Laboratory of Materials, Nanotechnologies and Environment, Faculty of Sciences, Mohammed V University in Rabat, 4 Avenue Ibn Battouta, BP:1014, Rabat, Morocco.
Environ Sci Pollut Res Int. 2023 Jun;30(27):70183-70193. doi: 10.1007/s11356-023-27332-3. Epub 2023 May 5.
The textile industry contributes significantly to environmental pollution through dyeing and finishing processes that release dyes into wastewater. Even small amounts of dyes can have harmful effects and cause negative impacts. These effluents have carcinogenic, toxic, and teratogenic properties and can take a long time to be naturally degraded through photo/bio-degradation processes. This work investigates degradation of Reactive Blue 21 (RB21) phthalocyanine dye using anodic oxidation process with PbO anode doped with iron III (0.1 M) (marked as Ti/PbO-0.1Fe) and compared with pure PbO. Ti/PbO films with and without doping were successfully prepared by electrodeposition technology on Ti substrates. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM/EDS) was used to characterize the electrode morphology. Also, linear scanning voltammetry (LSV) and cyclic voltammetry (CV) tests were conducted to investigate the electrochemical response of these electrodes. The influence of operational variables on the mineralization efficiency was studied as a function of pH, temperature, and current density. Doping Ti/PbO with Fe (0.1 M) could reduce the particle to a smaller dimension and slightly increase the oxygen evolution potential (OEP). A large anodic peak was found for both electrodes prepared in the CV test, indicating that oxidation of the RB21 dye was easily achieved on the surface of the prepared anodes. No significant effect of initial pH on the mineralization of RB21 was observed. RB21 decolorization was more rapid at room temperature and increases with increasing current density. A possible degradation pathway for the anodic oxidation of RB21 in aqueous solution is proposed based on the identified reaction products. In general, it can be said that from the findings it was observed that the Ti/PbO and Ti/PbO-0.1Fe electrodes show good performance on RB21 degradation. However, it was noted that the Ti/PbO electrode tends to deteriorate over time and exhibits poor substrate adhesion, while the Ti/PbO-0.1Fe electrode displays superior substrate adhesion and stability.
纺织工业在染色和整理过程中排放染料会对环境污染造成重大影响。即使少量的染料也会产生有害影响，并造成负面影响。这些废水具有致癌、有毒和致畸性，并可能需要很长时间才能通过光/生物降解过程自然降解。本工作研究了锐钛矿型二氧化钛（TiO2）掺杂 PbO 阳极（标记为 Ti/PbO-0.1Fe）的阳极氧化过程对活性蓝 21（RB21）酞菁染料的降解，并与纯 PbO 进行了比较。通过在 Ti 基底上电沉积技术成功制备了掺杂和未掺杂的 Ti/PbO 薄膜。使用扫描电子显微镜（SEM）和能量色散 X 射线光谱（EDS）对电极形貌进行了表征。此外，还进行了线性扫描伏安法（LSV）和循环伏安法（CV）测试，以研究这些电极的电化学响应。研究了操作变量对矿化效率的影响，考察了 pH 值、温度和电流密度的影响。Ti/PbO 中掺杂 0.1 M 的 Fe 可以将颗粒尺寸减小到更小的尺寸，并略微增加析氧电位（OEP）。在 CV 测试中发现两个电极都有一个大的阳极峰，这表明 RB21 染料在制备阳极表面很容易被氧化。初始 pH 值对 RB21 矿化的影响不明显。RB21 的脱色在室温下更快，随着电流密度的增加而增加。基于鉴定的反应产物，提出了水溶液中 RB21 阳极氧化的可能降解途径。总的来说，可以说从研究结果中可以看出，Ti/PbO 和 Ti/PbO-0.1Fe 电极在 RB21 降解方面表现出良好的性能。然而，需要注意的是，Ti/PbO 电极随着时间的推移会恶化，并且表现出较差的基底附着力，而 Ti/PbO-0.1Fe 电极则表现出优异的基底附着力和稳定性。
