AI Article Synopsis

  • The photoelectrocatalytic advanced oxidation process (PEAOP) relies on advanced photoanodes to effectively break down complex pollutants in industrial wastewater.
  • A new 2D WO/MXene heteronanostructure was created to enhance oxidation efficiency, successfully oxidizing phenol and arsenic (III) to non-toxic forms using visible light.
  • The WO/MXene photoanode demonstrated high performance and recyclability, highlighting its potential for economical and energy-efficient water purification solutions.

Article Abstract

The photoelectrocatalytic advanced oxidation process (PEAOP) necessitates high-performing and stable photoanodes for the effective oxidation of complex pollutants in industrial wastewater. This study presents the construction of 2D WO/MXene heteronanostructures for the development of efficient and stable photoanode. The WO/MXene heterostructure features well-ordered WO photoactive sites anchored on micron-sized MXene sheets, providing an increased visible light active catalytic surface area and enhanced electrocatalytic activities for pollutant oxidation. Phenol, a highly toxic compound, was completely oxidized at an applied potential of 0.8 V vs. RHE under visible light irradiation. Systematic optimization of operational conditions for the photoelectrocatalytic oxidation of phenol was conducted. The phenol oxidation mechanism was elucidated via high-performance liquid chromatography (HPLC) analysis and the identification of intermediate compounds. Additionally, a mixed model of phenol and arsenic (III) in polluted water demonstrated the capability of WO/MXene photoanode for the simultaneous oxidation of both organic and inorganic pollutants, achieving complete conversion of phenol and As(III) to non-toxic As(V). The WO/MXene photoanode facilitated water oxidation, generating a substantial amount of O and OH oxidative species, which are crucial for the concurrent oxidation of phenol and arsenic. Recyclability tests demonstrated a 99% retention of performance, confirming the WO/MXene photoanode's suitability for long-term operation in PEAOPs. The findings suggest that integrating WO/MXene photoanodes into water purification systems can enhance economic feasibility, reduce energy consumption, and improve efficiency. This PEAOP offers a viable solution to the critical issue of heavy metal and organic chemical pollution in various water bodies, given its scalability and ability to preserve ecosystems while conserving clean water resources.

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http://dx.doi.org/10.1016/j.envres.2024.119676DOI Listing

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