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Decolorization of orange II by catalytic oxidation using iron (III) phthalocyanine-tetrasulfonic acid [An article from: Journal of Hazardous Materials]
Description
This digital document is a journal article from Journal of Hazardous Materials, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Orange II, C.I. Acid Orange 7 (AO7), is oxidatively decolorized via catalytic oxidation by iron(III) phthalocyanine-tetrasulfonic acid (Fe(III)-PcTS) as a biomimetic catalyst and KHSO"5 as an oxygen donor. The nature of the decolorization of AO7 was investigated in the catalyst concentration range of 10-50@mM, in which the initial concentration of AO7 was 417mgl^-^1. A 99.6% decolorization was observed at [KHSO"5] = 2.5mM and [Fe(III)-PcTS] = 20@mM after a 3-h reaction period. However, the fact that only 4.9% of the TOC was removed indicated that the conversion to CO"2 was incomplete. The results of a total organic nitrogen analysis of the reaction mixture showed that the nitrogen in the azo chain was mainly converted to N"2 gas. In addition, 38.6% of the AO7 was converted to 1,2-dihydroxynaphthalene, and 21.4% to p-phenolsulfonic acid. These results indicate that the degradation via this catalytic system involves the conversion of AO7 to phenolic compounds, followed by N"2 production. In addition, a Microtox test showed that toxicity of the solution increased as a result of AO7 oxidation using this catalytic system.
Description:
Orange II, C.I. Acid Orange 7 (AO7), is oxidatively decolorized via catalytic oxidation by iron(III) phthalocyanine-tetrasulfonic acid (Fe(III)-PcTS) as a biomimetic catalyst and KHSO"5 as an oxygen donor. The nature of the decolorization of AO7 was investigated in the catalyst concentration range of 10-50@mM, in which the initial concentration of AO7 was 417mgl^-^1. A 99.6% decolorization was observed at [KHSO"5] = 2.5mM and [Fe(III)-PcTS] = 20@mM after a 3-h reaction period. However, the fact that only 4.9% of the TOC was removed indicated that the conversion to CO"2 was incomplete. The results of a total organic nitrogen analysis of the reaction mixture showed that the nitrogen in the azo chain was mainly converted to N"2 gas. In addition, 38.6% of the AO7 was converted to 1,2-dihydroxynaphthalene, and 21.4% to p-phenolsulfonic acid. These results indicate that the degradation via this catalytic system involves the conversion of AO7 to phenolic compounds, followed by N"2 production. In addition, a Microtox test showed that toxicity of the solution increased as a result of AO7 oxidation using this catalytic system.
