State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Key Laboratory of Yangtze River Water Environment for Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.
Water Res. 2019 Nov 15;165:114930. doi: 10.1016/j.watres.2019.114930. Epub 2019 Jul 30.
Nickel phosphide (NiP) is an emerging efficient catalyst for the hydrogen evolution and water splitting. Herein, we report that NiP is also a promising catalyst for enhancing electrochemical dechlorination of chlorinated disinfection byproducts (DBPs). Amorphous NiP (ANP) mini-nanorod arrays were in-situ fabricated on nickel foam (NF) via a facile phosphidation process, and then used as a binder-free cathode for electrochemical dechlorination of trichloroacetic acid (TCAA). Results showed that ANP exhibited superior performance on electrochemical dechlorination of TCAA than other metal cathodes (e.g., NF and Pd/C). Scavenging experiments and electron spin resonance (ESR) technique indicated that atomic H* was generated from water reduction through ANP catalysis, and primarily contributed to TCAA dechlorination. Indeed, the superhydrophilic surface of ANP favored electrocatalyst/electrolyte contact, and its low impedance further afforded rapid electron transport from the electrode to water or protons for atomic H* generation. The kinetic modelling and mass balance evaluation revealed the transformation mechanism of TCAA dechlorination. This study is among the first to develop ANP as a binder-free cathode for electrochemical dechlorination, and have important implications for eliminating chlorinated DBPs in water.
磷化镍 (NiP) 是一种新兴的高效析氢和水分解催化剂。在此，我们报告称，NiP 也是增强电化学脱氯氯化消毒副产物 (DBPs) 的有前途的催化剂。通过简便的磷化过程，在泡沫镍 (NF) 上原位制备了非晶态 NiP (ANP) 纳米棒阵列，然后将其用作无粘结剂的阴极，用于电化学脱除三氯乙酸 (TCAA)。结果表明，与其他金属阴极（例如 NF 和 Pd/C）相比，ANP 在电化学脱除 TCAA 方面表现出优异的性能。清除实验和电子自旋共振 (ESR) 技术表明，原子 H是通过 ANP 催化从水中还原产生的，主要有助于 TCAA 脱氯。事实上，ANP 的超亲水表面有利于电催化剂/电解质接触，其低阻抗进一步为电子从电极快速传输到水或质子以产生原子 H提供了条件。动力学建模和质量平衡评估揭示了 TCAA 脱氯的转化机制。这项研究首次将 ANP 开发为用于电化学脱氯的无粘结剂阴极，对于消除水中的氯化 DBPs 具有重要意义。
