Formation of reactive chlorine species in saline solution treated by non-equilibrium atmospheric pressure He/O-2 plasma jet

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F19%3A00505573" target="_blank" >RIV/61389021:_____/19:00505573 - isvavai.cz</a>

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/1361-6595/ab0930" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-6595/ab0930</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6595/ab0930" target="_blank" >10.1088/1361-6595/ab0930</a>

Result language

angličtina

Original language name

Formation of reactive chlorine species in saline solution treated by non-equilibrium atmospheric pressure He/O-2 plasma jet

Original language description

The aqueous-phase chemistry of reactive chlorine species initiated in saline solution by the gas phase discharge plasma above the liquid surface was investigated. A micro-atmospheric pressure 13.56 MHz plasma jet operating with a 0.6% O-2 in He was used to promote reactions of plasma-generated oxygen atoms with chloride anions at the gas-liquid interface. Physiological NaCl solution and phosphate buffered saline (PBS) were used. Three chlorine oxoacids or their conjugate bases were detected in the plasma treated saline: hypochlorites HOCl/OCl-, chlorites ClO2-, and chlorates ClO3-, being formed in the concentration ratio 4.5:1:1, respectively. In addition, chlorine dioxide ClO2 was formed in minor amounts. The final pH value of the plasma treated saline was typically 10.2. The total hypochlorite production, [HOCl] [OCl-], was directly proportional to the initial NaCl concentration, supporting the idea of a direct reaction of Cl- with O atoms. Subsequent post-discharge chemical processes in the bulk plasma treated saline solution were found to lead to the disproportionation of hypochlorite into different oxidation states of chlorine with formation of ClO3- as the final product. The reactivity of O atoms in NaCl solution was studied using taurine and phenol as chemical probes. Experiments with 50 mM taurine revealed a very high initial formation rate of OCl- in PBS (up to 4 mu M s(-1)). Chlorinated products of phenol (2- and 4-chlorophenol) in addition to the hydroxylated products (hydroquinone and catechol) demonstrated chlorination of phenol by hypochlorite. The rate of Cl- oxidation by O atoms was estimated to be 2-3 orders slower than the reaction of O atoms with phenol.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

<a href="/en/project/GA19-25026S" target="_blank" >GA19-25026S: Characteristics of chemically reactive liquids produced by non-equilibrium plasma</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Plasma Sources Science & Technology

ISSN

0963-0252

e-ISSN

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Volume of the periodical

28

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

14

Pages from-to

035015

UT code for WoS article

000461949300002

EID of the result in the Scopus database

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