 2–5 μm, along with activated carbon (AC) or carbon nanotubes (CNTs) and TiO2 nanoparticles deposited on the surface. Compared with pure Bi2O2CO3, Bi2O2CO3/TiO2 photocatalyst loaded with microflower-like carbon has a good degradation rate of methyl orange (MO) under visible light (0.019 min−1). The highest photodegradation efficiency of MO by AC or CNT-loaded Bi2O2CO3/TiO2 microflowers reached a maximum of 95% degradation after 180 minutes of reaction. The results show that the photocatalytic reaction of the hole and the hydroxyl free radical groups were important for the process of the photocatalytic degradation, and the effect of the hole was slightly greater than that of the hydroxyl free radical. After comparing the different photocatalysts, it showed that C and TiO2 could improve the photocatalytic activity of Bi2O2CO3-based photocatalysts.

Synthesis and Photocatalytic Property of Cu3V2O8 Prepared by Liquid Phase Precipitation

2011 ◽  
Vol 236-238 ◽  
pp. 1675-1678 ◽  
Author(s):  
Min Wang ◽  
Qiong Liu
Keyword(s):  
Methyl Orange ◽  
Liquid Phase ◽  
Uv Light ◽  
Photocatalytic Property ◽  
Precipitation Method ◽  
Phase Precipitation ◽  
Powder Preparation ◽  
Photocatalytic Decolorization ◽  
Powder Suspension

Cu3V2O8powder was prepared by the liquid phase precipitation method and characterized using XRD , SEM and BET. The photocatalytic decolorization of methyl orange in Cu3V2O8powder suspension was investigated using 20w UV light as light source．The result shows that the the liquid-phase precipitation method is a simple and effective method for Cu3V2O8powder preparation. It was found that the sample prepared with the n(V)/n(Cu)moral ratio be 2/3, pH=7 and calcinated under 750°C for 4 hours was pure triclinc Cu3V2O8phase.

Comparative investigation on the removal of methyl orange from aqueous solution using three different advanced oxidation processes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Zahia Benredjem ◽  
Karima Barbari ◽  
Imene Chaabna ◽  
Samia Saaidia ◽  
Abdelhak Djemel ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Current Density ◽  
Advanced Oxidation Processes ◽  
Degradation Rate ◽  
Supporting Electrolyte ◽  
Advanced Oxidation ◽  
Comparative Investigation ◽  
Oxidation Processes ◽  
The Comparative Study ◽  
Kinetics Of

Abstract The Advanced Oxidation Processes (AOPs) are promising environmentally friendly technologies for the treatment of wastewater containing organic pollutants in general and particularly dyes. The aim of this work is to determine which of the AOP processes based on the Fenton reaction is more effective in degrading the methyl orange (MO) dye. The comparative study of the Fenton, photo-Fenton (PF) and electro-Fenton (EF) processes has shown that electro-Fenton is the most efficient method for oxidizing Methyl Orange. The evolution of organic matter degradation was followed by absorbance (discoloration) and COD (mineralization) measurements. The kinetics of the MO degradation by the electro-Fenton process is very rapid and the OM degradation rate reached 90.87% after 5 min. The influence of some parameters such as the concentration of the catalyst (Fe (II)), the concentration of MO, the current density, the nature and the concentration of supporting electrolyte was investigated. The results showed that the degradation rate increases with the increase in the applied current density and the concentration of the supporting electrolyte. The study of the concentration effect on the rate degradation revealed optimal values for the concentrations 2.10−5 M and 75 mg L−1 of Fe (II) and MO respectively.

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