KN-B removal from water by non-thermal plasma

2013 ◽  
Vol 68 (6) ◽  
pp. 1288-1292 ◽  
Author(s):  
Ya-nan Liu ◽  
Lu Tian ◽  
Rui Li ◽  
Shu-fang Mei ◽  
Gang Xue ◽  
...  
Keyword(s):  
Barrier Discharge ◽  
Ph Value ◽  
Degradation Process ◽  
Reactive Black 5 ◽  
Dielectric Barrier ◽  
Chromophore Group ◽  
Low Concentrations ◽  
Initial Ph ◽  
Non Thermal Plasma ◽  
High Concentrations

The degradation of Reactive Black 5 (KN-B) in water using double-dielectric barrier discharge (DDBD) was studied. Experimental results showed that the KN-B degradation rate increased as the initial pH decreased. Low concentrations of Fe2+ enhanced the degradation, whereas high concentrations of Fe2+ hindered the degradation. The results showed that DDBD did not noticeably reduce total organic carbon but did reduce the pH value and improve the biodegradability of the solution significantly. Furthermore, the UV–Vis spectra of the dye showed that the chromophore group was damaged and that the solution was decolorized after the 10-min degradation process.

Degradation of Reactive Black 5 in Aqueous Solution by Double-Dielectric Barrier Discharge

2012 ◽  
Vol 610-613 ◽  
pp. 1616-1619
Author(s):  
Shu Fang Mei ◽  
Ya Nan Liu
Keyword(s):  
Aqueous Solution ◽  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Degradation Mechanism ◽  
Degradation Process ◽  
Reactive Black 5 ◽  
Dielectric Barrier ◽  
Treated Sample ◽  
Conductivity Increase ◽  
Decolorization Efficiency

Degradation of Reactive Black 5 in aqueous solution was studied by double-dielectric barrier discharge, degradation efficiency and degradation mechanism has been investigated. Results shows that during in ten minutes degradation, decolorization efficiency can reach 98.76%,COD and TOC could not be reduce observably, while the biodegradability has been greatly improved, the BOD5/COD ratio increase from 0.079 to 0.495.Decolorization efficiency is higher than that of mineralization, decolorization follows the first order kinetics with a constant rate of 0.4008 min-1. pH of the solution decrease gradually, but the conductivity increase during the degradation process. The ions of sulfate, nitrate, acetic acid, and oxalic acid have been found in the final treated sample and their concentrations increase with the reaction time. Chromophore group is damaged firstly and the solution has been decolorized efficiently, the degradation of benzene ring and naphthalene ring is more difficult than that of the azo bond, and the reduction or disappearance of absorption peaks indicates that the aromatic ring of KN-B was degraded partly.

Degradation of methyl orange using dielectric barrier discharge water falling film reactor

2017 ◽  
Vol 20 (2) ◽  
Author(s):  
Baowei Wang ◽  
Meng Xu ◽  
Chunmei Chi ◽  
Chao Wang ◽  
Dajun Meng
Keyword(s):  
Methyl Orange ◽  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Ph Value ◽  
Falling Film ◽  
Catalytic Systems ◽  
Dielectric Barrier ◽  
Initial Ph ◽  
Film Reactor ◽  
Degradation Of Methyl Orange

AbstractThe dielectric barrier discharge (DBD) technique based cylindrical water falling film reactor was used for degrading an azo dye methyl orange (MO). The primary conditions affecting the degradation of methyl orange were systematically investigated. After 30 min plasma treatment, the degradation rate of MO was as high as 93.7% with gas velocity of 300 mL/min and the input energy of 72.5W. The influences of initial pH and conductivity of MO solution were also explored. The results indicated that the optimum pH value was 3.02 and 99.1% removal of MO was achieved within 30 min. Three catalytic systems DBD/Fe

The Formation of Plasma Acid at Atmospheric Pressure and its Application in Hydrolysis of Microcrystalline Cellulose

2013 ◽  
Vol 750-752 ◽  
pp. 1626-1629
Author(s):  
Bo Yuan ◽  
Ying Wang ◽  
Ying Chao Ji ◽  
Qiu Hong Wang
Keyword(s):  
Microcrystalline Cellulose ◽  
Atmospheric Pressure ◽  
High Performance ◽  
Barrier Discharge ◽  
Ph Value ◽  
Reducing Sugar ◽  
Dielectric Barrier ◽  
Integrated Optical ◽  
Hydrolysis Of ◽  
Single Factor Experiment

In this paper, plasma acid was obtained by treating distilled water with dielectric barrier discharge at atmospheric pressure in order to hydrolyze cellulose. The acidity of plasma acid was studied through a single factor experiment. A plasma acid with pH value of 1.42 was obtained and used to hydrolyze microcrystalline cellulose at 80°C for 60min. Under this condition, the integrated optical density (IOD) of the hydrolysis sample was 0.589. Based on standard glucose curve, the total reducing sugar (TRS) was calculated to be 53.75mg and the TRS yield was 53.75%. The filtrate was evaporated to get the solid hydrolysis sample to be analyzed by High-performance liquid chromatography (HPLC). The results showed that the sample mainly consisted of glucose, which proved that microcrystalline cellulose could be hydrolyzed by plasma acid. Therefore, it could be concluded that it was an environmentally friendly and economical method to hydrolyze the microcrystalline cellulose by plasma acid.

Research Progress of Plasma Technology in Treating NO, SO2 and Hg0 from Flue Gas

2013 ◽  
Vol 295-298 ◽  
pp. 1293-1298 ◽  
Author(s):  
Bao Jun Jia ◽  
Yang Chen ◽  
Qin Zhong Feng ◽  
Li Yuan Liu
Keyword(s):  
Flue Gas ◽  
Air Pollutants ◽  
Barrier Discharge ◽  
Rapid Development ◽  
Atmospheric Environment ◽  
Research Progress ◽  
Plasma Technology ◽  
Dielectric Barrier ◽  
Synergistic Mechanism ◽  
Non Thermal Plasma

With the rapid development in industrialization and urbanization, various air pollutants are emitted into atmospheric environment. NO, SO2, Hg0are the most important pollutant in the flue gas. The application of non-thermal plasma (NTP) technology in the removal of NO, SO2, Hg0was reviewed respectively. Environmental applications have mainly involved plus corona discharge (PCD) and dielectric barrier discharge (DBD) system. In the future, the application of plasma technology in the flue gas could be focused on multiple pollutants synergistic mechanism.

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