Piezoelectric-driven hydrogen peroxide production and in-situ utilization for organic wastewater decontamination and synchronous disinfection: Efficacy, mechanisms and comprehensive assessments
1Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing 400045, China.
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Summary
This study presents an integrated system using bismuth oxyhalide piezocatalysts for efficient hydrogen peroxide (H₂O₂) production and wastewater treatment. The eco-friendly approach enhances pollutant removal and disinfection, offering a sustainable solution for water purification.
Area of Science:
- Environmental Science
- Materials Science
- Chemical Engineering
Background:
- Hydrogen peroxide (H₂O₂) is a green oxidant with potential in wastewater treatment.
- Current research often separates H₂O₂ production from its utilization, limiting integrated system development.
Purpose of the Study:
- To develop a scalable, eco-friendly system for simultaneous H₂O₂ generation and in-situ application.
- To investigate the piezocatalytic performance of bismuth oxyhalides for H₂O₂ production via water oxidation and oxygen reduction reactions.
- To assess the system's efficiency in wastewater disinfection, pollutant removal, and synergistic radical generation.
Main Methods:
- Fabrication of bismuth oxyhalide piezocatalysts.
- Piezocatalytic H₂O₂ production assessment via water oxidation reaction (WOR) and oxygen reduction reaction (ORR).
- Evaluation of wastewater disinfection, sulfamethoxazole removal, and degradation of refractory pollutants using H₂O₂ and periodate (PI).
- Life-cycle and energy consumption analyses.
- Toxicity assessment using computational modeling and biological assays.
Main Results:
- Achieved high piezocatalytic H₂O₂ production (>710 μmol·g⁻¹·h⁻¹) via dual WOR and ORR pathways.
- Demonstrated excellent wastewater disinfection (70.7% antibacterial efficiency) and sulfamethoxazole removal (94.7%).
- Showcased synergistic generation of hydroxyl radicals (•OH) and singlet oxygen (¹O₂) for >90% removal of refractory pollutants under diverse conditions.
- Validated superior sustainability and efficiency compared to traditional methods.
- Confirmed environmental safety through comprehensive toxicity assessments.
Conclusions:
- The integrated bismuth oxyhalide system effectively bridges the gap between H₂O₂ generation and application in water treatment.
- This approach offers a sustainable, efficient, and environmentally safe solution for advanced water purification.
- The study provides significant insights for developing integrated piezocatalytic systems for environmental remediation.