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Photocatalytic degradation of diclofenac (an emerging contaminant): Effects of photocatalyst amount and air flow rate
Summary
Researchers tested how the amount of titanium dioxide catalyst and airflow rate affect the photocatalytic breakdown of diclofenac, an anti-inflammatory drug found in wastewater. Higher catalyst concentrations and airflow rates accelerated degradation. Pharmaceutical compounds often bind to microplastics, and removing both from water is an important treatment goal.
Photocatalytic degradation of diclofenac, an anti-inflammatory drug, was investigated with TiO2 photocatalyst under UV light (365nm). The effects of photocatalyst concentrations (0.5 g/L, 1 g/L and 2 g/L) and air flow rates (3L/h, 6 L/h, 12 L/h and 18 L/h) on photodegradation kinetic were evaluated for 15 mg/L diclofenac solution during 4 hours. The results showed that the amount of TiO2 and air flow rates have direct influence on the photocatalytic degradation of diclofenac. Excessive catalyst amount and high air flow rates inhibited the degradation of diclofenac. The highest diclofenac degradation efficiency of 78.4 % were achieved by 6 L/h air flow rate with a photocatalyst concentration of 0.5 g/L. The photocatalytic degradation of diclofenac followed the Langmuir-Hinshelwood kinetic model except the experiments carried without air flow and very low air flow rates.
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