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首页> 外文期刊>Electrocatalysis >Effect of Specific Active Chlorine Species and Temperature on the Electrochemical Degradation of the Reactive Blue 19 Dye Using a Boron-Doped Diamond or DSA Anode in a Flow Reactor
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Effect of Specific Active Chlorine Species and Temperature on the Electrochemical Degradation of the Reactive Blue 19 Dye Using a Boron-Doped Diamond or DSA Anode in a Flow Reactor

机译：活性氯物种和温度对流动反应器中掺硼金刚石或DSA阳极对活性蓝19染料电化学降解的影响

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摘要

Galvanostatic electrolyses were carried out to investigate the effect of specific active chlorine species (Cl2, HCIO, or ClO) and temperature on the degradation of reactive blue 19 dye(RB-19)solutions(500mg L~(-1) in 0.1 mol L ~(-1) Na2SO4), in the presence or absence of chloride ions, using two anodes of markedly different oxidation power: dimen-sionally stable anode (DSA — Ti/TiO2RuO2) or boron-doped diamond (Nb/BDD). In the absence of chloride ions in solution (at pH 6.0 and 25 C), the Nb/BDD anode, due to its higher oxidation power, was notably more effective in decolorizing the RB-19 dye than the DSA anode. Yet, when this decolorization was carried out by chloride-mediated electrooxidation (2 g L~-NaCl added to the dye solution), both anodes presented significantly enhanced performances, but now greater decolorization rates were attained with the DSA anode, especially at pH 1.0, when Cl2 is the predominant active chlorine species in solution; actually, the highest decolorization rates are attained at 10 °C, when the Cl2 solubility in solution increases. Clearly, Cl2 is the active chlorine species that most readily oxidizes the anthraquinone chromophore center of the RB-19 molecule. The rate of chloride-mediated COD abatement of the RB-19 dye solution was also analyzed (at pH 6.0 and 25 °C); now the oxidation power of the anode is again paramount and Nb/BDD presents a significantly superior performance, because hydroxyl radicals play a crucial role in the oxidation of organics, beyond that possible for the active chlorine species.
机译：进行恒电流电解，研究特定活性氯物质（Cl2，HCIO或ClO）和温度对0.1 mol L中的500 mg L〜（-1）活性蓝19染料（RB-19）溶液的降解的影响。 〜（-1）Na2SO4），在存在或不存在氯离子的情况下，使用两个氧化能力明显不同的阳极：尺寸稳定的阳极（DSA_Ti / TiO2RuO2）或掺硼金刚石（Nb / BDD）。在溶液中不存在氯离子的情况下（在pH 6.0和25 C下），Nb / BDD阳极由于其较高的氧化能力，在使RB-19染料脱色方面比DSA阳极显着更有效。但是，当通过氯化物介导的电氧化（向染料溶液中添加2 g L〜-NaCl）进行脱色时，两个阳极均表现出显着增强的性能，但现在使用DSA阳极可获得更高的脱色率，尤其是在pH 1.0时，当Cl2是溶液中的主要活性氯物种时;实际上，当Cl2在溶液中的溶解度增加时，最高的脱色率在10°C时达到。显然，Cl2是最容易氧化RB-19分子的蒽醌生色团中心的活性氯物质。还分析了RB-19染料溶液的氯离子介导的COD消除速率（在pH 6.0和25°C下）;现在，阳极的氧化能力再次成为重中之重，Nb / BDD表现出明显优越的性能，因为羟基自由基在有机物的氧化中起着至关重要的作用，超过了活性氯物种的可能。

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