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过程工程学报 ›› 2021, Vol. 21 ›› Issue (8): 976-984.DOI: 10.12034/j.issn.1009-606X.220188

• 环境与能源 • 上一篇    下一篇

电吸附-电沉积联合作用下的低浓度铜离子分离

胡美清1， 金伟1,2*   

  1. 1. 同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室，上海 200092

    2. 中国科学院过程工程研究所，北京 100190

  • 收稿日期:2020-06-16 修回日期:2020-08-26 出版日期:2021-08-28 发布日期:2021-08-24
  • 通讯作者: 金伟 wjin@ipe.ac.cn
  • 基金资助:
    旋流电解强化蚀刻废液再生的动态调控机制

Separation of low-concentration copper ions via the joint effect of electro-sorption and electrodeposition

Meiqing HU1,  Wei JIN1,2*   

  1. 1. State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China

    2. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

  • Received:2020-06-16 Revised:2020-08-26 Online:2021-08-28 Published:2021-08-24

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摘要： 对于酸性低浓度含铜废水中铜离子回收，直接采用电沉积方法不仅效率低、耗时长、而且产品质量差。为了实现低浓度含铜废水高效分离回收，本研究提出了一种电吸附-电沉积联合新方法，首先使用电吸附方法，使铜离子浓度由30 mg/L浓缩至500 mg/L，然后接入旋流电解装置，在电压0.25 V、电流密度150 A/m2下，99%的铜离子以铜产品形式得到回收，且能量消耗仅为1.35×10?2 kW/h。这种通过两种电化学方法联用的思路，对于处理低浓度金属废水以及回收金属离子具有良好发展前景。

关键词: 铜回收, 电吸附, 旋流电解, 分离

Abstract: Due to the significant importance in modern electronic devices and chemical products manufacture, considerable copper ions have been discharged into the global environment, which requires an effective way to remove and recover. Many conventional techniques have been explored, such as solvent extraction, ion exchange and precipitation. It has been demonstrated that electrodeposition is a promising way to recover copper ions as metallic products, however, it is difficult to directly use electrodeposition for copper recovery in acidic low-concentration copper-containing wastewater due to the performance of inefficient and time-consuming with low-quality products. To achieve efficient separation in the dilute wastewater system, a new stepwise method of electro-sorption and electrodeposition was proposed in this study. Initially, the ACF/CoS had been readily prepared as the low-cost and stable electrode, presenting excellent properties of a larger specific surface area of 33.2 m2/g and specific capacitance of 141.2 F/g at 5 mV/s. It can effectively recovery copper ions by electro-sorption method within 90 min, and the copper ion was concentrated from 30 mg/L to 500 mg/L after desorption and concentration process. Subsequently, it was connected to the turbulent reactor for enhanced electrodeposition, to overcome the bottlenecks of concentration polarization. The results showed that under the voltage of 0.25 V and the current density of 150 A/cm2, the recovery of copper ion can reach 99%, and the energy consumption was only 1.35×10?2 kW/h, which was 50% and 15% lower than the traditional electrodeposition and enhanced electrodeposition under the voltage of 0.40 V. Consequently, with the efforts of the effective electrode and improved mass transfer, the joint method of electro-sorption and electrodeposition exhibits a good prospect for the efficient treatment of low concentration metal wastewater and the recovery of low concentration metal ions.

Key words: Copper recovery, Electro-sorption, Turbulent reactor, Separation