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首页> 外文期刊>Separation and Purification Technology >Electrochemical removal of nitrate using a nanosheet structured Co3O4/Ti cathode: Effects of temperature, current and pH adjusting
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Electrochemical removal of nitrate using a nanosheet structured Co3O4/Ti cathode: Effects of temperature, current and pH adjusting

机译：使用纳米片结构化CO3O4 / TI阴极进行硝酸盐的电化学除去：温度，电流和pH调节的影响

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摘要

Co3O4 nanosheet film is synthesized through electrodeposition and used as cathode in electrochemical NO3- removal. The electrodeposition conditions are optimized and the NO3- removal rate is enhanced by 1.7 times in comparison with Co3O4 solid particle cathode, which mainly results from its large surface area and high efficient electron transfer and utilization capacities. The effects of reaction temperature and current are then deeply investigated. NO3- removal rate is enhanced from 0.00667 min(-1) to 0.0156 min(-1) at 0.08 A with reaction temperature rising from 5 degrees C to 45 degrees C, and it can further be enhanced to 0.0220 min(-1) with current increasing to 0.16 A. Furthermore, the physical properties of Co3O4 nanosheet cathode are more stable during the reaction at high temperature. Low reaction temperature not only destroys nanosheet structure, but also changes the ratio of Co2+/Co3+ and the numbers of oxygen vacancy and lattice oxygen. Almost 60% TN removal is obtained under 0.16 A at 45 degrees C, however, most of which is obtained through NH3 escape instead of N-2 generation. Adjusting the pH around neutral condition during the reaction can effectively fix NH3 in solution. The NH3 can then be oxidized to N-2 in the presence of certain amount of Cl-.
机译：CO3O4纳米片薄膜通过电沉积合成，用作电化学NO3-除去的阴极。与CO3O4固体颗粒阴极相比，优化电沉积条件并通过其大表面积和高效电子转移和利用能力来增强1.7倍的NO 3除去速率。然后深入研究反应温度和电流的影响。从0.00667 min（-1）至0.0156 min（-1）以0.08A的反应温度从5摄氏度上升至45℃，并且进一步增强至0.0220 min（-1）电流增加到0.16 A.此外，在高温下反应期间CO3O4纳米片阴极的物理性质更稳定。低反应温度不仅破坏了纳米片结构，而且还会改变CO2 + / CO3 +的比率和氧气空位的数量和氧气氧。然而，在45摄氏度下，在0.16A下获得几乎60％的去除除去，其大多数通过NH3逃逸而不是N-2代而获得。在反应过程中调节pH周围的中性条件可以有效地固定溶液中的NH 3。然后可以在存在一定量的Cl-存在下氧化至N-2的NH 3。

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