Capacitive Removal of Fluoride Ions via Creating Multiple Capture Sites in a Modulatory Heterostructure.
Environ Sci Technol
; 55(17): 11979-11986, 2021 09 07.
Article
em En
| MEDLINE
| ID: mdl-34427438
ABSTRACT
Fluoride pollution has become a major concern because of its adverse effects on human health. However, the removal capacity of defluorination agents in traditional methods is far from satisfactory. Herein, capacitive removal of F- ions via creating multiple capture sites in a modulatory heterostructure has been originally demonstrated. The heterostructure of uniformly dispersed Al2O3 coating on hollow porous nitrogen-doped carbon frameworks was precisely synthesized by atomic layer deposition. An exceptional F- ion removal efficiency at 1.2 V (95.8 and 92.9% in 5 and 10 mg/L F- solutions, respectively) could be finally achieved, with a good regeneration ability after 20 consecutive defluorination cycles. Furthermore, we investigated the removal mechanisms of F- ions by in situ Raman, in situ X-ray diffraction, and ex situ X-ray photoelectron spectroscopy measurements. The promotional removal capacity was realized by the multiple capture sites of the reversible conversion of Al-F species and the insertion of F- ions into the carbon skeleton. This work offers an important new pathway and deep understanding for efficient removal of F- ions from wastewater.
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Base de dados:
MEDLINE
Assunto principal:
Purificação da Água
/
Fluoretos
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article