scholarly journals Degradation of aniline in water with gaseous streamer corona plasma

2021 ◽  
Vol 8 (4) ◽  
Author(s):  
Yang Li ◽  
Zhanguo Li ◽  
Zhen Liu ◽  
Shitong Han ◽  
Sanping Zhao ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Intermediate Product ◽  
Water Surface ◽  
Degradation Rate ◽  
Ph Value ◽  
Initial Concentration ◽  
Corona Plasma ◽  
Active Particles ◽  
Streamer Corona ◽  
Air Discharge

This paper demonstrated the effects and influencing factors in degrading aniline by gaseous streamer corona plasma along water surface under different discharging gas atmospheres. For aniline with an initial concentration of 100 mg l −1 , the degradation was fastest when the reactor was not ventilated, and the degradation rate is 98.5% under 7.5 min treatment. While the degradation was slowest when Ar was ventilated, the degradation rate is 98.6% after treatment for 60 min. Some active particles were detected using a multi-channel fibre-optic spectrometer during the discharge, such as Ar, OH, N 2 , N 2 + and N. In particular, NO was detected during air discharge. The NO and N 2 + could produce NO 3 − ; then generated nitric acid would affect the pH value of the solution. The intermediate product by N 2 discharge is nitrophenol, and nitrophenol would be converted to p -benzoquinone. The O 2 discharge could produce an intermediate product of aminophenol. The intermediate products in Ar discharge were in small amounts and the final mineralization effect was the best.

Study on UV/O3 of Methyl Violet Wastewater

2012 ◽  
Vol 518-523 ◽  
pp. 3208-3211
Author(s):  
Ya Na Liu ◽  
Hui Tian ◽  
An Heng Si
Keyword(s):  
Free Radicals ◽  
Degradation Rate ◽  
Ph Value ◽  
Methyl Violet ◽  
Research Process ◽  
Solution Ph ◽  
Initial Concentration ◽  
First Order ◽  
Alkaline Conditions ◽  
Degradation Reaction

Ultraviolet ozone process was used to eliminate Methyl Violet, the effects of the type of research process, the initial solution pH, dye concentration and free radical quenching agent N-butanol on its degradation rate were studied. The experimental results showed that: comparing to UV, O3, UV/O3 three types of technology, UV and O3 technology had significant synergies, the degradation rate of Methyl Violet solution achieve 99.58% at 50min for the initial concentration of 100mg/L. increasing pH value resulted in increasing degradation rate, the degradation rate achieved 99. 8% at 50min under alkaline conditions. The remove rate decreased with increasing initial concentrations. Quenchers of free radicals inhibited the generation of hydroxyl radical and induced decreasing degradation rate. The degradation reaction of Methyl Violet by UV/O3 followed first-order law.

Azo Dye-Yellow 17 Wastewater Photocatalytic Degradation of by UV/TiO2 Combined with Ultrasonic Procedure

2010 ◽  
Vol 123-125 ◽  
pp. 11-14 ◽  
Author(s):  
Chen Yu Chang ◽  
Yu Jie Chang ◽  
Yung Hsu Hsieh ◽  
Ching Hsing Lin ◽  
Shih Hung Yen
Keyword(s):  
Hydrogen Peroxide ◽  
Azo Dye ◽  
Degradation Rate ◽  
Ph Value ◽  
Dye Wastewater ◽  
Treatment Efficiency ◽  
Initial Concentration ◽  
Initial Adsorption ◽  
Significant Additive Effect ◽  
Fe Ions

. The study combined UV/TiO2 with ultrasonic procedure to degrade azo dye wastewater of Acid Yellow 17. The effects of factors including pH value, initial concentration of dye, and quantities of TiO2, Fe (II), and Fe (III) added on the removal efficiency of azo dye Acid Yellow 17 were investigated. Experimental results revealed significant additive effect attributed to the combination of two procedures under 13-watt UV irradiation and 10-watt ultrasound. Analysis of the catalyst properties indicated no evident changes in the appearance of crystal and TiO2 catalyst by UV/TiO2 combined with ultrasonic procedure. However, the specific surface area was increased by approximately 53%. No effective formation of hydrogen peroxide (ND  1 mg/L) proved that the addition of Fe (II) and Fe (III) failed to induce the Fenton-like reaction effectively. Nevertheless, the addition of Fe ions affected significantly the initial adsorption and the degradation rate of the dye. Moreover, the treatment efficiency of Fe (III) was found to be superior to that of Fe (II) under the same concentration.

