在铁离子存在下用Ir-Sn-Sb氧化物阳极对酸性黄36偶氮染料进行电催化氧化过程中与活性氯发生Fenton样反应的证据,Applied Catalysis B: Environment and Energy

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在铁离子存在下用Ir-Sn-Sb氧化物阳极对酸性黄36偶氮染料进行电催化氧化过程中与活性氯发生Fenton样反应的证据
Applied Catalysis B: Environment and Energy ( IF 20.2 ) Pub Date : 2017-01-12 00:01:09
Zaira G. Aguilar, Enric Brillas, Mercedes Salazar, José L. Nava, Ignasi Sirés

在带有反应器的流动装置中研究了pH 3.0下2.5L酸性黄36溶液在pH 3.0下的降解，该反应器包含一个Ir-Sn-Sb氧化物阳极和一个不锈钢阴极。阳极通过Pechini方法在Ti上制备，并通过SEM-EDX和XRD表征。它表现出一定在硫酸介质从水氧化electrocatalyze两者吸附OH的生成能力，更主要是，在含有氯的混合电解质生产的活性氯^-离子。在后一种介质中对染料溶液进行EO处理会导致快速脱色，因为活性氯化胆碱会破坏形成的有色副产物，但是在纯NaClO ₄或Na ₂ SO _4中脱色的速度要慢得多由于OH的形成有限。相反，在两个纯电解质获得更高的矿化由于形成的副产物中氯的存在^-在很大程度上成为持久的。研究了液体流速，电流密度和染料含量对混合电解质中EO性能的影响。吸光度和染料浓度的下降服从拟一级动力学。有趣的是，在1.0mM Fe ²⁺催化下，脱色率，染料浓度衰减和TOC去除均得到增强。这种更好的性能可以归因于在电生成的HClO和添加的Fe ²⁺之间通过类似于Fenton的电过程形成的OH。由于某些难熔中间体的光解作用，在用UVA光照射溶液后，通过类似光电子Fenton的方法实现了更大的矿化作用。检测到马来酸和乙酸为最终的短链线性羧酸。氯的损失^-和C10形成₃ ^-，CLO ₄ ^-，SO ₄ ^2-，NO ₃ ^-和NH ₄ ⁺被评价为良好。

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Evidence of Fenton-like reaction with active chlorine during the electrocatalytic oxidation of Acid Yellow 36 azo dye with Ir-Sn-Sb oxide anode in the presence of iron ion

The degradation of 2.5L of Acid Yellow 36 solutions at pH 3.0 by electro-oxidation (EO) has been studied in a flow plant with a reactor containing an Ir-Sn-Sb oxide anode and a stainless steel cathode. The anode was prepared onto Ti by the Pechini method and characterized by SEM-EDX and XRD. It showed a certain ability to electrocatalyze both, the generation of adsorbed OH from water oxidation in sulfate medium and, more largely, the production of active chlorine in a mixed electrolyte containing Cl⁻ ion. The EO treatment of the dye solution in the latter medium led to a rapid decolorization because active chorine destroyed the colored by-products formed, but color removal was much slower in pure NaClO₄ or Na₂SO₄ due to the limited formation of OH. In contrast, greater mineralization was obtained in both pure electrolytes since the by-products formed in the presence of Cl⁻ became largely persistent. The effect of liquid flow rate, current density and dye content on the EO performance in the mixed electrolyte was examined. The drop of absorbance and dye concentration obeyed a pseudo-first-order kinetics. Interestingly, the decolorization rate, dye concentration decay and TOC removal were enhanced upon catalysis with 1.0mM Fe²⁺. Such better performance can be accounted for by the formation of OH in the bulk from the electro-Fenton-like process between electrogenerated HClO and added Fe²⁺. Even larger mineralization was achieved by the photoelectro-Fenton-like process upon irradiation of the solution with UVA light due to photolysis of some refractory intermediates. Maleic and acetic acids were detected as final short-chain linear carboxylic acids. The loss of Cl⁻ and the formation of ClO₃ ⁻, ClO₄ ⁻, SO₄ ²⁻, NO₃ ⁻ and NH₄ ⁺ were evaluated as well.

更新日期：2017-01-12

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