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Photodegradation of orange I in the heterogeneous iron oxide-oxalate complex system under UVA irradiation

文献类型： 外文期刊

作者： Lei, Jing 1 ; Liu, Chengshuai 2 ; Li, Fangbai 2 ; Li, Xiaomin 3 ; Zhou, Shungui; Liu, Tongxu; Gu, Minghua; Wu, Q 1 ;

作者机构： 1.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Peoples R China

2.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Peoples R China; Guangxi Univ, Fac Agr, Nanning 630005, Peoples R China; Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China; S China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Peoples R China

3.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Peoples R China; Guangxi Univ, Fac Agr, Nanning 630005, Peoples R China; Chinese Acad Sci, Guangzhou Inst Geoch

关键词： iron oxide;oxalate;azo dye;photodegradation;photo-fenton

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

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收录情况： SCI

摘要： To understand the photodegradation of azo dyes in natural aquatic environment, a novel photo-Fenton-like system, the heterogeneous iron oxide-oxalate complex system was set up with the existence of iron oxides and oxalate. Five iron oxides, including γ-FeOOH, IO-250, IO-320, IO-420 and IO-520, were prepared and their adsorption capacity was investigated in the dark. The results showed that the saturated adsorption amount (Γ_(max)) was ranked the order of IO-250 > IO-320 > γ-FeOOH > IO-420 > IO-520 and the adsorption equilibrium constant (K_a) followed the order of IO-250 > IO-520 > γ-FeOOH > IO-420 > IO-320. The effect of initial pH value, the initial concentrations of oxalate and orange I on the photodegradation of orange I were also investigated in different iron oxide-oxalate systems. The results showed that the photodegradation of orange I under UVA irradiation could be enhanced greatly in the presence of oxalate. And the optimal oxalate concentrations (C_(ox)~0) for γ-FeOOH, IO-250, IO-320, IO-420 and IO-520 were 1.8, 1.6, 3.5, 3.0 and 0.8 mM, respectively. The photodegradation of orange I in the presence of optimal C_(ox)~0 was ranked as the order of γ-FeOOH > IO-250 > IO-320 > IO-420 > IO-520. The optimal range of initial pH was at about 3-4. The first-order kinetic constant for the degradation of orange I decreased with the increase in the initial concentration of orange I. Furthermore, the variation of pH, the concentrations of Fe~(3+) and Fe~(2+) during the photoreaction were also strongly dependent on the C_(ox)~0 and iron oxides.

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