Photocatalytic Treatment of MO in Water with BiOBr Photocatalyst

2011 ◽  
Vol 694 ◽  
pp. 554-558 ◽  
Author(s):  
Xiao Xia Zhao ◽  
Yan Wang ◽  
Zhu Qing Shi ◽  
Cai Mei Fan
Keyword(s):  
Degradation Rate ◽  
Ph Value ◽  
Degradation Process ◽  
Xenon Lamp ◽  
Experimental Conditions ◽  
Initial Concentration ◽  
X Ray ◽  
Hydrolysis Method ◽  
Methylene Orange ◽  
Initial Ph

The BiOBr catalyst prepared by the hydrolysis method was investigated with the X-ray diffractometry(XRD) and scanning electron microscope (SEM). The results show that the catalyst was the tetragonal primitive crystal structure and composed of homogeneous particles of fine ferrite plates. At the same time, the photocatalytic activity of BiOBr catalyst was evaluated by methylene orange (MO) in aqueous solution illuminated by Xenon lamp, and the degradation process parameters, such as initial concentration of MO, initial pH value and amount of BiOBr catalyst were discussed to the degradation rate of the MO. Under the following experimental conditions of C0=10mg/L, pH=8, m(BiOBr)=1.0g/L, MO can be entirely degraded after 2.5 hours.

Removal of Nonylphenol from Water by Ozone

2013 ◽  
Vol 859 ◽  
pp. 357-360 ◽  
Author(s):  
Xiao Dong Wang ◽  
Yang Lv ◽  
Meng Meng Li ◽  
Hong Ye Liu
Keyword(s):  
Reaction Time ◽  
Ozone Concentration ◽  
Degradation Rate ◽  
Ph Value ◽  
Removal Rate ◽  
Affecting Factors ◽  
Initial Concentration ◽  
Lower Temperature ◽  
Better Than

This study investigates the degradation of Nonylphenol. The degradation affecting factors including solution ozone dosage, initial concentration, pH, temperature and ultraviolet. The results indicated that when the ozone contents changes, the Nonylphenols degradation rate changes as well. The higher ozone concentration contribute to the faster degradation; With the increase of initial concentration of Nonylphenol, the removal rate of it decrease on the contrary, while with the initial concentration increases, the quality of unit ozone degradation of Nonylphenol is ascenting and then tend to a constant; The remove rate of Nonylphenol is improving when the pH value vary from 4.86~10.34. The effect of Nonylphenols ozonation in higher temperatures is better than it is in lower temperature; Ultraviolet radiation is also favorable for the removal of Nonylphenol as it can shorten the reaction time as well as reduce the amount of ozone.

scholarly journals Experimental study on single factor effect of divergent ultrasonic degradation of methylene blue in water

2019 ◽  
Vol 118 ◽  
pp. 03051
Author(s):  
Yong-guang Bi ◽  
Xin-ting Zhang ◽  
Shao-qi Zhou
Keyword(s):  
Methylene Blue ◽  
Degradation Rate ◽  
Ph Value ◽  
Methylene Blue Solution ◽  
Solution Ph ◽  
Environmental Friendliness ◽  
Initial Concentration ◽  
Highly Active ◽  
Blue Solution ◽  
Ultrasonic Degradation

