Photoelectrocatalytic Oxidation of Methyl Orange in KCI Solution

2012 ◽  
Vol 424-425 ◽  
pp. 981-984
Author(s):  
Feng Qi Li ◽  
Wen Jie Zhang
Keyword(s):  
Methyl Orange ◽  
Degradation Rate ◽  
Irradiation Time ◽  
Potential Range ◽  
Applied Potential ◽  
Methyl Orange Degradation ◽  
Photoelectrocatalytic Oxidation ◽  
Prolonged Irradiation ◽  
Degradation Rates

When potential was less than 1.2 V, electro-degradation rate was not more than 1.2% on both the films prepared using PEG or not. The film prepared with addition of PEG showed better degradation rates in the whole potential range than the film prepared without using of PEG. The highest degradation rates existed at 1.1 V of applied potential for both of the film electrodes, where degradation rate on film with PEG was 93.6% and the rate was 92.2% on the film without PEG. Methyl orange degradation rates increased with increasing KCl concentration from 0 to 0.7 mol/l, while degradation rates dropped down at even higher potential. Degradation rates increased with prolonged irradiation time for both of the two film electrodes.

Photoelectrocatalytic Oxidation of Methyl Orange in KNO3 Solution

2012 ◽  
Vol 424-425 ◽  
pp. 1044-1047
Author(s):  
Ying Tao Song ◽  
Wen Jie Zhang
Keyword(s):  
Methyl Orange ◽  
Degradation Rate ◽  
Potential Range ◽  
Methyl Orange Degradation ◽  
Photoelectrocatalytic Oxidation ◽  
Degradation Rates

Photoelectrocatalytic oxidation of methyl orange on TiO2 films were investigated in KNO3 solution. In the potential range up to 1.2 V, electro-degradation rates were fairly low that was less than 1%. Degradation rates on the two films were larger at higher potentials. The film prepared without PEG showed better activities than the film prepared with PEG during the whole range of potential. Methyl orange degradation rate increased with increasing KNO3 concentration from 0 to 0.010 mol/l. After 120 min of irradiation, methyl orange degradation rate on the film with PEG was 89.5%, while degradation rate on the film without PEG was 92.0% after the same period.

Porous TiO2 Film Electrode Used for Photoelectrocatalytic Degradation of Methyl Orange in NaHCO3 Solution

2011 ◽  
Vol 230-232 ◽  
pp. 126-130
Author(s):  
Wen Jie Zhang ◽  
Ke Xin Li
Keyword(s):  
Methyl Orange ◽  
Degradation Rate ◽  
Sol Gel ◽  
Applied Potential ◽  
Methyl Orange Degradation ◽  
Photoelectrocatalytic Degradation ◽  
Degradation Rates ◽  
Negative Effect ◽  
Optimal Values ◽  
Degradation Of Methyl Orange

PEG1000 was used as template to prepare porous TiO2 film by sol-gel method. The functions of applied potential and concentration of NaHCO3 to the photoelectrocatalytic degradation of methyl orange on porous and smooth TiO2 films were investigated. Methyl orange degradation rate has two optimal values at the applied potential of 0.8 V and 1.8 V. The addition of PEG may have negative effect on photoelectrocatalytic activity of TiO2 film. The degradation rate increases with increasing NaHCO3 concentration from 0 up to 0.05 mol/l, and then it declines after further increase of electrolyte concentration. After 100 min of reaction, the degradation rates on the films prepared without and with PEG addition are 63.78% and 65.22%, respectively.

Electro-Assisted Photocatalytic Degradation of Methyl Orange on TiO2 Film Using CaСl2 as Electrolyte

2012 ◽  
Vol 487 ◽  
pp. 635-639
Author(s):  
Wen Jie Zhang ◽  
Hong Liang Xin ◽  
Hong Bo He
Keyword(s):  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Tio2 Film ◽  
Sol Gel ◽  
Degradation Process ◽  
Applied Potential ◽  
Methyl Orange Degradation ◽  
Degradation Rates ◽  
Smooth Film ◽  
Better Than

Porous and smooth TiO2 film electrodes prepared by sol-gel method were used on methyl orange degradation by an electro-assisted photocatalytic degradation process. Methyl orange cannot be degraded under applied potential solely below 2.0 V. When the applied potential was below 1.3 V, methyl orange degradation rates on porous TiO2 film increased from 5% at 0 V to 65.3% at 1.3 V, and degradation rates on smooth TiO2 film changed from 2.2% at 0 V to 61.1% at 1.3 V. Electro-assisted photocatalytic degradation rate on porous film was better than that on smooth film in the whole electrolyte concentration range. Electro-assisted degradation exhibited the same rising trend along with reaction time on the porous and smooth films.

