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.

Study on the Treatment of Dye Wasterwater Using Fenton Reagent

2012 ◽  
Vol 518-523 ◽  
pp. 3204-3207 ◽  
Author(s):  
Hui Tian ◽  
Ya Na Liu
Keyword(s):  
Degradation Rate ◽  
Ph Value ◽  
Removal Rate ◽  
Methyl Violet ◽  
Ion Concentration ◽  
Fenton Reagent ◽  
Research Subjects ◽  
Ferrous Ions ◽  
Alizarin Red ◽  
Main Research

The methyl violet dye as the main research subjects. The concentration of H2O2, ferrous ion concentration, pH value and the type of dyes and so on be research the influence on the rate. The result shown: the greater dose of H2O2, the greater removal of methyl violet dye. when the dose of H2O2reach to a certain amount, keep increase the dose , but the increase was not obvious. In a certain concentration range, when the higher concentration of ferrous ions, the higher degradation rate of methyl viologen.When more than the certain concentration, the degradation rate began to decline. The removal efficiency is better when the ratio of ferrous ions and H2O2is 1:10..A large removal rate is controlled in the temperature of 20 to 60 as well as the pH is from 3 to 5. After changing the type of dye,beside the Alizarin Red,the removal of Methylene blue, Rhodamine, methyl violet are all high.

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.

Study of Degradation of Phenol by Fenton Reagent under Sunlight

2012 ◽  
Vol 610-613 ◽  
pp. 1364-1367
Author(s):  
Sheng Tao Jiang ◽  
Xiao Chen ◽  
Wei Su ◽  
Tian Fei Tang
Keyword(s):  
Visible Light ◽  
Ph Value ◽  
Phenol Degradation ◽  
Inhibitory Effect ◽  
Sodium Oxalate ◽  
Optimum Conditions ◽  
Fenton Reagent ◽  
Initial Phenol Concentration ◽  
High Concentrations ◽  
Phenol Wastewater

Degradation of phenol was studied in the presence of Fenton Reagent. The initial concentrations of C2O42, H2O2 , Fe2 + and pH value on the reaction were investigated. The optimum conditions to degrade phenol from water were determined when initial phenol concentration was 500mg/L, the concentration of Na2C2O4, H2O2 and Fe2 + were 0mmol/L, 300mg/L and 60mg/ L respectively, and pH value was 3. Under the optimum conditions, phenol degradation and mineralization rates could reach 80% and 50%, respectively when the degrade time lasted 10 min.Reference to other literature of sodium oxalate to join can effectively improve the utilization of the ultraviolet and visible light,thus enhancing the effect of high concentrations of phenol wastewater removal, but this experiment reflects the high C2O42- will play an inhibitory effect .

scholarly journals Excellent UV-Light Triggered Photocatalytic Performance of ZnO.SiO2 Nanocomposite for Water Pollutant Compound Methyl Orange Dye

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2548
Author(s):  
Sunil Rohilla ◽  
Ankita Gupta ◽  
Vibhor Kumar ◽  
Suman Kumari ◽  
Michal Petru ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Ph Value ◽  
Uv Light ◽  
Irradiation Time ◽  
Diffraction Method ◽  
Hexagonal Structure ◽  
Precipitation Method ◽  
Photo Degradation ◽  
Systematic Analysis ◽  
Degradation Ability

The photocatalytic activity of eco-friendly zinc oxide doped silica nanocomposites, synthesized via a co-precipitation method followed by heat-treatment at 300, 600, and 900 °C is investigated. The samples have been characterized by employing X-ray diffraction method, and further analyzed using the Rietveld Refinement method. The samples show a space group P63mc with hexagonal structure. The prepared composites are tested for their photocatalytic activities for the degradation of methyl orange-based water pollutants under ultra-violet (UV) irradiation using a 125 W mercury lamp. A systematic analysis of parameters such as the irradiation time, pH value, annealing temperatures, and the concentration of sodium hydroxide impacting the degradation of the methyl orange (MO) is carried out using UV-visible spectroscopy. The ZnO.SiO2 nanocomposite annealed at 300 °C at a pH value of seven shows a maximum photo-degradation ability (~98.1%) towards methyl orange, while the photo-degradation ability of ZnO.SiO2 nanocomposites decreases with annealing temperature (i.e., for 600 and 900 °C) due to the aspect ratio. Moreover, it is seen that with increment in the concentration of the NaOH (i.e., from 1 to 3 g), the photo-degradation of the dye component is enhanced from 20.9 to 53.8%, whereas a reverse trend of degradation ability is observed for higher concentrations.