The study of divergent ultrasonic degradation of methylene blue in water was carried out by exploring the ultrasonic intensity of the methylene blue, the initial concentration and the degradation rate of the solution pH. The test results show that the degradation rate of methylene blue decreases with the increase of ultrasonic power.The initial concentration of methylene blue solution is in the range of 0.00-10.00 mg/L. The degradation rate of methylene blue increases as the concentration of the solution increases. when the concentration is greater than 10.00mg/L, the concentration increases, and the ultrasonic degradation rate decreases. When the pH value is higher, the degradation rate of the methylene blue solution increases with the increase of pH, and the degradation rate reaches a maximum of 77.89%. The region where the ultrasonic degradation of methylene blue occurs is mainly at the junction of gas-liquid two phases, and is degraded by forming hydrogen peroxide in the cavitation bubbles and decomposing into various highly active radicals. Ultrasound has the advantages of fast, low energy consumption and environmental friendliness.

Heteropolyacid Photocatalytical Degradation of Atrazine in Aqueous Solution under UV-Irradiation

2013 ◽  
Vol 652-654 ◽  
pp. 1680-1683
Author(s):  
Wei Yang Shen ◽  
Fei Ye Liu ◽  
Jian Qiu Chen ◽  
Rui Xin Guo
Keyword(s):  
Aqueous Solution ◽  
Organic Compounds ◽  
Uv Irradiation ◽  
Degradation Rate ◽  
Ph Value ◽  
Degradation Products ◽  
Affecting Factors ◽  
Obvious Effect ◽  
Initial Concentration ◽  
Temperature Exposure

The photodegradation of atrazine induced by UV-irradiation in aqueous solution was investigated initially. The affecting factors on the photodetradation were studied and described in details such as atrazine initial concentration, temperature, pH value, exposure intensity, oxidant and co-existing substances. It was found that the atrazine initial concentration had no obvious effect on the photodegradation. With the pH value increasing, photodegradation rates decreased. However, we also observed a positive correlation between the degradation rate of atrazine and temperature, exposure intensity and oxidant while the coexisting organic compounds may decelerate photodegradation of the atrazine in water. In this paper, the degradation products had also been confirmed by using LC-MS.

Removal of Bisphenol A from Water by Ozone

2013 ◽  
Vol 864-867 ◽  
pp. 155-160 ◽  
Author(s):  
Xiao Dong Wang ◽  
Yang Lv ◽  
Hong Ye Liu ◽  
Meng Meng Li
Keyword(s):  
Reaction Time ◽  
Bisphenol A ◽  
Degradation Rate ◽  
Ph Value ◽  
Removal Rate ◽  
Affecting Factors ◽  
Initial Concentration ◽  
Lower Temperature ◽  
Better Than

This study investigates the degradation of bisphenol A (BPA). The degradation affecting factors including solution ozone dosage, initial concentration, pH, temperature and ultraviolet. The results indicated that when the ozone contents changes, the BPAs degradation rate changes as well. The higher ozone concentration contribute to the faster degradation; With the increase of initial concentration of BPA, the removal rate of it decrease on the contrary, while with the initial concentration increases, the quality of unit ozone degradation of BPA is ascenting and then tend to a constant; The remove rate of BPA is improving when the pH value vary from 4.86~10.34. The effect of BPAs ozonation in higher temperatures is better than it is in lower temperature; Ultraviolet radiation is also favorable for the removal of BPA as it can shorten the reaction time as well as reduce the amount of ozone.

Photo-catalytic degradation of gaseous pollutants in paper mills of southern China

TAPPI Journal ◽  
2018 ◽  
Vol 17 (03) ◽  
pp. 167-178 ◽  
Author(s):  
Xin Tong ◽  
Jiao Li ◽  
Jun Ma ◽  
Xiaoquan Chen ◽  
Wenhao Shen
Keyword(s):  
Degradation Rate ◽  
Southern China ◽  
Catalytic Degradation ◽  
Pulp And Paper ◽  
Gaseous Pollutants ◽  
Pulp And Paper Mills ◽  
Paper Mills ◽  
Initial Concentration ◽  
First Order ◽  
First Order Kinetics

