A hybrid photocatalytic and enzymatic process using glucose oxidase immobilized on TiO2/polyurethane for removal of a dye

• A coupling of photocatalytic and enzymatic methods has been carried out.
• Highly porous photo-biocatalyst (GOx/TiO2/PU) was prepared.
• Synergetic effects of GOx/TiO2/UV in decolorization of Acid Orange 7 (AO7) were observed.
• Photocatalytic–enzymatic decolorization of 20 mg/L AO7 (>99%) was achieved after 22 min.

A rectangular recycling photo-bioreactor using glucose oxidase (GOx) immobilized on TiO2/polyurethane (PU) was developed as a novel coupling of photodegradation and enzymatic process. This method was tested for removal of Acid Orange 7 (AO7), as a model pollutant. High efficiency of decolorization (>99%) was achieved after 22 min using the GOx/TiO2/PU photo-biocatalyst. Roles of various processes including photodegradation (TiO2/PU), enzymatic process (GOx/PU) and a coupling of photocatalytic–enzymatic (GOx/TiO2/PU) process were investigated in the presence and absence of UV light. All the experiments were performed in a circulation photoreactor equipped with a 6 W UV lamp with rate of 5 mL/min.

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