增强型电场协助光催化降解有机污染物

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以颗粒状TiO2 为光催化剂 ,以苯酚溶液的降解为模型反应 ,实现了在电场协助下三维光电组合催化反应 .实验发现 ,在相同的反应条件下 ,电解反应和光催化反应中苯酚的降解率分别为 10 %和 33 6 % ,而光电组合催化过程中苯酚的降解率为 82 8% ,存在明显的协同作用 .产生这种协同作用的主要原因是 ,电解水反应可有效地为光催化反应提供氧源 ,以及阳极偏压可有效地减少光生电子和空穴的复合 .此外 ,还研究了电量和溶液酸碱性对光电组合催化反应活性的影响 .对实际工业废水处理的小试实验表明 ,该方法可取得较高的COD(化学需氧量 )去除率和脱色率 With the granular TiO2 as the photocatalyst and the degradation of the phenol solution as the model reaction, the three-dimensional photoelectrocatalytic reaction was achieved with the aid of the electric field. The experimental results showed that under the same reaction conditions, the degradation rates of phenol in the electrolysis reaction and the photocatalytic reaction were respectively Was 10% and 33 6%, respectively, while the phenol degradation rate was 82.8% in the photoelectrocatalytic catalysis process, and there was a significant synergistic effect.The main reason for this synergistic effect is that the electrolysis water reaction can effectively provide photocatalytic reaction Oxygen source and anode bias can effectively reduce the recombination of photogenerated electrons and holes.In addition, the influence of the amount of electricity and the acidity and alkalinity of solution on the catalytic activity of photoelectrocatalytic recombination has also been studied.A small experimental study on the actual industrial wastewater treatment shows that, This method can achieve higher COD (chemical oxygen demand) removal rate and decolorization rate
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