Photoelectrocatalytic Degradation of Methyl Orange Using Suspended TiO2 and the Effects of Ammonium Salts

2010 ◽  
Vol 26-28 ◽  
pp. 489-492
Author(s):  
Xuan Xiao ◽  
Jia Wei Bai ◽  
Wen Jie Zhang ◽  
Yuan Di Li
Keyword(s):  
Methyl Orange ◽  
Composite System ◽  
Electrolyte Concentration ◽  
Ammonium Salts ◽  
Photocatalytic Process ◽  
Applied Potential ◽  
Photoelectrocatalytic Degradation ◽  
Noticeable Improvement ◽  
Nh4cl Solution ◽  
Degradation Of Methyl Orange

Photoelectrocatalytic (PEC) degradation efficiencies of a suspended TiO2 and Ti electrodes composite system in different ammonium salt solutions were investigated. Electrolyte type and concentration as well as the applied potential on the Ti electrodes had significant effects on photoelectrocatalytic degradation and electro-degradation efficiencies. PEC degradation and electro-degradation of methyl orange increased with increasing applied potential and electrolyte concentration. PEC degradation is much more powerful than electro-degradation. PEC degradation efficiency in (NH4)3PO4•3H2O solution is the highest 93.4%, whereas the efficiency in NH4Cl solution shows the worst 73.1%, which is even less than that of photocatalytic process alone. PEC degradation efficiencies in (NH4)2SO4 and NH4HCO3 solutions are 88.8% and 85.9% respectively, indicating no noticeable improvement compared with photocatalytic process.

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.

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.

Bias potential role in degradation of methyl orange in photocatalytic process

2018 ◽  
Vol 360 ◽  
pp. 196-203 ◽  
Author(s):  
Mohammadali Seifhosseini ◽  
Fariborz Rashidi ◽  
Mohammad Rezaei ◽  
Neshat Rahimpour
Keyword(s):  
Methyl Orange ◽  
Potential Role ◽  
Photocatalytic Process ◽  
Bias Potential ◽  
Degradation Of Methyl Orange

Photosensitization of Nitrogen Doped TiO2 Nanoparticles with Na-Chlorophyllin Copper for Degradation of Methyl Orange

2011 ◽  
Vol 343-344 ◽  
pp. 216-221
Author(s):  
Jian Yu Gong ◽  
Chang Zhu Yang ◽  
Wen Hong Pu ◽  
Jing Dong Zhang
Keyword(s):  
Methyl Orange ◽  
Visible Light ◽  
Light Illumination ◽  
Nitrogen Doped ◽  
Photoelectrocatalytic Degradation ◽  
Visible Light Illumination ◽  
Doped Titanium Dioxide ◽  
Degradation Properties ◽  
Degradation Of Methyl Orange ◽  
Nitrogen Doped Titanium Dioxide

Nitrogen doped titanium dioxide nanoparticals (N-TiO2) were prepared by the sol-hydrothermal method using urea as N sources. SEM showed the sphericity of as-prepared nanoparticals. XRD indicated that N-TiO2 was anatase crystal after thermal treatment. While Na-chlorophyllin copper (Na-chl-Cu) was used as to sensitize the N-TiO2, the photocurrent of Na-chl-Cu/N-TiO2 was 50 ìA double than that of N-TiO2 under visible light illumination. Thus, the visible light photoelectrocatalytic degradation properties of Na-chl-Cu/N-TiO2 were investigated using methyl orange (MO) as the objective pollution. When 1.8 V anodic bias potential and visible light were simultaneously applied, the highest degradation efficiency of MO over the Na-chl-Cu/N-TiO2 was obtained.

scholarly journals A Simple g-C3N4/TNTs Heterojunction for Improving the Photoelectrocatalytic Degradation of Methyl Orange

2021 ◽  
Author(s):  
Linsheng Zeng ◽  
Zichun He ◽  
Yongping Luo ◽  
Jitao Xu ◽  
Jiansheng Chen ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Carbon Nitride ◽  
Degradation Rate ◽  
Nanotube Arrays ◽  
Photoelectrocatalytic Degradation ◽  
Titanium Dioxide Nanotube Arrays ◽  
Anodic Oxidation Method ◽  
Degradation Properties ◽  
Degradation Of Methyl Orange ◽  
Effect Of Light

Abstract In this work, highly ordered titanium dioxide nanotube arrays (TNTs) were first prepared by anodic oxidation method. Then, g-C3N4/TNTs heterojunctions were prepared by ultrasonically loading graphitic carbon nitride (g-C3N4) onto the TNTs. The morphology and crystal structure of TNTs and g-C3N4/TNTs were characterized by SEM and XRD. The photoelectrocatalytic (PEC) degradation of methyl orange (MO) by TNTs and g-C3N4/TNTs was studied in a PEC degradation system. The photocatalytic (PC), electrocatalytic (EC), and PEC degradation properties were compared, and the effect of pollutant concentration on the degradation performance of the catalysts was analyzed. According to the experimental results, the degradation rate of MO with TNTs only reaches 65.1% after 120 min, while the degradation rate of MO with g-C3N4/TNTs reaches 84.6% in the same time. Due to the synergistic effect of light and electricity, the PEC degradation efficiency of the two catalysts is greater than the sum of PC and EC degradation, proving that g-C3N4/TNTs heterojunctions provide excellent PEC performance for the degradation of MO.

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