Co-Sol-Gel Preparation of SiO2-Doped TiO2 on Adsorption and Photocatalytic Degradation of Methyl Orange

2011 ◽  
Vol 48-49 ◽  
pp. 345-348
Author(s):  
Li Li Yang ◽  
Yan Liang Qu ◽  
Wen Jie Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Adsorption Equilibrium ◽  
Irradiation Time ◽  
Sol Gel ◽  
Methyl Orange Degradation ◽  
Doped Tio2 ◽  
Degradation Rates ◽  
Gel Preparation ◽  
Degradation Of Methyl Orange

A co-sol-gel method was used to prepare SiO2-doped TiO2. The amount of ethyl silicate added into the precursor, calcination temperature and time, adsorption equilibrium, and photocatalytic activity of the material were investigated as the factor of degradation efficiency. With the optimum composition of the precursor, the prepared gel calcinated at 500 oC for 3 h showed the highest photocatalytic activity. After 30 min stirring to reach adsorption equilibrium, adsorption contributed less than 2% to the total decoloration of methyl orange on the SiO2-doped TiO2 material. Photocatalytic methyl orange degradation continued with increasing irradiation time. Methyl orange degradation rates after 30 min and 100 min were 31.1% and 96.9%, respectively.

Photoelectrocatalytic Oxidation of Methyl Orange in KHCO3 Solution

2012 ◽  
Vol 485 ◽  
pp. 64-67
Author(s):  
Wen Jie Zhang ◽  
Na Yu
Keyword(s):  
Methyl Orange ◽  
Sharp Increase ◽  
Electrolyte Concentration ◽  
Potential Range ◽  
Photoelectrocatalytic Oxidation ◽  
Total Potential ◽  
Degradation Rates ◽  
Key Factor ◽  
Degradation Activity ◽  
Better Than

Photoelectrocatalytic oxidation of methyl orange on TiO2 films were investigated in KHCO3 solution. Electro-degradation alone could degrade little methyl orange in the solution. The film electrode prepared using PEG had less activity than the film without PEG. In the potential range from 0 to 1.3 V, degradation rate on film without PEG increased slowly until a sharp increase at potential of 1.2 V. Electrolyte concentration in the solution is not a key factor influencing degradation activity since the total potential was not high. With increasing reaction time, degradation rates on the two film electrodes increased at the same time, while the electrode prepared without PEG performed better than the electrode prepared with PEG.

scholarly journals The Role of H2C2O4 and Na2CO3 as Precipitating Agents on The Physichochemical Properties and Photocatalytic Activity of Bismuth Oxide

2020 ◽  
Vol 18 (1) ◽  
pp. 129-137
Author(s):  
Yayuk Astuti ◽  
Rizka Andianingrum ◽  
Abdul Haris ◽  
Adi Darmawan ◽  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Physicochemical Properties ◽  
Bismuth Oxide ◽  
Rate Constants ◽  
Degradation Rate ◽  
Precipitation Method ◽  
Methyl Orange Degradation ◽  
Methyl Orange Dye

AbstractSynthesis of bismuth oxide synthesis through the precipitation method using H2C2O4 and Na2CO3 precipitating agents, identification of physicochemical properties and its photocatalysis activity for methyl orange degradation were conducted. The bismuth oxide synthesis was undertaken by dissolving Bi(NO3)3.5H2O in HNO3, then added precipitating agents to form precipitate. The results showed that bismuth oxide produced by H2C2O4 precipitating agent was a yellow powder containing a mixture of α-Bi2O3 (monoclinic) and β-Bi2O3 (tetragonal), porous with size of 28-85 μm. Meanwhile, the use of Na2CO3 as precipitating agent resulted in bismuth oxide consisting of α-Bi2O3 and β-Bi2O3 and Bi2O4, irregular shape without pore being 40-115 μm in size. Bismuth oxide synthesized with H2C2O4 precipitating agent showed higher photocatalytic activity compared to bismuth oxide synthesized using Na2CO3 on degrading methyl orange dye with degradation rate constants of 2.35x10-5 s-1 for H2C2O4 and 1.81x10-5 s-1 for Na2CO3.

