Treatments of simulated effluent solutions containing the Reactive Black 5 (RB5) were carried out by electrochemical, photoelectrochemical, electro-Fenton and photoelectro-Fenton methods using a one-compartment cell with a boron-doped diamond anode and a 3% of manganese dioxide nanoflowers supported on a carbon Vulcan XC72 gas diffusion electrode cathode. In the photo-assisted processes, the solution was irradiated using a 40-W UVC lamp immersed in the treated solution. For Fenton-based processes, only 5 min was required to attain 95% (photoelectro-Fenton) and 93% (electro-Fenton) RB5 dye degradation. When conversion to CO₂ is taken into account after 6-h treatment, electrochemical method mineralized ~ 13% of the organic load whereas removals greater than 90% were attained using the Fenton-based processes. These completely different results can be explained by the distinct spatial availability of the generated hydroxyl radical: only near the anode surface as in electrochemical-based processes or added to those distributed across the solution bulk as in Fenton-based processes.

(a) Percentage of colour removal at λ = 596 nm and (b) Removal of TOC % vs electrolysis time. Methods: (black square) EF-BDD (1), (red circle) EFPA-BDD, (blue up-pointing triangle) AO-BDD, (white square) EF-BDD (2) and (white circle) EF-BDD (3). In the EFPA-BDD systems, the solution was irradiated with a 46-W UVC lamp at λ = 254 nm.

使用带有硼掺杂金刚石阳极和3％二氧化锰纳米花的单室电池，通过电化学，光电化学，电芬顿和光电芬顿方法对包含活性黑5（RB5）的模拟废水进行处理。负载在碳Vulcan XC72气体扩散电极阴极上。在光辅助过程中，使用浸入处理过的溶液中的40 W UVC灯照射溶液。对于基于Fenton的过程，只需5分钟即可达到95％（光电Fenton）和93％（电子Fenton）RB5染料降解。转化为CO _2时考虑到经过6小时的处理后，如果使用Fenton基工艺，电化学方法会矿化约13％的有机物，而去除率则超过90％。这些完全不同的结果可以用生成的羟基自由基的独特空间可用性来解释：如在基于电化学的过程中仅在阳极表面附近，或如在基于Fenton的过程中被添加到整个溶液体中分布的羟基。

（a）在λ  = 596 nm处的颜色去除率，以及（b）TOC％去除率与电解时间的关系。方法：（黑色正方形）EF-BDD（1），（红色圆圈）EFPA-BDD，（蓝色向上指向三角形）AO-BDD，（白色正方形）EF-BDD（2）和（白色圆圈）EF-BDD （3）。在EFPA-BDD系统中，用46 W UVC灯以λ  = 254 nm照射溶液。