Selective adsorption of phosphate by carboxyl-modified activated carbon electrodes for capacitive deionization

Capacitive deionization (CDI) has been considered as a promising technology for removing phosphate from water but suffer inferior selectivity and electrosorption performances for phosphate of current carbon electrodes in CDI. Herein, we achieved highly selective phosphate removal from a ternary effl...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Luwei Miao, Wenyang Deng, Xiaohong Chen, Ming Gao, Wenqing Chen, Tianqi Ao
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	activated carbon electrode capacitive deionization carboxyl groups desalination selective adsorption Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/a46edd6942b6477aa8b2cddd3cfd8aeb
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:a46edd6942b6477aa8b2cddd3cfd8aeb
record_format	dspace
spelling	oai:doaj.org-article:a46edd6942b6477aa8b2cddd3cfd8aeb2021-11-06T11:24:29ZSelective adsorption of phosphate by carboxyl-modified activated carbon electrodes for capacitive deionization0273-12231996-973210.2166/wst.2021.358https://doaj.org/article/a46edd6942b6477aa8b2cddd3cfd8aeb2021-10-01T00:00:00Zhttp://wst.iwaponline.com/content/84/7/1757https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Capacitive deionization (CDI) has been considered as a promising technology for removing phosphate from water but suffer inferior selectivity and electrosorption performances for phosphate of current carbon electrodes in CDI. Herein, we achieved highly selective phosphate removal from a ternary effluent of Cl−, , and by using nitric acid-treated activated carbon (AC) with various modification times and pure AC as the anode and cathode, a novel phosphate selective asymmetric CDI reactor. The results showed that carboxyl groups greatly grafted on the materials after modification (varying from 0.00084 to 0.0012 mol g−1). The phosphate selectivity of the present research was higher than that of unmodified CDI, and it increased with the increase of carboxyl groups content. The highest phosphate selectivity (2.01) in modified materials is almost six times higher than that of pure AC. Moreover, the modified electrodes exhibited good regenerative ability with a phosphate desorption efficiency of around 72.12% during the adsorption/desorption process and great stability during the cycling experiment. These results demonstrated that the innovative application of nitric acid-modified AC can effectively selectively remove phosphate from mixed anion solution, opening a hopeful window to selective adsorption in water treatment by CDI. HIGHLIGHTS Using nitric acid-modified AC for phosphate adsorption when applying to CDI anode.; Nitric acid treatment could improve the adsorption capacity of phosphate.; The effect of hydrogen-bond interaction on selectively adsorption was discussed.; AC-3 exhibits great cyclability and excellent stability.;Luwei MiaoWenyang DengXiaohong ChenMing GaoWenqing ChenTianqi AoIWA Publishingarticleactivated carbon electrodecapacitive deionizationcarboxyl groupsdesalinationselective adsorptionEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 7, Pp 1757-1773 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	activated carbon electrode capacitive deionization carboxyl groups desalination selective adsorption Environmental technology. Sanitary engineering TD1-1066
spellingShingle	activated carbon electrode capacitive deionization carboxyl groups desalination selective adsorption Environmental technology. Sanitary engineering TD1-1066 Luwei Miao Wenyang Deng Xiaohong Chen Ming Gao Wenqing Chen Tianqi Ao Selective adsorption of phosphate by carboxyl-modified activated carbon electrodes for capacitive deionization
description	Capacitive deionization (CDI) has been considered as a promising technology for removing phosphate from water but suffer inferior selectivity and electrosorption performances for phosphate of current carbon electrodes in CDI. Herein, we achieved highly selective phosphate removal from a ternary effluent of Cl−, , and by using nitric acid-treated activated carbon (AC) with various modification times and pure AC as the anode and cathode, a novel phosphate selective asymmetric CDI reactor. The results showed that carboxyl groups greatly grafted on the materials after modification (varying from 0.00084 to 0.0012 mol g−1). The phosphate selectivity of the present research was higher than that of unmodified CDI, and it increased with the increase of carboxyl groups content. The highest phosphate selectivity (2.01) in modified materials is almost six times higher than that of pure AC. Moreover, the modified electrodes exhibited good regenerative ability with a phosphate desorption efficiency of around 72.12% during the adsorption/desorption process and great stability during the cycling experiment. These results demonstrated that the innovative application of nitric acid-modified AC can effectively selectively remove phosphate from mixed anion solution, opening a hopeful window to selective adsorption in water treatment by CDI. HIGHLIGHTS Using nitric acid-modified AC for phosphate adsorption when applying to CDI anode.; Nitric acid treatment could improve the adsorption capacity of phosphate.; The effect of hydrogen-bond interaction on selectively adsorption was discussed.; AC-3 exhibits great cyclability and excellent stability.;
format	article
author	Luwei Miao Wenyang Deng Xiaohong Chen Ming Gao Wenqing Chen Tianqi Ao
author_facet	Luwei Miao Wenyang Deng Xiaohong Chen Ming Gao Wenqing Chen Tianqi Ao
author_sort	Luwei Miao
title	Selective adsorption of phosphate by carboxyl-modified activated carbon electrodes for capacitive deionization
title_short	Selective adsorption of phosphate by carboxyl-modified activated carbon electrodes for capacitive deionization
title_full	Selective adsorption of phosphate by carboxyl-modified activated carbon electrodes for capacitive deionization
title_fullStr	Selective adsorption of phosphate by carboxyl-modified activated carbon electrodes for capacitive deionization
title_full_unstemmed	Selective adsorption of phosphate by carboxyl-modified activated carbon electrodes for capacitive deionization
title_sort	selective adsorption of phosphate by carboxyl-modified activated carbon electrodes for capacitive deionization
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/a46edd6942b6477aa8b2cddd3cfd8aeb
work_keys_str_mv	AT luweimiao selectiveadsorptionofphosphatebycarboxylmodifiedactivatedcarbonelectrodesforcapacitivedeionization AT wenyangdeng selectiveadsorptionofphosphatebycarboxylmodifiedactivatedcarbonelectrodesforcapacitivedeionization AT xiaohongchen selectiveadsorptionofphosphatebycarboxylmodifiedactivatedcarbonelectrodesforcapacitivedeionization AT minggao selectiveadsorptionofphosphatebycarboxylmodifiedactivatedcarbonelectrodesforcapacitivedeionization AT wenqingchen selectiveadsorptionofphosphatebycarboxylmodifiedactivatedcarbonelectrodesforcapacitivedeionization AT tianqiao selectiveadsorptionofphosphatebycarboxylmodifiedactivatedcarbonelectrodesforcapacitivedeionization
_version_	1718443687385497600

Selective adsorption of phosphate by carboxyl-modified activated carbon electrodes for capacitive deionization

Ejemplares similares