Mineralization of Acid Yellow 36 azo dye by electro-Fenton and solar photoelectro-Fenton processes with a boron-doped diamond anode.
Mineralization of Acid Yellow 36 azo dye by electro-Fenton and solar photoelectro-Fenton processes with a boron-doped diamond anode.
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DOI：
10.1016/j.chemosphere.2010.11.013
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发表时间：
2011
期刊：
影响因子：
8.8
通讯作者：
E. Ruiz;Conchita Arias;E. Brillas;A. Hernández-Ramírez;J. Peralta-Hernández
中科院分区：
文献类型：
--
作者：
E. Ruiz;Conchita Arias;E. Brillas;A. Hernández-Ramírez;J. Peralta-Hernández
The degradation of the Acid Yellow 36 (AY36) azo dye is studied by electro-Fenton (EF) and solar photoelectro-Fenton (SPEF) using a recirculation flow plant with an undivided cell containing a boron-doped diamond anode and an air-diffusion cathode for H2O2electrogeneration, coupled with a solar photoreactor.将 2.5L 含有 108mgL−1 染料和 0.5mM Fe2+（pH 3.0）的溶液在恒流下进行对比处理。芬顿反应和阳极表面形成的羟基自由基是主要氧化剂。 SPEF 几乎实现了总矿化，而 EF 的 TOC 去除效果较差。这两个过程都会随着电流的增加而加速。在伪一级反应后，AY36 在 EF 和 SPEF 中以相似的速率衰减，但由于共轭副产物的形成，溶液脱色速度更慢。 SPEF中NH4+离子被释放，而EF中NO3-离子主要丢失。丙醇二酸、马来酸、富马酸、草酸、甲酸和草酰胺酸被检测为生成的羧酸。 Fe(III)-草酸盐络合物大量积聚在 EF 中，并且它们在 SPEF 中的快速光分解解释了其较高的氧化能力。随着电流减小，SPEF 方法可产生更高的电流效率和更低的能源成本，因此在低电流下更可行。
The degradation of the Acid Yellow 36 (AY36) azo dye is studied by electro-Fenton (EF) and solar photoelectro-Fenton (SPEF) using a recirculation flow plant with an undivided cell containing a boron-doped diamond anode and an air-diffusion cathode for H2O2electrogeneration, coupled with a solar photoreactor. A solution of 2.5L with 108mgL−1of the dye and 0.5mM Fe2+at pH 3.0 was comparatively treated at constant current. Hydroxyl radicals formed from Fenton’s reaction and at the anode surface are the main oxidants. Total mineralization is almost achieved in SPEF, while EF yields poor TOC removal. Both processes are accelerated with increasing current. AY36 decays with similar rate in EF and SPEF following a pseudo first-order reaction, but the solution is more slowly decolorized because of the formation of conjugated byproducts. NH4+ion is released in SPEF, while NO3-ion is mainly lost in EF. Tartronic, maleic, fumaric, oxalic, formic and oxamic acids are detected as generated carboxylic acids. Fe(III)-oxalate complexes are largely accumulated in EF and their quick photodecomposition in SPEF explains its higher oxidation power. The SPEF method yields greater current efficiency and lower energy cost as current decreases, and then it is more viable at low currents.