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Decoloration of Azo Dye by Electrodeless Discharge in Water

The decoloration of azo dye (Methyl Orange, MO) by a electrodeless discharge was analyzed. The discharge was generated under and above the pinhole(s) of the insulating plate, which was used to separate the electrodes. The effects of hydroxyl radical scavenger (sodium carbonate) and TiO2 on MO decoloration were studied. The results show that the decoloration rate of MO can be decreased by adding the carbonate ions to the solution, but it will be increased by adding the TiO2. The UV-Vis and FTIR spectras show that the azo bond (-N=N-) of the MO is broken up by corona discharge, and the phenyl-rings is further opened to form small molecular compounds such as organic acid.