Decolorization of orange II by catalytic oxidation using iron (III) phthalocyanine-tetrasulfonic aci.pdf

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Decolorization of orange II by catalytic oxidation using iron (III) phthalocyanine-tetrasulfonic aci.pdf

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Decolorization of orange II by catalytic oxidation using iron (III) phthalocyanine-tetrasulfonic aci

Journal of Hazardous Materials B114 (2004) 175–181 Decolorization of orange II by catalytic oxidation using iron (III) phthalocyanine-tetrasulfonic acid Sinta Rismayani 1 , Masami Fukushima ? , Hiroyasu Ichikawa, Kenji Tatsumi National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba-West, Tsukuba 305-8569, Japan Received 5 February 2004; received in revised form 11 August 2004; accepted 18 August 2004 Available online 25 September 2004 Abstract 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 KHSO5 as an oxygen donor. The nature of the decolorization of AO7 was investigated in the catalyst concentration range of 10–50 M, in which the initial concentration of AO7 was 417 mg l-1. A 99.6% decolorization was observed at [KHSO ] = 2.5 mM and [Fe(III)-PcTS] = 20 M after a 3-h reaction period. However, the fact that only 4.9% of the TOC was removed i t a p o ? K 1 m s o r d u b t r f c s 0 d5 ndicated that the conversion to CO2 was incomplete. The results of a total organic nitrogen analysis of the reaction mixture showed that he nitrogen in the azo chain was mainly converted to N2 gas. In addition, 38.6% of the AO7 was converted to 1,2-dihydroxynaphthalene, nd 21.4% to p-phenolsulfonic acid. These results indicate that the degradation via this catalytic system involves the conversion of AO7 to henolic compounds, followed by N2 production. In addition, a Microtox test showed that toxicity of the solution increased as a result of AO7 xidation using this catalytic system. 2004 Elsevier B.V. All rights reserved. eywords: Azo dyestuff; Orange II; Oxidation; Decolorization; Iron(III) phthalocyanine-tetrasulfonic acid; Toxicity . Introduction Colored contaminants in aquatic environments are com- on problems associated with the dye industry and are an is- ue of environmental concern. When color is fixed to a fabr