Capacitive Deionization Technology for Water Treatment

Topic Information

Dear Colleagues,

Capacitive deionization (CDI) is an emerging water purification technology, where the direct voltage applied on the electrodes enables ions or charged particles to form electric double layers (EDLs) on the surface of electrodes for the purpose of water purification. At present, capacitive deionization has been widely used in industrial, agricultural, and domestic water desalination and seawater desalination. The advantages of CDI are characterized by low energy consumption, environmental friendliness, high adsorption efficiency, and easy operation.

In addition to research on the adsorption efficiency of CDI, another fundamental research challenge, still unresolved as of today, is how to improve the adsorption selectivity of CDI—a challenge closely related to the separation, purification, and enrichment of ions in complex solutions.

Prof. Dr. Shenxu Bao
Dr. Xin Zhang
Topic Editors

Keywords

Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
AppliedChem appliedchem	-	-	2021	18.8 Days	CHF 1000
ChemEngineering ChemEngineering	2.8	4.0	2017	32.8 Days	CHF 1600
Energies energies	3.0	6.2	2008	16.8 Days	CHF 2600
Membranes membranes	3.3	6.1	2011	14.9 Days	CHF 2200
Processes processes	2.8	5.1	2013	14.9 Days	CHF 2400
Recycling recycling	4.6	6.8	2016	20.9 Days	CHF 1800
Separations separations	2.5	3.0	2014	15.1 Days	CHF 2600
Water water	3.0	5.8	2009	17.5 Days	CHF 2600

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Published Papers (3 papers)

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All AppliedChem ChemEngineering Energies Membranes Processes Recycling Separations Water

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17 pages, 3996 KiB  

Open AccessArticle

Combination of Precipitation-Adsorption-Bipolar Membrane Electrodialysis for Mine Water Treatment

by Xiujuan Feng, Du Cen and Yonghui Wu

Water 2024, 16(11), 1474; https://doi.org/10.3390/w16111474 - 22 May 2024

Cited by 1 | Viewed by 1702

Abstract

The process of mining produces a large amount of heavy metals and high-sulfate mine water, which is the main factor leading to environmental degradation in the mining area, and the removal of heavy metals and the recovery of sulfate from mine water is [...] Read more.

The process of mining produces a large amount of heavy metals and high-sulfate mine water, which is the main factor leading to environmental degradation in the mining area, and the removal of heavy metals and the recovery of sulfate from mine water is a difficult problem faced by mines today. Currently, sulfate is treated as a hazardous substance and is not recycled. In this paper, the precipitation–adsorption bipolar membrane electrodialysis (BMED) multi-technology-coupled recovery of sulfate method was used to treat mine water. The results showed that the coupling technology could remove heavy metals and sulfate in water better, while the sulfate desalination rate was about 96.8%, current efficiency was 54.2%, energy consumption was 0.823 kWh/kg, and the acid production concentration was 0.168 at an electrolyte concentration of 0.1 mol/L, an operating voltage of 12 V, an initial salt concentration of 30 g/L, and a flow rate of 3.5 mL/min. Mechanistic results showed that the precipitation–adsorption method could realize the removal of heavy metals from mine water. The BMED process realized the removal of sulfate and also the recovery of acid. The multi-technology coupling of precipitation–adsorption and bipolar membrane electrodialysis explored in this paper provides a direction for the in-depth treatment of mine water. Full article

(This article belongs to the Topic Capacitive Deionization Technology for Water Treatment)

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16 pages, 13903 KiB  

Open AccessArticle

Research on CeO₂ Activated Carbon Electrode Capacitance Method for Sulfate Removal from Mine Water

by Xiujuan Feng, Yanjun Zou, Sékou Mohamed Condé, Xiaoqing Wang and Chengliang Dong

Water 2024, 16(5), 675; https://doi.org/10.3390/w16050675 - 25 Feb 2024

Cited by 1 | Viewed by 1960

Abstract

Sulfate is a typical characteristic pollutant in mine water. Because of its high concentration and large discharge of mine water, it has become a difficult problem in mineral exploitation. Capacitive deionization (CDI) is an innovative and economical removal technology. There are few reports [...] Read more.

Sulfate is a typical characteristic pollutant in mine water. Because of its high concentration and large discharge of mine water, it has become a difficult problem in mineral exploitation. Capacitive deionization (CDI) is an innovative and economical removal technology. There are few reports on the use of CDI to remove SO₄²⁻ from mine water. In this study, a CeO₂ activated carbon electrode with good wettability, excellent electrochemical performance, and suitable pore structure was prepared by the sol-gel method. The application of the CeO₂ activated carbon electrode to the capacitive method for treating high SO₄²⁻ mine water was investigated using simulated wastewater and actual mine water. The study structure shows that CeO₂:activated carbon (AC) has the best wettability, the highest specific capacitance, and the lowest electrical conductivity when the mass ratio of CeO₂ is 5%. At 100 mg/L, the electrode has the maximum SO₄²⁻ ion specific adsorption capacity (SAC). At 1 V and 20 mL/min, this value is measured. The electrode has a SAC value of 9.36 mg/g, far higher than the AC electrode’s 4.1 mg/g. The effect of CDI process factors such the voltage, flow rate, and initial concentration was studied to find the best treatment method. SAC retention is 91% after 10 adsorption–desorption cycles, demonstrating outstanding electrode performance. Under the best CDI process (1.4 volts, 30 mL/min), mine water was treated. After 20 cycles of treatment, the concentration of SO₄²⁻ in mine water decreased from 1170 mg/L to 276.46 mg/L, and the removal rate was 76.37%. This study proved that the CeO₂ modified activated carbon electrode capacitance method can effectively remove sulfate ions and other ions from mine water. Full article

(This article belongs to the Topic Capacitive Deionization Technology for Water Treatment)

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24 pages, 3852 KiB  

Open AccessReview

Application of Capacitive Deionization in Water Treatment and Energy Recovery: A Review

by Shenxu Bao, Chunfu Xin, Yimin Zhang, Bo Chen, Wei Ding and Yongpeng Luo

Energies 2023, 16(3), 1136; https://doi.org/10.3390/en16031136 - 19 Jan 2023

Cited by 53 | Viewed by 7880

Abstract

Water resources are the basis for human survival and development. However, human beings face severe challenges of water pollution and freshwater shortage. With the critical advantages of low energy consumption, high efficiency, low cost, green and pollution-free, and renewable electrodes, capacitive deionization (CDI) [...] Read more.

Water resources are the basis for human survival and development. However, human beings face severe challenges of water pollution and freshwater shortage. With the critical advantages of low energy consumption, high efficiency, low cost, green and pollution-free, and renewable electrodes, capacitive deionization (CDI) has become an up-and-coming water treatment technology. After decades of development, the application of CDI has expanded from seawater desalination to many fields. However, the existing literature still needs a comprehensive overview of the multi-functional application of CDI technology in water treatment. Therefore, our work critically reviewed the latest research progress of CDI in water treatment to meet the technical requirements of various application fields. This paper first summarizes the various applications of CDI in water treatment, focusing on CDI’s representative research results in heavy metal removal, organic contaminants removal, water softening, phosphate and nitrate removal, and water disinfection. In addition, we also discussed the latest research progress of energy recovery and energy consumption assessment for the CDI process. Finally, this paper discusses the challenges and future opportunities facing CDI technology. Full article

(This article belongs to the Topic Capacitive Deionization Technology for Water Treatment)
(This article belongs to the Section B: Energy and Environment)

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