Photoelectrocatalytic Properties of Porous TiO2 Films Prepared Using ODA as Template

2012 ◽  
Vol 457-458 ◽  
pp. 521-524 ◽  
Author(s):  
Wen Jie Zhang ◽  
Qian Li ◽  
Hong Bo He
Keyword(s):  
Reaction Time ◽  
Methyl Orange ◽  
Degradation Rate ◽  
Synergetic Effect ◽  
Degradation Process ◽  
Absorption Peak ◽  
Photocatalytic Process ◽  
Applied Potential ◽  
Peak Intensity ◽  
Photoelectrocatalytic Degradation

The functions of applied potential to the photoelectrocatalytic degradation process of methyl orange were investigated. When using 0.05 M NaCl and under different applied potentials, the degradation rate increased obviously with increasing applied potential. When the applied potential was between 0.6 V-1.0 V, the degradation rate was enhanced drastically. The detected current values got larger as the applied potential increased from 0 up to 1.2 V. There was no direct electro-degradation to the dye in the solution. The applied potential and the irradiated light had synergetic effect when they were applied to the solution at the same time. While after irradiation for 0 to 60 min, with the increasing reaction time, methyl orange absorption peak intensity shrank obviously. The azo and benzene groups in methyl orange degraded totally under photocatalytic process.

Synthesis, Characterization and Photocatalytic Properties of CdS Nanorods

2012 ◽  
Vol 535-537 ◽  
pp. 264-267 ◽  
Author(s):  
Li Juan Xie ◽  
Li Mei Duan ◽  
Ling Xu ◽  
Yin Wang ◽  
Xiao Lei Wang ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Methyl Orange ◽  
Uv Irradiation ◽  
Degradation Rate ◽  
Raw Material ◽  
Cadmium Nitrate ◽  
Solution Ph ◽  
Methyl Orange Degradation ◽  
Diethylene Triamine ◽  
Cds Nanorods

CdS Nanorods have been successfully prepared by hydrothermal synthesis technology by using cadmium nitrate and thiourea as the raw material,by using diethylene triamine as the template agent. The samples were characterized by the technique of XRD、TEM and SEM. The results indicated that the products were pure hexagonal CdS. This paper also used the samples as photocatalysts to study the degradation the solution of methyl orange. The concentration of methyl orange was unchanged during the process of experiment. We also investigated the effect of the amount of catalyst, and pH of the solution on the degradation rate of methyl orange. The experimental results showed that methyl orange degradation rate reached 90% with the amount of catalyst 0.020 g, solution pH of 3.5 and UV irradiation 120 min.

Photocatalytic Methyl Orange Degradation on TiO2-NaX Composite

2010 ◽  
Vol 129-131 ◽  
pp. 804-807
Author(s):  
Hong Wang ◽  
Yang Yu ◽  
Wen Jie Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Solid State ◽  
Degradation Rate ◽  
Pure Tio2 ◽  
Methyl Orange Degradation ◽  
Maximum Value ◽  
Photocatalytic Activities ◽  
Addition Amount ◽  
Better Than

Photocatalytic activities of simple mixture of TiO2 and NaX, and TiO2-NaX composite prepared by solid-state dispersion method were investigated. Methyl orange degradation rate increased sharply when TiO2 concentration was low and reached its maximum value at TiO2 concentration of 200 mg/l when using pure TiO2. After 120 min of irradiation, methyl orange degradation rate could reach 98.4%, which means nearly all of the dye degraded after two hours. The photocatalytic activity of TiO2 and NaX simple mixture increased with increasing amount of NaX up to 60.4% when NaX amount was 1.4 g/l. The composite TiO2-NaX prepared by grinding had lower activity at various NaX addition amount. The photocatalytic activity of composite TiO2-NaX prepared by solid-state dispersion was better than the composite before calcination. However, the maximum degradation rate was only 41.2%, which was still lower than pure TiO2.

Cosolvent-free nanocasting synthesis of ordered mesoporous g-C3N4 and its remarkable photocatalytic activity for methyl orange degradation

RSC Advances ◽  
2015 ◽  
Vol 5 (94) ◽  
pp. 76963-76972 ◽  
Author(s):  
Xiaochun Gao ◽  
Xuejiao Jiao ◽  
Lanchun Zhang ◽  
Wencai Zhu ◽  
Xiaohong Xu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Rate Constant ◽  
Degradation Rate ◽  
Methyl Orange Degradation ◽  
Ordered Mesoporous ◽  
Degradation Rate Constant ◽  
Nanocasting Route

Ordered mesoporous g-C3N4, synthesized via a green cosolvent-free nanocasting route, exhibited remarkable photodegradation performance towards methyl orange with a degradation rate constant 30 times higher than that of bulk g-C3N4.

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