Capacitive Removal of Fluoride Ions via Creating Multiple Capture Sites in a Modulatory Heterostructure

Guizhi Wang, Tingting Yan, Junjie Shen, Jianping Zhang, Dengsong Zhang

Research output: Contribution to journalArticlepeer-review

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 Al2O3coating 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.

Original languageEnglish
Pages (from-to)11979-11986
Number of pages8
JournalEnvironmental Science and Technology
Volume55
Issue number17
Early online date24 Aug 2021
DOIs
Publication statusPublished - 7 Sep 2021

Keywords

  • capacitive removal
  • fluoride ions
  • modulatory heterostructure
  • multiple capture sites
  • wastewater

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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