Selective phosphate removal using layered double hydroxide/reduced graphene oxide (LDH/rGO) composite electrode in capacitive deionization

Sung Pil Hong; Hansun Yoon; Jaehan Lee; Choonsoo Kim; Seoni Kim; Jiho Lee; Changha Lee; Jeyong Yoon

doi:10.1016/j.jcis.2019.12.068

Selective phosphate removal using layered double hydroxide/reduced graphene oxide (LDH/rGO) composite electrode in capacitive deionization

Sung Pil Hong, Hansun Yoon, Jaehan Lee, Choonsoo Kim, Seoni Kim, Jiho Lee, Changha Lee, Jeyong Yoon

Environmental Science & Engineering

Research output: Contribution to journal › Article › peer-review

61 Scopus citations

Abstract

Phosphate removal is a critical issue in water treatment because excess levels of phosphate can cause severe eutrophication. Capacitive deionization (CDI), which has several advantages, such as simple, eco-friendly, and energy efficient operations, has gained attention as a potential alternative over conventional phosphate removal technologies like activated sludge, chemical precipitation, and adsorption processes. However, CDI suffers from a lack of selectivity for phosphate, resulting from non-selective anion removal of positively biased electrodes. Herein, the layered double hydroxide/reduced graphene oxide (LDH/rGO) composite electrode in the CDI process was examined for selective phosphate removal. LDH/rGO showed the selective phosphate removal performance with sustained phosphate removal efficiency even in the presence of excess chloride. In addition, the selective phosphate removal in the CDI process with the LDH/rGO was successfully demonstrated in the simulated water, fabricated by adding a significantly low concentration of phosphate (0.4 mg∙L⁻¹) into real river water matrix (Han River, Seoul, Korea). This result was explained by the high electrochemical selectivity of the LDH/rGO for phosphate.

Original language	English
Pages (from-to)	1-7
Number of pages	7
Journal	Journal of Colloid and Interface Science
Volume	564
DOIs	https://doi.org/10.1016/j.jcis.2019.12.068
State	Published - 22 Mar 2020

Bibliographical note

Funding Information:
This work was supported by the Technology Innovation Program ( 10082572 , Development of Low Energy Desalination Water Treatment Engineering Package System for Industrial Recycle Water Production) funded by the Ministry of Trade, Industry and Energy , South Korea (MOTIE, Korea), and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT), South Korea ( NRF-2019R1G1A1003336 ). Appendix A

Publisher Copyright:
© 2019 Elsevier Inc.

Keywords

Capacitive deionization
Layered double hydroxide hydroxide/reduced graphene oxide composite
Selective phosphate removal
Water treatment

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10.1016/j.jcis.2019.12.068

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title = "Selective phosphate removal using layered double hydroxide/reduced graphene oxide (LDH/rGO) composite electrode in capacitive deionization",

abstract = "Phosphate removal is a critical issue in water treatment because excess levels of phosphate can cause severe eutrophication. Capacitive deionization (CDI), which has several advantages, such as simple, eco-friendly, and energy efficient operations, has gained attention as a potential alternative over conventional phosphate removal technologies like activated sludge, chemical precipitation, and adsorption processes. However, CDI suffers from a lack of selectivity for phosphate, resulting from non-selective anion removal of positively biased electrodes. Herein, the layered double hydroxide/reduced graphene oxide (LDH/rGO) composite electrode in the CDI process was examined for selective phosphate removal. LDH/rGO showed the selective phosphate removal performance with sustained phosphate removal efficiency even in the presence of excess chloride. In addition, the selective phosphate removal in the CDI process with the LDH/rGO was successfully demonstrated in the simulated water, fabricated by adding a significantly low concentration of phosphate (0.4 mg∙L−1) into real river water matrix (Han River, Seoul, Korea). This result was explained by the high electrochemical selectivity of the LDH/rGO for phosphate.",

keywords = "Capacitive deionization, Layered double hydroxide hydroxide/reduced graphene oxide composite, Selective phosphate removal, Water treatment",

author = "Hong, {Sung Pil} and Hansun Yoon and Jaehan Lee and Choonsoo Kim and Seoni Kim and Jiho Lee and Changha Lee and Jeyong Yoon",

note = "Funding Information: This work was supported by the Technology Innovation Program ( 10082572 , Development of Low Energy Desalination Water Treatment Engineering Package System for Industrial Recycle Water Production) funded by the Ministry of Trade, Industry and Energy , South Korea (MOTIE, Korea), and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT), South Korea ( NRF-2019R1G1A1003336 ). Appendix A Publisher Copyright: {\textcopyright} 2019 Elsevier Inc.",

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AU - Hong, Sung Pil

AU - Yoon, Hansun

AU - Lee, Jaehan

AU - Kim, Choonsoo

AU - Kim, Seoni

AU - Lee, Jiho

AU - Lee, Changha

AU - Yoon, Jeyong

N1 - Funding Information: This work was supported by the Technology Innovation Program ( 10082572 , Development of Low Energy Desalination Water Treatment Engineering Package System for Industrial Recycle Water Production) funded by the Ministry of Trade, Industry and Energy , South Korea (MOTIE, Korea), and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT), South Korea ( NRF-2019R1G1A1003336 ). Appendix A Publisher Copyright: © 2019 Elsevier Inc.

PY - 2020/3/22

Y1 - 2020/3/22

N2 - Phosphate removal is a critical issue in water treatment because excess levels of phosphate can cause severe eutrophication. Capacitive deionization (CDI), which has several advantages, such as simple, eco-friendly, and energy efficient operations, has gained attention as a potential alternative over conventional phosphate removal technologies like activated sludge, chemical precipitation, and adsorption processes. However, CDI suffers from a lack of selectivity for phosphate, resulting from non-selective anion removal of positively biased electrodes. Herein, the layered double hydroxide/reduced graphene oxide (LDH/rGO) composite electrode in the CDI process was examined for selective phosphate removal. LDH/rGO showed the selective phosphate removal performance with sustained phosphate removal efficiency even in the presence of excess chloride. In addition, the selective phosphate removal in the CDI process with the LDH/rGO was successfully demonstrated in the simulated water, fabricated by adding a significantly low concentration of phosphate (0.4 mg∙L−1) into real river water matrix (Han River, Seoul, Korea). This result was explained by the high electrochemical selectivity of the LDH/rGO for phosphate.

AB - Phosphate removal is a critical issue in water treatment because excess levels of phosphate can cause severe eutrophication. Capacitive deionization (CDI), which has several advantages, such as simple, eco-friendly, and energy efficient operations, has gained attention as a potential alternative over conventional phosphate removal technologies like activated sludge, chemical precipitation, and adsorption processes. However, CDI suffers from a lack of selectivity for phosphate, resulting from non-selective anion removal of positively biased electrodes. Herein, the layered double hydroxide/reduced graphene oxide (LDH/rGO) composite electrode in the CDI process was examined for selective phosphate removal. LDH/rGO showed the selective phosphate removal performance with sustained phosphate removal efficiency even in the presence of excess chloride. In addition, the selective phosphate removal in the CDI process with the LDH/rGO was successfully demonstrated in the simulated water, fabricated by adding a significantly low concentration of phosphate (0.4 mg∙L−1) into real river water matrix (Han River, Seoul, Korea). This result was explained by the high electrochemical selectivity of the LDH/rGO for phosphate.

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KW - Layered double hydroxide hydroxide/reduced graphene oxide composite

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Selective phosphate removal using layered double hydroxide/reduced graphene oxide (LDH/rGO) composite electrode in capacitive deionization

Abstract

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Keywords

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