Selective reduction of nitrate to ammonium over charcoal electrode derived from natural wood
Selective reduction of nitrate to ammonium over charcoal electrode derived from natural wood
复制标题
通过天然木材制成的木炭电极将硝酸盐选择性还原为铵
DOI：
10.1016/j.chemosphere.2021.131501
复制
发表时间：
2021
期刊：
影响因子：
8.8
通讯作者：
Hongtao Yu
中科院分区：
文献类型：
--
作者：
Xue Li;Yuwei Gu;Shuai Wu;Shuo Chen;Xie Quan;Hongtao Yu
电催化硝酸盐还原被认为是合成氨的有效替代途径。开发高效、经济和环境友好的阴极是该方法实际应用的一个重要问题。在这里，我们报道了一种碳化天然木材制成的用于高效还原硝酸盐的木炭电极。它具有高的析氢过电位、中等的Sp3c结构和含氧表面基团。得益于这些特点，炭阴极对氨氮具有高的硝酸盐去除效率(91.2%)、突出的选择性(98.5%)和快速的生成速率(0.570−−1h−1 cm−2)。其脱色率和选择性均优于其他炭材料，可与含金属阴极媲美。这些结果表明，木炭作为阴极用于废水中的脱氮和氨回收是可能的。
Electrocatalytic nitrate reduction has been regarded as an efficient alternative route for ammonia production. Developing efficient, economical and environment-friendly cathodes is a significant concern for the practical applications of this method. Herein, we report a charcoal electrode fabricated by carbonizing natural wood for efficient nitrate reduction. It displays high overpotential for hydrogen evolution, moderate sp3C structure and oxygen-containing surface groups. Benefiting from these features, the charcoal cathode exhibits high nitrate removal rate (91.2%), outstanding selectivity (98.5%) and fast production rate (0.570 mmol L−1h−1cm−2) for ammonium. Both removal rate and selectivity are superior to other carbon materials and comparable to metal-containing cathodes. These results exhibit the possibility of using charcoal as cathodes for denitrification and ammonia recovery from wastewater.