Organic dye decomposition by DC diaphragm discharge in water: Effect of solution properties on dye removal

Stará, Zdeňka; Krčma, František; Nejezchleb, Martin; Skalný, J. D.

doi:10.1016/j.desal.2008.03.025

Cited by 36 publications

(24 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, Fig. 1 shows that glow discharge electrolysis [23], diaphragm discharges [18], and contact glow discharge electrolysis [26] are at the bottom of relativeenergy efficiency scale. Continuous DC high voltages power these reactors where a major portion of input energy is wasted in heating the treated liquid, requiring forced cooling of the treated liquid.…”

Section: Discussionmentioning

confidence: 99%

“…The condition of 50% conversion is selected for two reasons: (a) maximum data is available for this conversion, and (b) analysis errors, or interference from intermediates may not be negligible at [50% conversion [18]. Initial solution pH 5-8 is chosen because the energy yield becomes highly sensitive to pH changes in strongly acidic or strongly basic conditions [19].…”

Section: Selection Of Comparable Experimental Conditionsmentioning

confidence: 99%

See 1 more Smart Citation

Water Purification by Plasmas: Which Reactors are Most Energy Efficient?

Malik

2009

Plasma Chem Plasma Process

339

177

View full text Add to dashboard Cite

Decomposition of toxic organic compounds is a major environmental problem. Increasingly, research is being conducted to use plasmas to decompose these wastes in water, as it is simple, effective and does not require the addition of other chemical agents. Different groups have used varied reactor designs. This study calculates and compares relative energy yields of about 27 major types of plasma reactors. The results reveal dramatic differences in the energy yields, up to five orders of magnitude. The most efficient are pulse powered reactors, in which plasma is formed in gas phase and the waste solution sprayed into it. Factors that account for this improved energy yield are discussed. This study will help narrow down efficient reactors for further studies, development and commercial uses.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Selection Of Comparable Experimental Conditionsmentioning

confidence: 99%

Water Purification by Plasmas: Which Reactors are Most Energy Efficient?

Malik

2009

Plasma Chem Plasma Process

339

177

View full text Add to dashboard Cite

show abstract

“…As it has been discussed above, solution conductivity significantly influences the discharge breakdown and operation itself. On the other hand, solution pH affected mainly chemical reactions initiated by the discharge in various solutions and liquids in general, as it was already proved in [21]. Besides solution conductivity and pH, temperature is also one of the most important physical parameters that should be checked during various plasma treatments.…”

Section: Resultsmentioning

confidence: 99%

Generation of High Frequency Pin-hole Discharge in Water Solutions

2014

Self Cite

View full text Add to dashboard Cite

This paper presents results on electric discharge generation by high frequency high voltage (15-100 kHz) in NaCl solutions with different initial conductivity (100-1300 mS cm -1 ), and compares them with DC discharge in the same electrode configuration. A batch plasma reactor in the pin-hole configuration contained a ceramic dielectric barrier separating two planar stainless steel electrodes; barrier thickness of 0.6 mm and pin-hole diameter of 0.6 mm was used. Lissajous charts were evaluated from electric measurements for different discharge phases (electrolysis, bubble formation and discharge regular operation). Breakdown moments for different solution conductivities were determined from discharge power evaluation as a function of applied frequency. Breakdown voltage amplitude was decreased by the increasing conductivity in both regimes while frequency and current decreased. Changes of physical parameters (temperature, solution conductivity and pH) as well as production of hydrogen peroxide at different solution conductivities were compared. Solution conductivity was increased in both discharge regimes and with the initial conductivity value. Solution temperature was increased by the discharge in both regimes and with the increasing initial conductivity, too. Solution pH dropped to acidic conditions when HF or DC positive regime was applied while it was enhanced by DC negative regime.

show abstract

“…A special polycarbonate batch discharge reactor was used for organic dye decomposition in water solutions. This device was already described in details in and its simplified scheme is shown in Figure a. The reactor was divided by a changeable dielectric barrier into two identical electrode parts.…”

Section: Methodsmentioning

confidence: 99%

“…This coaxial DBD reactor is a source of a wide range of reactive species such as O 3 , H 2 O 2 , • OH, created both in the gas and in the liquid phase. The second and the third plasma system is the dc diaphragm discharge (DD) which produces atmospheric pressure non‐thermal plasma of two polarities in one discharge reactor . The plasma is generated in bubbles of water vapor that are formed directly in the bulk water.…”

Section: Introductionmentioning

confidence: 99%

Comparison of liquid and liquid‐gas phase plasma reactors for discoloration of azo dyes: Analysis of degradation products

Kozáková

Klimova

Obradović

et al. 2018

Plasma Processes & Polymers

View full text Add to dashboard Cite

Three plasma systems are used for decomposition of two organic textile dyes. The highest discoloration efficiency over 90% is reached in the water falling film DBD when maximal energy of 270 and 450 kJ L−1 is applied into Reactive Yellow 125 and Direct Red 79 dye solutions, respectively. Decomposition of the dye molecules is confirmed by concentration decreases in dye chromatograms. Similar degradation products are identified in the positive diaphragm discharge and water falling film DBD. In the negative diaphragm discharge, different products are formed due to electrochemical reactions on the anode. Substitution of halogens, hydrogen addition on the azo group and the cleavage of the azo group itself are the main mechanisms contributing to the destruction of the dye molecule in the compared plasma systems.

show abstract

Organic dye decomposition by DC diaphragm discharge in water: Effect of solution properties on dye removal

Cited by 36 publications

References 13 publications

Water Purification by Plasmas: Which Reactors are Most Energy Efficient?

Water Purification by Plasmas: Which Reactors are Most Energy Efficient?

Generation of High Frequency Pin-hole Discharge in Water Solutions

Comparison of liquid and liquid‐gas phase plasma reactors for discoloration of azo dyes: Analysis of degradation products

Contact Info

Product

Resources

About