Decolorization of orange II by catalytic oxidation using iron (III) phthalocyanine-tetrasulfonic acid.
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 microM, in which the initial concentration of AO7 was 417 mg l(-1). A 99.6% decolorization was observed at [KHSO(5)] = 2.5 mM and [Fe(III)-PcTS] = 20 microM 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.
Rismayani
Sinta
S
National Institute of Advanced Industrial Science and Technology, 16-1 Onogawa, Tsukuba-West, Tsukuba 305-8569, Japan.
Fukushima
Masami
M
Ichikawa
Hiroyasu
H
Tatsumi
Kenji
K
D001391:Azo Compounds / Q000737:chemistry* / Q000633:toxicity; D001557:Benzenesulfonates / Q000737:chemistry* / Q000633:toxicity; D002384:Catalysis; D002852:Chromatography, Ion Exchange; D003116:Color; D004396:Coloring Agents / Q000737:chemistry* / Q000633:toxicity; D005290:Ferric Compounds / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007700:Kinetics; D008163:Luminescent Measurements; D008665:Metalloporphyrins / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry; D010084:Oxidation-Reduction; D018675:Toxicity Tests
D001391:Azo Compounds; D001557:Benzenesulfonates; D004396:Coloring Agents; D005290:Ferric Compounds; D007202:Indicators and Reagents; D008665:Metalloporphyrins; C430149:iron(III) tetrasulfonatophthalocyanine; D009584:Nitrogen; C014722:2-naphthol orange