Influence of CuWO₄-induced heterostructures on porous TiO₂ ceramic coatings for Cr⁶⁺ reduction

Bahramian H., Fattah-alhosseini A., Karbasi M., Kaseem M., Sillanpää M., DİKİCİ B.

Process Safety and Environmental Protection, cilt.202, 2025 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 202
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1016/j.psep.2025.107814
  • Dergi Adı: Process Safety and Environmental Protection
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Biotechnology Research Abstracts, CAB Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Environment Index, Food Science & Technology Abstracts, Greenfile, INSPEC, Metadex, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
  • Anahtar Kelimeler: Cr⁶⁺ photoreduction, Hydrothermal post-treatment, Plasma electrolytic oxidation, TiO2/CuWO4 heterojunction
  • Atatürk Üniversitesi Adresli: Evet

Özet

The discharge of wastewater containing carcinogenic and genotoxic Cr⁶⁺ poses severe risks to environmental and human health. This study presents TiO2/CuWO4 heterostructure photocatalysts synthesized via hydrothermal post-treatment of PEO coatings for Cr⁶⁺ photoreduction. Comprehensive analyses including morphological, structural, compositional, optical, and photoelectrochemical characterization confirmed the formation of a hierarchical coating with uniformly distributed CuWO4 particles on microporous TiO2. The enhanced Cr⁶⁺ photoreduction efficiency stems from CuWO4’s narrower bandgap, its heterojunction formation with TiO2, improved charge carrier separation, reduced charge-transfer resistance, and increased photocurrent, yielding a photocatalytic rate constant 3.77 times higher than that of pure TiO2 coatings. These findings provide crucial insights into Cr⁶⁺ reduction mechanisms and introduce a new approach for photocatalytic coatings in environmental applications.