We examined the decolorization of Acid Red B (ARB) in glow/spark discharge plasma (GDP/SDP). It is found that the decolorization of ARB was observably higher in GDP than in SDP. After 16 min treatment, ARB decolorization rate reached 97.16% with the energy efficiency of 7.16 kg/kW-h in GDP, and 92.76% with 0.84 kg/kW-h energy efficiency in SDP. The average yield of plasma oxidants were 1.73 kg/kW-h in GDP, and 0.14 kg/kW-h in SDP. Some factors, which probably affect the decolorization of ARB aqueous solution, such as hydroxyl radical and ultraviolet radiation etc. were investigated. The results showed that plasma oxidation, especially hydroxyl radical might be main factors accounting for ARB decolorization.
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