Bi-TiO2纳米管阵列电极对水中硝酸盐的去除

为研究电化学技术对硝酸盐氮的去除作用，本实验以TiO₂纳米管（TiO₂-NT）为基体，利用电沉积法制备了Bi-TiO₂纳米管阵列电极（Bi-TNA）.同时，采用X-射线衍射仪（XRD）、扫描电子显微镜（SEM）对电极涂层表面形貌和晶体结构进行表征，并分析了电流密度、pH、初始浓度对硝态氮去除、亚硝态氮和氨氮转换、总氮去除及氮气选择性的影响.最后分析了Bi-TNA电极对硝态氮去除的动力学模型.结果表明，在单因素水平下，最佳操作条件为：硝态氮浓度为50 mg·L^-1，电流密度为30 mA·cm^-2，pH值为8.5.Bi-TNA电极对硝态氮的还原过程都遵循一级反应动力学.

Removal of nitrate in water by Bi-TiO2 nanotube array electrodes

In order to study the nitrogen removal performance of electrochemical technology, Bi-TiO₂ nanotube arrays were prepared by electrodeposition method with TiO₂ nanotubes as substrates. X-ray diffractometer (XRD) and scanning electron microscope (SEM) were used to characterize the surface morphology and crystal structure of the electrode coating. The influence of current density, pH, initial concentration on nitrate removal rate, nitrite and ammonia conversion quantity, the removal of total nitrogen and the selectivity of nitrogen was analyzed. Finally, the kinetic model of Bi-TNA electrode for nitrate nitrogen removal is analyzed. The results indicated that under the single factor level, the optimal operating conditions was 50 mg·L^-1 nitrate, current density of 30 mA·cm^-2, pH value of 8.5. The reduction process of nitrate by Bi-TNA electrode followed the first-order reaction kinetics.