Microwave-assisted production of CO2-activated biochar from sugarcane bagasse for electrochemical desalination

Yi Hsin Tang, Shou-Heng Liu, Daniel C.W. Tsang

Research output: Contribution to journalArticle

Abstract

A high-performance carbon electrode is desirable for promoting electrochemical desalination efficiency in the membrane capacitive deionization (MCDI). Sugarcane bagasse (food waste) was employed in this study to prepare hierarchically porous biochars by microwave-assisted carbonization and activation with potassium hydroxide in N2 or CO2 atmosphere under varying flow rates (100-600 cm3 min−1). The sugarcane bagasse-derived biochars activated under CO2 flow of 300 cm3 min−1 (denoted as SBB-CO2-300) possessed the ratio of mesopores to total pore volume (Vmeso/Vtotal) of 56.7% with a specific surface area of 1019 m2 g−1. The electrochemical behavior of SBB-CO2-300 was demonstrated by a surpassing specific capacitance of 208 F g−1 at 5 mV s−1 by means of cyclic voltammetry. The desalination tests using a batch-mode MCDI at 1.2 V in a 5 mM NaCl solution indicated that the SBB-CO2-300 electrode exhibited an excellent electrosorption capacity of 28.9 mg g-1. The improvement in the electrochemical deionization performance of SBB-CO2-300 was attributed to the superior Vmeso/Vtotal ratio, high surface area, excellent capacitance behavior, and hierarchical pore structure. The biowaste-derived biochars prepared via facile microwave-assisted carbonization and CO2 activation route can provide a sustainable and high-efficiency carbon electrode for electrochemical deionization of brackish water.

Original languageEnglish
Article number121192
JournalJournal of Hazardous Materials
Volume383
DOIs
Publication statusPublished - 2020 Feb 5

Fingerprint

Saccharum
Bagasse
Desalination
Microwaves
desalination
Electrodes
electrode
Carbonization
Capacitance
Carbon
surface area
Chemical activation
membrane
Membranes
Potassium hydroxide
carbon
Pore structure
Atmosphere
brackish water
Specific surface area

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

@article{e701303278c34e40bcf5c1c7a84561e2,
title = "Microwave-assisted production of CO2-activated biochar from sugarcane bagasse for electrochemical desalination",
abstract = "A high-performance carbon electrode is desirable for promoting electrochemical desalination efficiency in the membrane capacitive deionization (MCDI). Sugarcane bagasse (food waste) was employed in this study to prepare hierarchically porous biochars by microwave-assisted carbonization and activation with potassium hydroxide in N2 or CO2 atmosphere under varying flow rates (100-600 cm3 min−1). The sugarcane bagasse-derived biochars activated under CO2 flow of 300 cm3 min−1 (denoted as SBB-CO2-300) possessed the ratio of mesopores to total pore volume (Vmeso/Vtotal) of 56.7{\%} with a specific surface area of 1019 m2 g−1. The electrochemical behavior of SBB-CO2-300 was demonstrated by a surpassing specific capacitance of 208 F g−1 at 5 mV s−1 by means of cyclic voltammetry. The desalination tests using a batch-mode MCDI at 1.2 V in a 5 mM NaCl solution indicated that the SBB-CO2-300 electrode exhibited an excellent electrosorption capacity of 28.9 mg g-1. The improvement in the electrochemical deionization performance of SBB-CO2-300 was attributed to the superior Vmeso/Vtotal ratio, high surface area, excellent capacitance behavior, and hierarchical pore structure. The biowaste-derived biochars prepared via facile microwave-assisted carbonization and CO2 activation route can provide a sustainable and high-efficiency carbon electrode for electrochemical deionization of brackish water.",
author = "Tang, {Yi Hsin} and Shou-Heng Liu and Tsang, {Daniel C.W.}",
year = "2020",
month = "2",
day = "5",
doi = "10.1016/j.jhazmat.2019.121192",
language = "English",
volume = "383",
journal = "Journal of Hazardous Materials",
issn = "0304-3894",
publisher = "Elsevier",

}

Microwave-assisted production of CO2-activated biochar from sugarcane bagasse for electrochemical desalination. / Tang, Yi Hsin; Liu, Shou-Heng; Tsang, Daniel C.W.

