Enhanced Degradation of Phenol in an Electrolyte-Containing Model Wastewater Using a Combined Photocatalyst of TiO₂ and Fe(ClO₄)₃ in a Continuous Flow-Type Shallow Photoreactor Combined with Coagulation of TiO₂

抄録

To enhance the degradation of phenol in an electrolyte-containing model wastewater using a combined photocatalyst of TiO₂ and Fe(ClO₄)₃, the optimum operation conditions for a continuous flow-type shallow photoreactor combined with TiO₂ coagulation were examined. The combination of Fe(ClO₄)₃ addition to a TiO₂-suspension in tap water (pH = 3) and a flow rate of 400 mL min^-1 (irradiation time: 50 min) enhanced the degradation of phenol more than that in distilled water while depressing the coagulation of TiO₂ by the electrolytes in tap water. The result was explained by the enhanced formation of ·OH radicals in the Fe(III)/Fe(II) catalytic cycle and the repulsion between the positively charged TiO₂ particles. After the degradation of phenol, neutralization of the suspension enabled sedimentation of the TiO₂ particles.