TY - JOUR
T1 - Simultaneous capacitive deionisation and disinfection of saltwater by Ag@C/rGO electrodes
AU - Chang, W. T.
AU - Chen, P. A.
AU - Chen, W. R.
AU - Liu, S. H.
AU - Wang, H. Paul
N1 - Funding Information:
Declaration of funding. The financial supports of the Taiwan Ministry of Science and Technology (110-2221-E-006-107-MY2), EPA (10GA0008001047) and National Synchrotron Radiation Research Center are gratefully acknowledged.
Publisher Copyright:
© 2021
PY - 2022/4
Y1 - 2022/4
N2 - Capacitive deionisation (CDI) of saltwater, with the advantages of low energy consumption and being environmentally friendly, has been considered a potential solution to the scarcity of fresh water from sea, contaminated or waste waters. In the present work, Ag@C core-shell nanoparticle dispersed rGO (Ag@C/rGO) electrodes were synthesised and used for the CDI of saltwater. To better understand the formation mechanism of the Ag@C core-shell nanoparticles, temperature-programmed carbonisation of the Ag+-β-cyclodextrin complexes was studied by in situ synchrotron small-Angle X-ray scattering spectroscopy. At 573 K, the core Ag metal forms Ag@C core-shell nanoparticles with the highest probability nanosizes of 40-80 nm. In the 4-cycle flow-by CDI (once through) experiments using the Ag@C/GO electrodes, high electrosorption efficiencies (25.0-44.9%) were obtained. Each CDI cycle involving electrosorption at 1.2 V and regeneration at 0 V for 1 h was highly reversible. In addition, the disinfection efficiency of the Ag@C/rGO electrodes, contributed by both silver and rGO, was very high (>97%). This study shows that the easily synthesised Ag@C/rGO core-shell carbon-based electrodes are feasible for simultaneous deionisation and disinfection of saltwater as a potential source of drinking water.
AB - Capacitive deionisation (CDI) of saltwater, with the advantages of low energy consumption and being environmentally friendly, has been considered a potential solution to the scarcity of fresh water from sea, contaminated or waste waters. In the present work, Ag@C core-shell nanoparticle dispersed rGO (Ag@C/rGO) electrodes were synthesised and used for the CDI of saltwater. To better understand the formation mechanism of the Ag@C core-shell nanoparticles, temperature-programmed carbonisation of the Ag+-β-cyclodextrin complexes was studied by in situ synchrotron small-Angle X-ray scattering spectroscopy. At 573 K, the core Ag metal forms Ag@C core-shell nanoparticles with the highest probability nanosizes of 40-80 nm. In the 4-cycle flow-by CDI (once through) experiments using the Ag@C/GO electrodes, high electrosorption efficiencies (25.0-44.9%) were obtained. Each CDI cycle involving electrosorption at 1.2 V and regeneration at 0 V for 1 h was highly reversible. In addition, the disinfection efficiency of the Ag@C/rGO electrodes, contributed by both silver and rGO, was very high (>97%). This study shows that the easily synthesised Ag@C/rGO core-shell carbon-based electrodes are feasible for simultaneous deionisation and disinfection of saltwater as a potential source of drinking water.
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U2 - 10.1071/EN21131
DO - 10.1071/EN21131
M3 - Article
AN - SCOPUS:85126360138
VL - 18
SP - 352
EP - 359
JO - Environmental Chemistry
JF - Environmental Chemistry
SN - 1448-2517
IS - 8
ER -