The catalytic oxidation of the azo dye Orange II by hydrogen peroxide in aqueous solution has been investigated using 5,10,15,20-tetrakis-[4-(diethylmethylammonio)phenyl]porphyrinato-cobalt(II) tetra iodide 1as catalyst. The oxidation reaction was followed by recording the UV–vis spectra of the reaction mixture with time at λ_max = 485 nm. The factors that may influence the oxidation of Orange II, such as the effect of reaction temperature, concentration of catalyst, hydrogen peroxide and orange II have been studied. The results of total organic carbon analysis showed 52% of dye mineralization under mild reaction conditions. Residual organic compounds in the reaction mixture were identified by using Gas chromatography-mass spectrometry. The decolorization rate and mineralization of the dye has been found to increase with increase of catalyst concentration and reaction temperature. The rate of dye oxidation decreased with increasing the concentration of dye, H₂O₂ and at higher pH than 9. Radical scavenging measurement indicated that decolorization of Orange II by H₂O₂/cobalt (II) porphyrin complex 1 involved the formation of hydroxyl radicals as the active species.

偶氮染料橙II通过在水溶液中过氧化氢的催化氧化一直使用5,10,15,20-四- [4-（diethylmethylammonio）苯基]卟啉-钴（II）四碘化研究1作为催化剂。氧化反应后，在λ随时间记录所述反应混合物的UV-vis光谱_最大 = 485纳米。研究了可能影响Orange II氧化的因素，例如反应温度，催化剂浓度，过氧化氢和Orange II的影响。总有机碳分析结果表明，在温和的反应条件下，染料的矿化率为52％。通过使用气相色谱-质谱法鉴定反应混合物中的残留有机化合物。已经发现，随着催化剂浓度和反应温度的提高，染料的脱色速率和矿化度增加。染料的氧化速率随着染料浓度，H ₂ O _2的增加以及在高于9的pH值而降低。自由基清除测量表明，H ₂ O ₂对橙II脱色。/钴（II）卟啉配合物1涉及羟基自由基的形成。