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以Pt为阳极,Cu修饰的Ti纳米管(Cu-TiNT)为阴极构建电化学反应器进行硝酸盐氮(NO_3~--N)的去除研究,考察了不同初始浓度、电流密度、反应温度和pH值对NO_3~--N去除率的影响,并考察了NaCl添加量对铵氮(NH_4~+-N)和亚硝酸氮(NO-2-N)生成量的影响。结果表明,利用Cu修饰的Ti纳米管阴极Cu-TiNT可获得较好的NO_3~--N去除效果;在酸性条件下,NO_3~--N的去除效果更好;随着电流密度和温度的增高,NO_3~--N的去除效率也随之提高;而随着溶液初始浓度的升高,NO_3~--N的去除率反而略有下降;在溶液中添加0.3g/L的NaCl,电解120min后NO_3~--N的去除率达到97.9%,产生的NH_4~+-N和NO-2-N几乎为0。
The removal of nitrate nitrogen (NO_3 ~ - N) by Pt as anode and Cu-Ti nanotubes as cathode was studied. The effects of different initial concentration, current density, reaction temperature and pH on the NO_3 ~ - N removal rate was investigated. The effects of NaCl addition on the production of ammonium nitrogen (NH_4 ~ + -N) and nitrous oxide (NO_2-N) were also investigated. The results show that the removal of NO_3 ~ --N by Cu-TiNT cathode modified with Cu is better than that of Cu-TiNT cathode. Under acidic conditions, NO_3 ~ -N removal efficiency is better. With the increase of current density and temperature While the removal efficiency of NO_3 ~ - N also increased. With the increase of the initial concentration of the solution, however, the NO_3 ~ -N removal rate decreased slightly. Adding 0.3g / L NaCl to the solution, After 120min, the removal rate of NO_3 ~ --N reached 97.9%, and the produced NH_4 ~ + -N and NO-2-N were almost zero.