来自焦化废水的生化尾水的电催化降解,使用带有硫酸盐的粒子电极
Haoran Lu1, Xinyu You1, Tong Yang1
1Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science & Engineering, Beijing Forestry University, Beijing, People's Republic of China.
Environmental technology
|December 2, 2024
概括
这项研究开发了用于焦化废水处理的新型双金属颗粒电极,具有硫酸激活. 尼铁/PAC电极实现了84.4%的降解效率,为工业废水挑战提供了一个有前途的解决方案.
科学领域:
- 环境科学与工程环境科学与工程
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
背景情况:
- 焦化废水由于其复杂和反抗性的有机化合物而带来了重大处理挑战.
- 传统的生物化学治疗方法往往无法满足严格的排放标准.
- 先进的氧化工艺 (AOP) 提供了有效降解污染物的潜力.
研究的目的:
- 研究载有Fe,Co和Ni的粒子电极及其双金属组合 (Ni-Fe,Co-Fe) 的有效性,用于焦化废水处理.
- 评估通过将这些颗粒电极与酸盐 (PS) 激活集成来实现的性能提升.
- 为了优化操作参数,如硫酸盐 (KPS) 剂量,应用电流和Ni:Fe比率,以最大限度地去除污染物和提高能源效率.
主要方法:
- 使用充满单 (Fe,Co,Ni) 和双金属 (Ni-Fe,Co-Fe) 催化剂的活性炭粉 (PAC) 制备颗粒电极.
- 集成的粒子电极系统与硫酸盐 (KPS) 增强氧化.
- 对KPS剂量,电流强度和Ni:Fe比率对降解效率和能源消耗的系统调查.
- 使用循环电压计 (CV) 等技术,对电极材料的表征和降解机制的分析.
主要成果:
- 与单金属对应物相比,双金属颗粒电极表现出优越的性能.
- Ni-Fe/PAC电极实现了最高的降解效率 (84.4%) 和最低的能耗 (19.73 kW·h·kg-1 COD).
- 最佳条件包括5 mmol L-1 KPS,达到61.7%的TOC和84.4%的COD去除.
- 电极表征揭示了特定的金属状态和氧化物构成,Ni-Fe/PAC表现出有利的电化学特性 (低H2进化潜力,高O2进化潜力,大ECSA).
- 降解途径涉及直接的氧化还原反应和间接的氧化 •OH和SO4•-基,对于不同的有机化合物类 ( > 异环 > PAH) 有不同的效率.
结论:
- 开发的Ni-Fe/PAC颗粒电极与硫酸激活相结合,对化废水的处理非常有效.
- 该系统有效降解各种有机污染物,包括化合物,异环化合物和多环芳.
- 这种方法为工业废水整治提供了一个有希望的,节能的解决方案.
相关概念视频
Electrodeposition
597
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
597
Electrolysis
26.0K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.0K
Controlled-Potential Coulometry: Electrolytic Methods
136
Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
The chosen potential...
136
Coagulation
266
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
266
Electrogravimetric Analysis: Overview
202
Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
To test the completeness of the...
202


