通过可回收的氧化物阴极进行电化学脱:快速回收和选择性催化
Yiwen Chen1, Junguo He2, Heliang Pang1
1State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, PR China.
Journal of hazardous materials
|November 4, 2023
概括
这项研究开发了一种具有成本效益的,可回收的纳米孔状氧化物/阴极,用于电化学脱. 可持续的电极设计大大降低了催化剂的消耗,为废水处理提供了一个新的解决方案.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 环境工程 环境工程
背景情况:
- 阴极老化和污染是工程应用电化学脱化的主要挑战.
- 由于催化剂的消耗,现有的基阴极面临成本效益和可持续性的问题.
研究的目的:
- 开发一种经济且可回收的纳米孔状氧化物/ (Co3O4/Co) 阴极,用于电化学酸盐降解.
- 调查废水处理所开发的阴极的可持续性和成本效益.
主要方法:
- 使用化方法制造一个纳米多孔的Co3O4/Co阴极.
- 阴极结构和组成的特征,包括表面的CO2+离子.
- 密度函数理论 (DFT) 计算以确定酸盐减少的热力学优势.
- 评估实际废水处理中的电极性能,测量总 (TN) 和酸盐 (NO3-) 的去除.
主要成果:
- 开发的阴极表现出了特殊的可持续性,可以回收再生,实现了低催化剂消耗1.936g/kg N.
- DFT的计算证实了酸盐降解 (自由能量为-0.89 eV) 的有利结合,并确定了CO2+作为关键的电子载体.
- 尽管能源障碍导致了高氨选择性 (90.02%),但阴极实现了显著的废水处理,在3小时内去除了78%的TN和93%的NO3.
结论:
- 基于化的策略为电化学脱提供了高成本效益和可持续的电极.
- 这种方法为环境应用中的电极可持续性提供了一个新的范式.
- 开发的Co3O4/Co阴极为废水处理中高效的酸盐去除提供了可行的解决方案.
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