What is the extent of mineralization achieved in the degradation of TPA and BHET using excimer lamps and hydrogen peroxide?

Label:chem

Topic
Chemical oxygen demand (COD) measurements are used to assess the extent of mineralization, which indicates the total oxygen required to oxidize all organic species in the solution. This provides a more comprehensive assessment of treatment efficacy than monomer conversion alone.
Answer
The study found significant mineralization of TPA and BHET using excimer lamps and hydrogen peroxide. For TPA, the KrCl lamp achieved an 80% reduction in COD after 120 minutes of treatment at a 3:1 H₂O₂/TPA mass ratio, indicating substantial mineralization. In contrast, the XeBr lamp achieved only a minor COD reduction. For BHET, the KrCl lamp resulted in a 50% decrease in COD at a 5:1 H₂O₂/BHET mass ratio, while the XeBr lamp showed practically the same COD residual value at a 4:1 ratio. These results highlight the superior mineralization efficiency of the KrCl lamp-based AOP for PET-derived pollutants.
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