Studies were undertaken to evaluate gaseous pollutants in workplace air within pulp and paper mills and to consider the effectiveness of photo-catalytic treatment of this air. Ambient air at 30 sampling sites in five pulp and paper mills of southern China were sampled and analyzed. The results revealed that formaldehyde and various benzene-based molecules were the main gaseous pollutants at these five mills. A photo-catalytic reactor system with titanium dioxide (TiO2) was developed and evaluated for degradation of formaldehyde, benzene and their mixtures. The experimental results demonstrated that both formaldehyde and benzene in their pure forms could be completely photo-catalytic degraded, though the degradation of benzene was much more difficult than that for formaldehyde. Study of the photo-catalytic degradation kinetics revealed that the degradation rate of formaldehyde increased with initial concentration fitting a first-order kinetics reaction. In contrast, the degradation rate of benzene had no relationship with initial concentration and degradation did not conform to first-order kinetics. The photo-catalytic degradation of formaldehyde-benzene mixtures indicated that formaldehyde behaved differently than when treated in its pure form. The degradation time was two times longer and the kinetics did not reflect a first-order reaction. The degradation of benzene was similar in both pure form and when mixed with formaldehyde.

Preparation of Sands Modified by Aluminous Salt and its Adsorption Capability of CD2+

2011 ◽  
Vol 130-134 ◽  
pp. 856-859
Author(s):  
Chun Sheng Ding ◽  
Yang Ping Fu ◽  
Qian Fen Zhu ◽  
Jing Fu
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Influencing Factors ◽  
Removal Efficiency ◽  
Specific Surface Area ◽  
Quartz Sand ◽  
Ph Value ◽  
Alkaline Condition ◽  
Initial Concentration ◽  
Adsorption Capability

In this experiment quartz sand was chosen as a carrier to be coated by aluminous salt under alkaline condition, and then the specific surface area was tested, and the adsorption capability and Cd2+ removal influencing factors of modified sand were studied. The investigation results showed that the specific surface area of modified sand was 75.244m2/g which was 9.38 times of that of original sand; the removal efficiency of Cd2+ by aluminous salt modified sand reached 59% contrast to 39% of original sand with pH 7.00. It was also found that the removal efficiency of Cd2+ by the aluminous salt modified sand was reduced with the increase of initial concentration of Cd2+ solution, and was enhanced with the increase of pH value, the Cd2+ removal efficiency was almost 71% with pH 9.0.

Study on Decolorization of Wastewater Containing Acid Orange II by Adsorption on Expanded Graphite

2011 ◽  
Vol 183-185 ◽  
pp. 873-876
Author(s):  
Jun Jie Yue ◽  
Xing Long Jin ◽  
Zhao Hui Jin
Keyword(s):  
Ph Value ◽  
Expanded Graphite ◽  
Orange Ii ◽  
Dye Wastewater ◽  
Temperature Level ◽  
Initial Concentration ◽  
Acid Orange ◽  
Ph Values ◽  
Simulated Wastewater ◽  
Acid Orange Ii

In this paper, the adsorption and decolorization capability of expanded graphite (EG) on the simulated wastewater containing Acid Orange Ⅱwere studied. The experimental results show that the initial concentration of wastewater, the dosage of EG, the pH value and the temperature all have greater effects on the decolorization ratio of simulated Acid Orange Ⅱ wastewater. The dye- wastewater containing lower concentration(＜150 mg/L) of Acid Orange Ⅱ is more suitable to be treated by EG, and approximately 100 mg/L is the preferable concentration. The decolorization ratio increases with the increment of the dosage of EG and the temperature level, but the growth rate obviously decreases at the higher initial concentration. All the decolorization ratios under strong acidic (pH<5) and alkalic (pH>11) conditions are higher than that at the range of 5-11 pH values, the highest value even reaches over 94%, while the decolorization ratio under the latter conditions are only between 75% and 85%.

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