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Optimization and kinetics for Se4⁺/TiO2 enhanced photocatalytic performance against Polyethylene
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Researchers synthesized selenium-doped TiO₂ nanocatalysts to enhance visible-light photocatalytic degradation of polyethylene plastic, achieving 92.2% degradation efficiency with optimal Se⁴⁺ doping and maintaining 52.8% efficiency after 10 recycling cycles. Response surface methodology confirmed that pH, temperature, and catalyst concentration significantly influence degradation performance, highlighting the potential of Se-TiO₂ for sustainable plastic remediation.
Plastic pollution poses a significant environmental threat, with polyethylene (PE) being one of the most persistent polymers. Conventional recycling methods have limitations, necessitating innovative degradation approaches. In this study, Se⁴⁺-doped TiO₂ (TSe) nanocatalysts were synthesized via the sol-gel method with varying selenium concentrations (0.1–1 w/w%) to enhance photocatalytic performance under visible light. Characterization using XRD, Raman, BET, SEM, FTIR, PL, and UV/Vis spectroscopy confirmed successful doping, structural modifications, and a reduced bandgap (minimum 2.7 eV). Photocatalytic degradation of PE was evaluated, revealing that TSe0.5 exhibited optimal performance with a degradation efficiency of 92.2% and a recyclability of 10 cycles at 52.76% efficiency. Response surface methodology (RSM) was applied to optimize pH, temperature, and catalyst concentration, demonstrating a significant impact on degradation efficiency. The enhanced photocatalytic activity was attributed to Se⁴⁺ incorporation, leading to improved charge carrier separation, increased surface area, and extended visible light absorption. These findings highlight the potential of Se-doped TiO₂ nanocatalysts for efficient and sustainable PE degradation
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This review summarizes recent advances in using TiO2-based photocatalysts to degrade polyethylene microplastics. Researchers examined the mechanisms of photocatalytic degradation and compared degradation efficiencies across studies, noting that wide variation in experimental conditions makes direct comparisons challenging. The study aims to contribute to establishing standardized laboratory protocols for photocatalytic microplastic degradation research.
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Researchers synthesized TiO2-based photocatalysts via sol-gel and hydrothermal methods and characterized their morphology and photocatalytic properties for the degradation of microplastics in aqueous environments, optimizing catalyst formulations to improve efficiency and assessing their potential as an environmentally friendly advanced treatment for waterborne microplastic pollution.
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