Photocatalytic oxidation of 2,4,6-trichlorophenol in water using a cocurrent downflow contactor reactor (CDCR).

摘要: Abstract The heterogeneous photocatalytic oxidation of aqueous solutions 2,4,6-trichlorophenol (2,4,6-TCP) as a model pollutant in industrial wastewater has been carried out pilot scale cocurrent downflow contactor reactor (CDCR). reactions were the presence Ultra-Violet radiation, O 2 and TiO photocatalyst (VP Aeroperl P25/20). was characterized by Dynamic Vapour Sorption (DVS) technique giving specific surface area energy 46.06 m  g −1 80.12 mJ m −2 , respectively. CDC fitted with an internally vertically mounted 1.0 kW or 2.0 kW UV lamp. at 50 °C 1 bar, being operated closed loop recycle mode suspended re-circulated. reactor, device very high mass transfer efficiency unusually large gas hold-up approximately 50%, oxygen dissolution zone above lamp (high zone) along around housing (reaction zone). Under optimized reaction conditions, 100% conversion 2,4,6-TCP achieved 180 min using 15 dm 3 initial concentration 120 mg dm −3 . A combination photocatalyst, irradiation oxidant observed to give most rapid photodegradation photomineralization comparison only. Using 1 kW 2 kW lamps, 100 mg dm after 30 min 62.51% 90.71%, respectively, rates 1.33 × 10 −5 4.22 × 10  mol min rate constants 0.0046 0.29 min