Activated carbon recycled from bitter-tea and palm shell wastes for capacitive desalination of salt water

P. A. Chen, H. C. Cheng, Hong-Paul Wang

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Capacitive deionization (CDI) has been considered as a low energy consumption, economically attractive and environmental friendly method for desalination of salt water. Generally, the electrode materials play the key role in CDI. In the present work, representative activated carbons (ACs) recycled from bitter-tea and palm shell wastes (denoting BAC and PAC, respectively) were used as the CDI electrodes. To provide additional disinfection ability during CDI of salt water, Ag@C core-shell nanoparticles prepared from carbonization of Ag+-cyclodextrin complexes at 673 K were dispersed on the AC electrodes. By FTIR, it seems that the ACs have the less oxygen on their surfaces with more aromatic contents if the compared with the shell wastes as the carbon sources. Electrosorption efficiencies during the one-through CDI of a salt water ([NaCl] = 1000 ppm) using the BAC and PAC electrodes at +1.2 V are 25 and 28%, respectively. As the voltage is increased to +1.6 V, the electrosorption efficiencies and recovery performances of the PAC and Ag@C/PAC electrodes during the repeated CDI tests (+1.6 V → 0 V → +1.6 V) are similar to those operated at 1.2 V. However, after the potential polarity is reversed (+1.6 V to −1.6 V), their electrosorption efficiencies are considerably increased (capable of 40%). The ACs dispersed with the Ag@C nanoparticles (Ag@C/AC) has less contact angles, giving a better hydrophilicity. High disinfection abilities (95–98%) for the Ag@C/ACs electrodes during the 2-h CDI reaction can be obtained. This work exemplifies that the ACs recycled from shell wastes as CDI electrodes for desalination of salt water are chemically feasible. In addition, the AC-based CDI electrodes dispersed with Ag@C core-shell nanoparticles have additional disinfection ability during desalination of salt water.

Original languageEnglish
Pages (from-to)927-932
Number of pages6
JournalJournal of Cleaner Production
Volume174
DOIs
Publication statusPublished - 2018 Jan 20

Fingerprint

Saline water
tea
salt water
Desalination
desalination
Activated carbon
activated carbon
electrode
shell
Electrodes
Disinfection
disinfection
Nanoparticles
Tea
Salt
Carbon
Water
Shell
Cyclodextrins
Carbonization

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)
  • Strategy and Management
  • Industrial and Manufacturing Engineering

Cite this

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title = "Activated carbon recycled from bitter-tea and palm shell wastes for capacitive desalination of salt water",
abstract = "Capacitive deionization (CDI) has been considered as a low energy consumption, economically attractive and environmental friendly method for desalination of salt water. Generally, the electrode materials play the key role in CDI. In the present work, representative activated carbons (ACs) recycled from bitter-tea and palm shell wastes (denoting BAC and PAC, respectively) were used as the CDI electrodes. To provide additional disinfection ability during CDI of salt water, Ag@C core-shell nanoparticles prepared from carbonization of Ag+-cyclodextrin complexes at 673 K were dispersed on the AC electrodes. By FTIR, it seems that the ACs have the less oxygen on their surfaces with more aromatic contents if the compared with the shell wastes as the carbon sources. Electrosorption efficiencies during the one-through CDI of a salt water ([NaCl] = 1000 ppm) using the BAC and PAC electrodes at +1.2 V are 25 and 28{\%}, respectively. As the voltage is increased to +1.6 V, the electrosorption efficiencies and recovery performances of the PAC and Ag@C/PAC electrodes during the repeated CDI tests (+1.6 V → 0 V → +1.6 V) are similar to those operated at 1.2 V. However, after the potential polarity is reversed (+1.6 V to −1.6 V), their electrosorption efficiencies are considerably increased (capable of 40{\%}). The ACs dispersed with the Ag@C nanoparticles (Ag@C/AC) has less contact angles, giving a better hydrophilicity. High disinfection abilities (95–98{\%}) for the Ag@C/ACs electrodes during the 2-h CDI reaction can be obtained. This work exemplifies that the ACs recycled from shell wastes as CDI electrodes for desalination of salt water are chemically feasible. In addition, the AC-based CDI electrodes dispersed with Ag@C core-shell nanoparticles have additional disinfection ability during desalination of salt water.",
author = "Chen, {P. A.} and Cheng, {H. C.} and Hong-Paul Wang",
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Activated carbon recycled from bitter-tea and palm shell wastes for capacitive desalination of salt water. / Chen, P. A.; Cheng, H. C.; Wang, Hong-Paul.

In: Journal of Cleaner Production, Vol. 174, 20.01.2018, p. 927-932.

Research output: Contribution to journalArticle

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AB - Capacitive deionization (CDI) has been considered as a low energy consumption, economically attractive and environmental friendly method for desalination of salt water. Generally, the electrode materials play the key role in CDI. In the present work, representative activated carbons (ACs) recycled from bitter-tea and palm shell wastes (denoting BAC and PAC, respectively) were used as the CDI electrodes. To provide additional disinfection ability during CDI of salt water, Ag@C core-shell nanoparticles prepared from carbonization of Ag+-cyclodextrin complexes at 673 K were dispersed on the AC electrodes. By FTIR, it seems that the ACs have the less oxygen on their surfaces with more aromatic contents if the compared with the shell wastes as the carbon sources. Electrosorption efficiencies during the one-through CDI of a salt water ([NaCl] = 1000 ppm) using the BAC and PAC electrodes at +1.2 V are 25 and 28%, respectively. As the voltage is increased to +1.6 V, the electrosorption efficiencies and recovery performances of the PAC and Ag@C/PAC electrodes during the repeated CDI tests (+1.6 V → 0 V → +1.6 V) are similar to those operated at 1.2 V. However, after the potential polarity is reversed (+1.6 V to −1.6 V), their electrosorption efficiencies are considerably increased (capable of 40%). The ACs dispersed with the Ag@C nanoparticles (Ag@C/AC) has less contact angles, giving a better hydrophilicity. High disinfection abilities (95–98%) for the Ag@C/ACs electrodes during the 2-h CDI reaction can be obtained. This work exemplifies that the ACs recycled from shell wastes as CDI electrodes for desalination of salt water are chemically feasible. In addition, the AC-based CDI electrodes dispersed with Ag@C core-shell nanoparticles have additional disinfection ability during desalination of salt water.

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