HYDROXYLAMINE-NITRILOTRIACETIC ACID ENHANCED Fe(Ⅲ)/H2O2 SYSTEM FOR DEGRADATION OF ORANGE G
To improve the shortcomings of the traditional Fenton method,such as narrow pH application range and high iron mud production,the present study developed an Fe(Ⅲ)-nitrilotriacetic acid(NTA)/hydroxylamine(HAm)/H2O2 system for the degradation of azo dye Orange G(OG).Experimental results demonstrated that Fe(Ⅲ)-NTA/HAm/H2O2 system could effectively degrade OG under neutral condition with a degradation rate of 90％above,and OH was the dominant reactive species responsible for OG degradation in this system.The degradation rate of OG in the Fe(Ⅲ)-NTA/HAm/H2O2 system decreased with the increase of solution pH.Appropriate increases in Fe(Ⅲ),NTA,HAm,and H2O2 concentrations were beneficial for OG degradation in this system,but excessive addition of these reagents would inhibit OG degradation.The introduction of NTA could expand the pH application range of the traditional Fenton process from acidic to weakly alkaline,and the addition of HAm remarkedly reduced the dosage of Fe by promoting the regeneration of Fe(Ⅱ)in the system.Compared with the traditional Fenton process,this Fe(Ⅲ)-NTA/HAm/H2O2 system showed great potential for practical applications.
hydroxylaminenitrilotriacetic acidFenton processadvanced oxidation technologiesOrange G
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