相关实验视频
Updated: Jun 28, 2025

09:50
Electrochemically and Bioelectrochemically Induced Ammonium Recovery
Published on: January 22, 2015
12.7K
洞察EDTA辅助的在交流电流下清洗土壤污水的电化学过程
Jiating Huang1, Xin Xiao1, Baoliang Chen1
1Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang 310058, China.
Journal of hazardous materials
|April 16, 2024
概括
这项研究引入了一种先进的电化学方法,使用交流电 (AC) 来有效地从土壤洗废水中去除重金属,同时回收乙烯二胺酸 (EDTA). 新技术显著提高了EDTA的回收和可重复使用性,为土壤整治提供了可持续的解决方案.
科学领域:
- 环境化学环境化学
- 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:
- 乙二胺四酸 (EDTA) 是重金属修复中的一个关键化剂.
- 电化学沉积显示出对处理土壤洗废水的希望.
- 在先进的电化学条件下,EDTA的稳定性和回收性需要进一步研究.
研究的目的:
- 研究交流电 (AC) 与直流电 (DC) 电化学技术对EDTA稳定性和恢复的影响.
- 开发一种有效的方法,同时从土壤洗废水中去除重金属和EDTA回收.
- 提高EDTA和石墨阳极在土壤修复应用中的可重复使用性.
主要方法:
- 使用双室电解电池与交流电源供电.
- 分析了Cu,Pb和Cd的重金属去除效率.
- 采用X射线光电子光谱 (XPS) 和拉曼光谱来研究阳极表面变化.
- 进行了长期实验,以评估EDTA的循环利用性和阳极耐用性.
主要成果:
- 与DC相比,AC显示出更好的重金属去除能力.
- 主要观察到EDTA的分解主要发生在阳解质中.
- 使用交流电和双室电池,EDTA回收效率从47%提高到96.8%.
- 电流处理增强了石墨阳极的氧化表面,减少了EDTA分解.
- 该策略实现了20个EDTA循环,回收效率为84%,电极腐蚀最小.
结论:
- 开发的基于AC的电化学策略显著改善了重金属的去除和土壤洗废水中的EDTA回收.
- 这种方法提高了EDTA的可重复使用性和阳极的耐用性,为土壤整治提供了可持续和具有成本效益的解决方案.
- 这些发现为优化基于酸盐的环境修复应用提供了宝贵的见解.
相关概念视频
EDTA: Auxiliary Complexing Reagents
583
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
583
Electrolysis
26.3K
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...
26.3K
Controlled-Current Coulometry: Overview
201
Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
201
Electrogravimetric Analysis: Overview
225
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...
225
Electrodeposition
633
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...
633
Interfacial Electrochemical Methods: Overview
240
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
240