In: Journal of Hazardous Materials, Vol. 383, 121192, 05.02.2020.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Microwave-assisted production of CO2-activated biochar from sugarcane bagasse for electrochemical desalination

AU - Tang, Yi Hsin

AU - Liu, Shou-Heng

AU - Tsang, Daniel C.W.

PY - 2020/2/5

Y1 - 2020/2/5

N2 - A high-performance carbon electrode is desirable for promoting electrochemical desalination efficiency in the membrane capacitive deionization (MCDI). Sugarcane bagasse (food waste) was employed in this study to prepare hierarchically porous biochars by microwave-assisted carbonization and activation with potassium hydroxide in N2 or CO2 atmosphere under varying flow rates (100-600 cm3 min−1). The sugarcane bagasse-derived biochars activated under CO2 flow of 300 cm3 min−1 (denoted as SBB-CO2-300) possessed the ratio of mesopores to total pore volume (Vmeso/Vtotal) of 56.7% with a specific surface area of 1019 m2 g−1. The electrochemical behavior of SBB-CO2-300 was demonstrated by a surpassing specific capacitance of 208 F g−1 at 5 mV s−1 by means of cyclic voltammetry. The desalination tests using a batch-mode MCDI at 1.2 V in a 5 mM NaCl solution indicated that the SBB-CO2-300 electrode exhibited an excellent electrosorption capacity of 28.9 mg g-1. The improvement in the electrochemical deionization performance of SBB-CO2-300 was attributed to the superior Vmeso/Vtotal ratio, high surface area, excellent capacitance behavior, and hierarchical pore structure. The biowaste-derived biochars prepared via facile microwave-assisted carbonization and CO2 activation route can provide a sustainable and high-efficiency carbon electrode for electrochemical deionization of brackish water.

AB - A high-performance carbon electrode is desirable for promoting electrochemical desalination efficiency in the membrane capacitive deionization (MCDI). Sugarcane bagasse (food waste) was employed in this study to prepare hierarchically porous biochars by microwave-assisted carbonization and activation with potassium hydroxide in N2 or CO2 atmosphere under varying flow rates (100-600 cm3 min−1). The sugarcane bagasse-derived biochars activated under CO2 flow of 300 cm3 min−1 (denoted as SBB-CO2-300) possessed the ratio of mesopores to total pore volume (Vmeso/Vtotal) of 56.7% with a specific surface area of 1019 m2 g−1. The electrochemical behavior of SBB-CO2-300 was demonstrated by a surpassing specific capacitance of 208 F g−1 at 5 mV s−1 by means of cyclic voltammetry. The desalination tests using a batch-mode MCDI at 1.2 V in a 5 mM NaCl solution indicated that the SBB-CO2-300 electrode exhibited an excellent electrosorption capacity of 28.9 mg g-1. The improvement in the electrochemical deionization performance of SBB-CO2-300 was attributed to the superior Vmeso/Vtotal ratio, high surface area, excellent capacitance behavior, and hierarchical pore structure. The biowaste-derived biochars prepared via facile microwave-assisted carbonization and CO2 activation route can provide a sustainable and high-efficiency carbon electrode for electrochemical deionization of brackish water.

UR - http://www.scopus.com/inward/record.url?scp=85072164124&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85072164124&partnerID=8YFLogxK

U2 - 10.1016/j.jhazmat.2019.121192

DO - 10.1016/j.jhazmat.2019.121192

M3 - Article

AN - SCOPUS:85072164124

VL - 383

JO - Journal of Hazardous Materials

JF - Journal of Hazardous Materials

SN - 0304-3894

M1 - 121192

ER -