Removal of Trace Arsenite through Simultaneous Photocatalytic Oxidation and Adsorption by Magnetic Fe3O4@PpPDA@TiO2Core-Shell Nanoparticles

Yuan Wang, Yan Zhang, Tian C. Zhang, Gang Xiang, Xinlong Wang, Shaojun Yuan

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Efficient removal of trace arsenites [As(III)] in groundwater is a big challenge worldwide. In this study, magnetic Fe3O4@poly(p-phenylenediamine)@TiO2 (Fe3O4@PpPDA@TiO2) core-shell nanoparticles were synthesized for As(III) ions removal via the photocatalytic oxidation-adsorption process. Under dark conditions, the As(III) adsorption on the as-synthesized core-shell nanoparticles obeyed the pseudo-second-order kinetic model and reached adsorption equilibrium within 45 min with a removal efficiency of 36.5%. Under visible-light irradiation, approximately 92% of As(III) ions were transformed into relatively low-toxic As(V) ions via the Fe3O4@PpPDA@TiO2 core-shell nanoparticles, and the arsenic removal efficiency increased dramatically to about 81% owing to As(V) ions being simultaneously adsorbed on the nanocomposite surfaces. The photocatalytic oxidation mechanisms were attributed to the synergism of photogenerated holes, hydroxyl radicals, and superoxide radicals. The as-synthesized Fe3O4@PpPDA@TiO2 core-shell nanoparticles are potentially useful in purifying the trace As(III)-contaminated groundwater owing to their easy magnetic separation, high optical quantum efficiency, and visible-light photocatalytic activity.

Original languageEnglish (US)
Pages (from-to)8495-8504
Number of pages10
JournalACS Applied Nano Materials
Volume3
Issue number8
DOIs
StatePublished - Aug 28 2020

Keywords

  • As(III) ions
  • TiO
  • adsorption
  • magnetic core-shell nanoparticles
  • photocatalytic oxidation

ASJC Scopus subject areas

  • Materials Science(all)

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