Study on the treatment of simulated azo dye wastewater by a novel micro-electrolysis filler

2019 ◽  
Vol 79 (12) ◽  
pp. 2279-2288 ◽  
Author(s):  
Zhen-Zhu Sun ◽  
Zhong-Hai Liu ◽  
Le Han ◽  
Dong-Ling Qin ◽  
Gang Yang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Methyl Orange ◽  
Degradation Rate ◽  
Ph Value ◽  
Aeration Rate ◽  
Layer By Layer ◽  
Dye Wastewater ◽  
Operational Parameters ◽  
Initial Ph ◽  
New Type

Abstract A new type of iron-copper-carbon (Fe-Cu-C) ternary micro-electrolysis filler was prepared with a certain proportion of iron powder, activated carbon, bentonite, copper powder, etc. The effect of the new type of micro-electrolysis filler on the simulated methyl orange dye wastewater was studied. The effects of various operational parameters, such as reaction time, initial pH value, aeration rate, filler dose and reaction temperature, on the degradation rate of methyl orange were studied to determine the optimum treatment conditions, and the micro-electrolysis filler was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The experimental results show that the degradation rate of 220 mL of simulated dye wastewater with a concentration of 100 mg/L reached 93.41% ± 2.94% after 60 mL/min of aeration, with an initial pH = 2, a dose of 45 g and 125 minutes of reaction at room temperature. The new micro-electrolysis filler has a high degradation rate for methyl orange solution, which is attributed to the iron and activated carbon particles sintered into an integrated structure, which makes the iron and carbon difficult to separate and affects the galvanic cell reaction. The addition of copper also greatly increases the transmission efficiency of electrons, which promotes the reaction. In addition, the surface iron is consumed, the adjacent carbon is stripped layer by layer, and the new micro-electrolytic filler does not easily passivate and agglomerate during its use.

Landfill leachate treatment by a photoassisted fenton reaction

1997 ◽  
Vol 35 (4) ◽  
pp. 239-248 ◽  
Author(s):  
Soo-M. Kim ◽  
Sven-U. Geissen ◽  
Alfons Vogelpohl
Keyword(s):  
Landfill Leachate ◽  
Radiation Intensity ◽  
Fenton Reaction ◽  
Energy Input ◽  
Degradation Rate ◽  
Ph Value ◽  
Uv Light ◽  
Molar Ratio ◽  
Leachate Treatment ◽  
Specific Energy Input

A combination of the classical Fenton reaction (Fe(II)+H2O2) with UV light, the photoassisted Fenton reaction, has been investigated for the treatment of landfill leachate. The investigation has been carried out with an experimental set-up to establish the optimal treatment conditions. The degradation rate of organic pollutants is strongly promoted by the photoassisted Fenton reaction. The degradation rate depends on the amount of H2O2 and Fe(II) added, pH value, and radiation intensity. At a specific energy input of 80 kW m−3 the oxidation rate was increased to six times the rate without radiation (0 kW m−3). At the higher radiation intensity of 160 kW m−3 the degradation rate was about two times faster than at that of 80 kW m−3. Due to the regeneration of the consumed Fe(II) ions through the irradiation, the amount of ferrous salt to be added can be remarkably reduced. The optimum conditions were obtained with 1.0 × 10−3 mol 1−1 Fe(II) added, a pH value of 3, and a molar ratio of COD: H2O2 = 1:1. At a COD volume loading of less than 0.6 kg m−3 h−1, a COD degradation of more than 70% could be obtained with an energy input of 80 kW m−3.

