新型凝胶电极强化铜铅污染黄土电动去除效率的试验及内在机理研究 English Version
Experimental study on electrokinetic removal efficiency of copper-lead contaminated loess enhanced by novel hydrogel electrodes and its inherent mechanism
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摘要: 以人工配制铜铅污染黄土为研究对象，采用团队自制新型凝胶电极并结合电动修复技术，研究污染黄土铜铅离子迁移规律，以EKG和新型凝胶电极为电动修复的对照组，通过采用新型凝胶电极结合不同强化手段的联用方式下，分析试验过程中电动修复参数的演变规律，揭示不同的强化方法对重金属离子去除效率的影响及内在机理。结果表明：酸预处理结合阴极酸碱度的自主调控能够显著降低阴极附近的沉淀现象和降低pH值，致使整个环境体系利于阴阳离子定向迁移，从而提高电流和温度，强化电动修复去除效率，进而表明该方法去除铜铅重金属的有效性及强化去除的可行性，而交换电极与点加酸联用手段显著降低阴极附近离子的聚集问题；基于新型凝胶电极的微观机理，该电极具有极小的电化学极化、低电阻和高导电性等方面的优越性能。因此，本研究提出了一种采用新型凝胶电极结合新的强化手段提高去除效率的方法，并解决电动过程中“电化学极化”和“聚焦效应”问题。Abstract: Taking artificially prepared copper-lead contaminated loess as the research object, a new gel electrode made by the team combined with electrokinetic restoration technology was used to study the migration rule of copper-lead ions in contaminated loess. In the control group of electrokinetic restoration, EKG and a new gel electrode were used in combination with different strengthening methods to analyze the evolution rule of electrokinetic restoration parameters during the experiment. The effect of different strengthening methods on the removal efficiency of heavy metal ions and the internal mechanism were revealed. The results show that: Acid pretreatment combined with the autonomous regulation of the pH of the cathode can significantly reduce the precipitation phenomenon near the cathode and reduce the pH value, resulting in the entire environmental system conducive to the directional migration of cations and ions, thereby increasing the current and temperature, and strengthening the removal efficiency of electrokinetic repair, which further indicates the effectiveness and feasibility of the removal of copper and lead heavy metals by this method. The combination of exchange electrode and point acid can significantly reduce the accumulation of ions near the cathode. Based on the microscopic mechanism of the new gel electrode, the electrode has excellent performance in terms of minimal electrochemical polarization, low resistance and high conductivity. Therefore, a novel gel electrode combined with a new strengthening method is proposed to improve the removal efficiency and solve the problem of "electrochemical polarization and focusing effect of electrode" in electrokinetic process.
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Keywords:
- Loess /
- Electrokinetic remediation /
- Hydrogel electrodes /
- Focusing effect /
- Removal efficiency
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