BDD薄膜电极电化学处理难降解有机废水的研究进展

Research progress in non-biodegradable organic sewage treatment with thin BDD film electrode

BDD薄膜电极作为一种新型的电极材料运用于废水处理是环境电化学领域的研究热点。介绍了BDD薄膜的表面形貌和结构、制备方法及该薄膜电极的电化学特性,并对其在酚类废水、染料废水、农药废水等难降解有机废水中的研究进展进行了总结,同时指出目前研究存在的问题,并展望了BDD薄膜电极电化学处理技术的应用前景。

The given paper is aimed at summarizing the electrochemical research in the BDD thin film electrode and its application to non-biodegradable pollutant degradation. As is known, it is a hard problem to treat non-biodegradable organic sewage. But BDD thin film electrode, as a new type of electrode material, has come to aid in this way to solve the hardnuts in this field, because, as compared with ordinary electrodes, BDD thin film electrode enjoys a series of technical advantages, such as light weight, high strength, wear-resistant, corrosion-resistant, thermal conductivity, perfect insulation and many other nice physical properties. The characterization of SEM, Raman spectrum demonstrates that BDD thin film is compact, constant, consistent, uniformly, as well as fine in its quality. Even if it were put in a hydrofluoric acid solution for a long time, it could still keep its nice stable performance. In electrochemistry, it has also a very wide potential window in aqueous and non-aqueous solutions, such as hydrogen evolution potential of up to - 1.25 V or even negative highly below 0 ℃ . As a result, the potential window can be made even more than 3 V. Furthermore, it also possesses higher current density, fine chemical inertness, anti-pollution strength and antipoisoning ability with much lower background current than other common electrodes from the point of view of the electrochemical reaction. Besides, it has also a strong capacity：in degrading the non-biodegradable pollutants in different organic sewages, such as phenol compounds, dyes, and pesticides, etc. Moreover, hydroxyl radicals are actually directly or indirectly generated by the electrode reactions at the normal temperature and pressure, by which the non-biodegradable pollutants can finally be degraded, the current efficiencies of more than 90 % for water body can be purified with pollutants completely mineralized by using the thin film electrode. Last of all, the paper has also made a discussion over the development and problems with its practical application.