Electrochemical degradation of gallic acid on a BDD anode.
Electrochemical degradation of gallic acid on a BDD anode.
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DOI：
10.1016/j.chemosphere.2009.09.007
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发表时间：
2009-11
期刊：
影响因子：
8.8
通讯作者：
M. Panizza;G. Cerisola
中科院分区：
文献类型：
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作者：
M. Panizza;G. Cerisola
研究了没食子酸（3，4，5-三羟基苯甲酸）在掺硼金刚石阳极（BDD）上的电化学氧化。采用循环伏安法、计时电流法和本体电解法研究了没食子酸在金刚石型阳极上的电化学行为和降解动力学。通过紫外光谱、高效液相色谱分析、COD和TOC测定等方法研究了没食子酸矿化的反应途径。结果表明，没食子酸的氧化既有直接电化学过程，也有介导电化学过程。没食子酸的降解符合准一级动力学，速率常数随电流的增大而增大。脂肪酸是电解过程中形成的主要中间产物，它们最终被矿化为CO2和水。掺硼金刚石的降解速率受质量传递控制，并受进入电化学反应器的溶液流速的增加的影响。
The electrochemical oxidation of gallic acid (3,4,5-trihydroxybenzoic acid) has been studied on a boron-doped diamond anode (BDD). Cyclic voltammetries, chronoamperometries and bulk electrolyses were performed to characterise the electrochemical behaviour of gallic acid on diamond-type anode and to study the kinetics of gallic acid degradation. UV spectroscopy, HPLC analysis, COD and TOC measurements were conducted to study the reaction pathway for gallic acid mineralisation. The results showed that both direct and mediated electrochemical processes were involved in the oxidation of gallic acid. The degradation of gallic acid evidenced a pseudo first-order kinetics and the rate constant increased with applied current. Aliphatic acids were the main intermediates formed during the electrolyses and they were finally mineralised to CO2and water. The degradation rate on boron-doped diamond was under mass-transport control and was favoured by the increase of the flow rate of the solution into the electrochemical reactor.