College of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
J Environ Sci (China). 2025 Feb;148:38-45. doi: 10.1016/j.jes.2024.01.007. Epub 2024 Jan 16.
Nitrate (NO) is a widespread pollutant in high-salt wastewater and causes serious harm to human health. Although electrochemical removal of nitrate has been demonstrated to be a promising treatment method, the development of low-cost electro-catalysts is still challenging. In this work, a phosphate modified iron (P-Fe) cathode was prepared for electrochemical removal of nitrate in high-salt wastewater. The phosphate modification greatly improved the activity of iron, and the removal rate of nitrate on P-Fe was three times higher than that on Fe electrode. Further experiments and density functional theory (DFT) calculations demonstrated that the modification of phosphoric acid improved the stability and the activity of the zero-valent iron electrode effectively for NO removal. The nitrate was firstly electrochemically reduced to ammonium, and then reacted with the anodic generated hypochlorite to N. In this study, a strategy was developed to improve the activity and stability of metal electrode for NO removal, which opened up a new field for the efficient reduction of NO removal by metal electrode materials.
硝酸盐（NO）是高盐废水中的一种广泛存在的污染物，对人类健康造成严重危害。尽管电化学去除硝酸盐已被证明是一种很有前途的处理方法，但开发低成本的电催化剂仍然具有挑战性。在这项工作中，制备了一种磷酸盐修饰的铁（P-Fe）阴极，用于电化学去除高盐废水中的硝酸盐。磷酸盐修饰极大地提高了铁的活性，P-Fe 上的硝酸盐去除率是 Fe 电极的三倍。进一步的实验和密度泛函理论（DFT）计算表明，磷酸的修饰有效地提高了零价铁电极的稳定性和活性，有利于去除 NO。硝酸盐首先被电化学还原为铵，然后与阳极产生的次氯酸盐反应生成 N。在本研究中，开发了一种提高金属电极去除 NO 活性和稳定性的策略，为金属电极材料高效去除 NO 开辟了新的领域。
