A novel two-stage continuous capacitive deionization system with connected flow electrode and freestanding electrode

Chen，Rui1,2; Liu，Xun1,2,3; Wang，Mengxia1,2,3; Shu，Yufei1,2; Zhang，Meng1,2; Liu，Bei1,2; Wang，Zhongying1,2

2024-07-01

10.1016/j.cej.2024.152133

Chemical Engineering Journal   影响因子和分区

1385-8947

The desalination of seawater/wastewater utilizing flow-electrode capacitive deionization (FCDI) has received significant interest. However, challenges like the low electrical conductivity of flow electrode and excessive energy consumption have prevented the scaling up of desalination operations. To overcome these issues, this study introduces a new FCDI system termed the two-stage FCDI (TS-FCDI) system, in which desalination modules are equipped with freestanding and flow electrode. The TS-FCDI system offers a graded desalination module design that produces an average salt removal rate (ASRR) of 113 µg cm·min. However, the TS-FCDI system requires substantially reduced infrastructure investment, device size, and energy expenses. Notably, the design allows for the simultaneous operation of freestanding and flow electrode and enables the transport of ions and charges in the electrode region. Experimental evidence from multiple device configurations (CDI, FCDI, and TS-FCDI) supports this claim. Notably, the TS-FCDI system shows about twice the desalination performance over FCDI, with approximately 50 h of single-cycle (SC) operation. This enhancement links the freestanding electrode with the flow electrode, enabling the device to be well-suited for practical applications. The continuous flow of electrode particles in contact with the freestanding electrode initiates secondary ion transport, merging two different types of electrodes to enhance the active space of the electrode, effectively improving ion adsorption performance. In summary, the results of this study indicate the potential of the TS-FCDI system as a suitable desalination technology for scaling up applications.

Carbon cloth Flow-electrode capacitive deionization Nickel foam Scale-up desalination Two-stage

SCI ; EI

英语

第一 ; 通讯

20242116151270

Carbon ; Desalination ; Energy utilization ; Foams ; Investments ; Ions ; Nickel

Water Treatment Techniques:445.1 ; Energy Utilization:525.3 ; Nickel:548.1 ; Chemical Products Generally:804

ENGINEERING

2-s2.0-85193900928

Scopus

1.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.School of Environment,Harbin Institute of Technology,Harbin,150086,China

Chen，Rui,Liu，Xun,Wang，Mengxia,et al. A novel two-stage continuous capacitive deionization system with connected flow electrode and freestanding electrode[J]. Chemical Engineering Journal,2024,491.

Chen，Rui.,Liu，Xun.,Wang，Mengxia.,Shu，Yufei.,Zhang，Meng.,...&Wang，Zhongying.(2024).A novel two-stage continuous capacitive deionization system with connected flow electrode and freestanding electrode.Chemical Engineering Journal,491.

Chen，Rui,et al."A novel two-stage continuous capacitive deionization system with connected flow electrode and freestanding electrode".Chemical Engineering Journal 491(2024).