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Development of low power non-thermal plasma jet and optimization of operational parameters for treating dyes and emerging contaminants

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Plasma Science and Technology 2022年第10期24卷 86-97页

作者： Deepchandra JOSHI G Veda PRAKASH shaikh ziauddin ahammad Satyananda KAR T R SREEKRISHNAN Department of Biochemical Engineering and Biotechnology Indian Institute of Technology DelhiNew Delhi 110016India Department of Energy Science and Engineering Indian Institute of Technology DelhiNew Delhi 110016India

Non-thermal plasma has emerged as an effective treatment system against the latest class of highly recalcitrant and toxic environmental pollutants termed emerging contaminants(ECs).In the present work,a detailed experimental study is carried out to evaluate the efficacy of a non-thermal plasma jet with two dyes,Rd.B and ***,as model *** plasma jet provided a complete dye decoloration in 30 min with an applied voltage of 6.5 kV_(p-p).·OH,having the highest oxidation potential,acts as the main reactive species,which with direct action on contaminants also acts indirectly by getting converted into H_(2)O_(2)and O_(3).Further,the effect of critical operational parameters viz,sample pH,applied voltage(4.5–6.5 kV_(p-p)),conductivity(5–20 mS cm^(-1)),and sample distance on plasma treatment efficacy was also *** of all the assessed parameters,the applied voltage and sample conductivity was found to be the most significant operating parameters.A high voltage and low conductivity favored the dye decoloration,while the pH effect was not that *** understand the influence of plasma discharge gas on treatment efficacy,all the experiments are conducted with argon and helium gases under the fixed geometrical *** the gases provided a similar dye decoloration *** DBD plasma system with complete dye removal also rendered maximum mineralization of 73%for Rd.B,and 60%for ***,the system's efficiency against the actual ECs(four pharmaceutical compounds,viz,metformin,atenolol,acetaminophen,and ranitidine)and microbial contaminant(***)was also *** system showed effectivity in the complete removal of targeted pharmaceuticals and a log2.5 *** *** present systematic characterization of dye degradation could be of interest to large communities working towards commercializing plasma treatment systems.

关键词： advanced oxidation processes(AOPs) non-thermal plasma dye-degradation ECs treatment reactive species quantification mineralization

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