Photoelectrocatalytic Removal Of Nitrogen-Containing Compounds Using Titania Dioxide Nanotube Electrode And Recovery Of Heavy Metals Via Cathode

With the development of the industry and agriculture,the nitrous compounds has been increased rapidly.And ammonia nitrogen has been become the master pollutant which draws general concern of the international community.Researching a kind of economicaland efficient method becomes a hot and important spot in the field of water pollution treatment.Due to the strong stability of heavy metal,heavy metal complexes can enhance the migration of heavy metals and cause a wider range of heavy metals pollution.Conventional water treatment technology can not effectively treat such complexes,so this paper aims to explore a method to effectively deal with heavy metal complexes and achieve recovery of heavy metals.Titanium dioxide nanotube array electrode was prepared by the anodic oxidation process using cyclic voltammetry method.The results show that the TiO₂ nanotube array electrode has a good stability.Following,the Titanium dioxide nanotube array electrode was used as photoanode and the titanium sheet was used as cathode to remove ammonia nitrogen of different kinds in the wastewater.Simultaneously,the Ni²⁺ ions were recovered by electrodeposition process at cathode.The conditional experiments were also conducted.In this paper,the ammonia nitrogen degradation products were analyzed.Most of the total ammonia nitrogen degradation products into N₂ in photoelectrocatalytic process.The photoelectrochemical oxidative mechanism of ammonia nitrogen may provide a theoretical foundation to realize industrialization.The degradation pathway was speculated.Hydroxyl radical（·OH）proved to be the main oxidant on decomplexation,Ni²⁺ reduction process on cathode was analyzed with the XPS.