Multilayered TNAs/SnO2/PPy/β-PbO2 anode achieving boosted electrocatalytic oxidation of As(III)

Wenlan Ji, Yuanjie Xiong, Yuan Wang, Tian C. Zhang, Shaojun Yuan

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


Dealing with arsenic pollution has been of great concern owing to inherent toxicity of As(III) to environments and human health. Herein, a novel multilayered SnO2/PPy/β-PbO2 structure on TiO2 nanotube arrays (TNAs/SnO2/PPy/β-PbO2) was synthesized by a multi-step electrodeposition process as an efficient electrocatalyst for As(III) oxidation in aqueous solution. Such TNAs/SnO2/PPy/β-PbO2 electrode exhibited a higher charge transfer, tolerable stability, and high oxygen evolution potential (OEP). The intriguing structure with a SnO2, PPy, and β-PbO2 active layers provided a larger electrochemical active area for electrocatalytic As(III) oxidation. The as-synthesized TNAs/SnO2/PPy/β-PbO2 anode achieved drastically enhanced As(Ⅲ) conversion efficiency of 90.72% compared to that of TNAs/β-PbO2 at circa 45.4%. The active species involved in the electrocatalytic oxidation process included superoxide radical (•O2), sulfuric acid root radicals (•SO4), and hydroxyl radicals (•OH). This work offers a new strategy to construct a high-efficiency electrode to meet the requirements of favorable electrocatalytic oxidation properties, good stability, and high electrocatalytic activity for As(III) transformation to As(V).

Original languageEnglish (US)
Article number128449
JournalJournal of Hazardous Materials
StatePublished - May 15 2022


  • As(III)
  • Electrocatalytic oxidation
  • SnO/PPy conducting layer
  • TiO nanotube arrays
  • β-PbO active layer

ASJC Scopus subject areas

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


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