Photocatalytically reductive defluorination of perfluorooctanoic acid (PFOA) using Pt/La2Ti2O7 nanoplates: Experimental and DFT assessment

Chen Chen, Qingquan Ma, Fangzhou Liu, Jianan Gao, Xinyang Li, Shaobin Sun, Hong Yao, Changqing Liu, Joshua Young, Wen Zhang

Research output: Contribution to journalArticlepeer-review

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Abstract

To enable efficient degradation of perfluorooctanoic acid (PFOA), we prepared and investigated a nanosheet photocatalyst (Pt/La2Ti2O7). Doping platinum nanoparticles on La2Ti2O7 varied the band structure and improved the photocatalytic activity due to the enhanced charge separation. Methanol as the electron donor and sacrificial reagent significantly promoted the photocatalytically reductive degradation of PFOA that reduced by 40% within 180 min under UV254 irradiation (1 mW∙cm[sbnd]2). The density functional theory calculations were used to analyze the effects of Pt doping and band structures on interfacial electron transfer and degradation pathways. As opposed to photocatalytic oxidation, this UV/Pt/La2Ti2O7/CH3OH photocatalysis could abstract electrons from methanol and convert to free reactive radicals and photo-generated electrons to reductively defluorinate PFOA and potentially other polyhalogenated or perhalogenated organic compounds.

Original languageEnglish (US)
Article number126452
JournalJournal of Hazardous Materials
Volume419
DOIs
StatePublished - Oct 5 2021

All Science Journal Classification (ASJC) codes

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

Keywords

  • Perfluorooctanoic acid
  • Photocatalysis, DFT
  • Pt/LaTiO
  • Reductive defluorination

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