Diagnostics of Argon Injected Hydrogen Peroxide Added High Frequency Underwater Capillary Discharge

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Mechanics, Materials Science & Engineering, September 2016

ISSN 2412-5954

Diagnostics of Argon Injected Hydrogen Peroxide Added High Frequency Underwater Capillary Discharge Muhammad Waqar Ahmed1, Sooseok Choi1, Jong-Keun Yang1, Rai Suresh1, Heon Ju Lee1 1

Department of Nuclear, Energy and Chemical Engineering, Jeju National University, 690-756, Republic of Korea DOI 10.13140/RG.2.2.16147.27684

Keywords: high frequency plasma discharge, hydrogen peroxide, emission spectroscopy, OH radicals.

ABSTRACT. The effects of hydrogen peroxide addition and Argon injection on electrical and spectral characteristics of 1mm) by applying high frequency (25 kHz) alternating current voltage (0-15kV) across -pin electrode configuration, separated by a gap distance of 10 mm. The results of no hydrogen peroxide addition and no Argon gas injection were compared with addition of hydrogen peroxide and Argon injection for different values. The emission spectrum was taken to present the increase in concentration of OH radicals with and without hydrogen peroxide addition under different argon injection rates. The results demonstrated that addition of hydrogen peroxide do not remarkably affected the conductivity of water, but its addition increased the yield rate of OH radicals generated by plasma discharge. The addition of Argon generated bubbles and gas channels reduced the high power consumption required for inducing flowing water long gap discharge. The results showed large concentration of OH radicals due to hydrogen peroxide addition, less required input power for generating flowing water discharge by using high frequency input voltage and due to Argon injection.

1. Introduction. The generation of reactive species like OH radicals, ozone, reactive hydrogen and oxygen through electrical discharge in water is of large interest and has been widely investigated by many researchers [1-3]. Through various diagnostics phenomena different kinds of reactive species were detected [4-5]. Among them ozone and OH radicals are of larger interest due to high redox potential (2.07V and 2.80V respectively) and their high sterilization rate [6]. These reactive species have wide range of environmental, biological, medical, Nano-technology and industrial applications [7-12]. OH radicals are widely used for controlling environmental pollution including drinking water and waste water treatment [13]. High redox potential reactive species are useful in blood treatment and E.Coli degradation when generated in water and other liquids through electrical discharge [1415]. Synthesis of Nano-particles and polymers surface modifications is another useful application of underwater plasma discharge and these reactive species can act as antibacterial agents [16-17]. The hydroxyl radicals can be generated by various mechanisms [18] else than electrical discharge in water, but researchers proved that the electrical discharge method is most effective method where high intensity of OH radicals can be obtained [19-20]. Therefore in this research electrical discharge in water was used to induce highly reactive oxidant species especially OH radicals. When plasma generated then highly intensive shock waves, high temperature, strong electric field generation and electron impact dissociation can cause water molecule to split into OH, other reactive species, ionization and excitation process. Under various chemical reactions the splitting and recombination of generated radicals and ionic species takes place to form OH, ozone and H2O2. Following are some common chemical reactions that occur in aqua system while inducing some highly reactive oxidant species [21]: H2

OH 2

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