Application of a new immobilized impinging jet stream reactor for photocatalytic degradation of phenol: Reactor evaluation and kinetic modelling

摘要

A new photocatalytic reactor was designed using impinging jet stream on a TiO2coated disc. The characterizations of the TiO2film were carried out by transmission electron microscope, atomic-force microscope, BET and tensile adhesion tests. The influences of the liquid flow rate, coating disc diameter, nozzle-to-disc distance, and initial concentration on phenol removal were investigated. Complete decomposition of a 30?mg?L?1phenol solution was obtained within almost 210?min; additionally, the removal of COD and TOC after 240?min of reaction time were 84% and 79%, respectively. Hydrodynamic model, Langmuir-Hinshelwood kinetics and mass transfer phenomenon were combined to predict the degradation of phenol. The reactor has a higher effectiveness compared to other conventional reactors based on photonic efficiency, electrical energy per order and photocatalytic space-time yield. The performance of the new reactor was also compared with a spinning disc reactor (SDR) in the same operational and structural condition and the results indicated that the new reactor has a higher removal efficiency than the SDR with a rotational speed lower than 150?rpm.