Photo-Catalytic Properties of Ceramic Coating of TiO2

2007 ◽  
Vol 336-338 ◽  
pp. 1901-1903
Author(s):  
Hai Yang Li ◽  
Zhong Kuang Luo ◽  
Hong Hua Cai ◽  
Jian Hong Liu ◽  
Pei Xin Zhang ◽  
...  
Keyword(s):  
Degradation Rate ◽  
Ceramic Coating ◽  
Catalytic Properties ◽  
Uv Light ◽  
Silica Sol ◽  
The Other ◽  
Initial Concentration ◽  
Heat Treated ◽  
Catalytic Effects ◽  
Degradation Effect

TiO2 coatings on ceramic substrate were prepared using TiOSO4 and silica sol. Coatings were then heat-treated respectively at 300°C, 400°C or 500°C for 30mins. Degradation of the solution of chlorinated methane by UV light and TiO2 coating were investigated. It can be concluded from the results that the coating with composition of 80wt%TiO2-20wt%SiO2 heated at 500°C display better degradation effect than the other coatings. As the initial concentration of chloromethane goes up, the degradation rate increases; while as the degree of substitution by chlorine goes up, the catalytic effects decreases.

Photocatalytic Activity of Solar-Light-Active N-Doped TiO2 by Sol-Gel Combustion Method

2014 ◽  
Vol 809-810 ◽  
pp. 800-806
Author(s):  
Xian Du ◽  
Hui Ling Du ◽  
Xiang Shi ◽  
Jin Wang ◽  
Jiao Jiao He
Keyword(s):  
Methyl Orange ◽  
Degradation Rate ◽  
Ph Value ◽  
Dye Degradation ◽  
Sol Gel ◽  
Light Irradiation ◽  
Solar Light ◽  
Tetrabutyl Titanate ◽  
Solar Light Irradiation ◽  
Gel Combustion

The present work was dedicated to the tailored synthesis of TiO2nanopowders doped with nitrogen (called TiO2−xNx) for the photocatalytic degradation of methyl orange. In particular, the systems were synthesized by a sol-gel combustion route starting from nitric acid and tetrabutyl titanate (Ti (OC4H9)4) as raw materials. The powders were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), suggesting that anatase phase is obtained at pH value of 4-6 and the heat-treated temperatures as low as 425°C. The photocatalytic activities of the N-doped TiO2nanopowders were monitored from the results of the degradation rate of methyl orange (MO) under solar light irradiation. The dependence of dye degradation rate on photocatalyst amount and initial pH was investigated. Under solar light irradiation, the TiO2doped with 30% N exhibited the highest photocatalytic reactivity, which could be attributed to the structure of the combustion-synthesized catalyst and the change of the bandgap induced by nitrogen inclusion.

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.

Influences of Aeration and pH on Activities of HZSM-5 Supported TiO2

2012 ◽  
Vol 424-425 ◽  
pp. 990-993
Author(s):  
Feng Qi Li ◽  
Wen Jie Zhang
Keyword(s):  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Flow Rate ◽  
Degradation Rate ◽  
Ph Value ◽  
Air Flow ◽  
Methyl Orange Solution ◽  
Air Flow Rate ◽  
Methyl Orange Degradation ◽  
Orange Solution

Aeration and pH of methyl orange solution were adjusted to investigate the influences on photocatalytic degradation activities of TiO2/HZSM-5. Degradation rate was enhanced when applying air into the solution. When air flow rate increased from 0 to 150 ml/l, methyl orange degradation rate increased from 47% to 55%. Further increase of air flow rate had nearly no influence on degradation rate. Degradation rate performed strong dependence on pH value of methyl orange solution. Acidic situation was favorable for methyl orange degradation, whereas methyl orange degradation in basic situation was comparatively weak. Photocatalytic degradation of methyl orange decreased with increasing of pH value.

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