Preparation of Activated Carbon Supported Nano-TiO2 Photocatalyst Material and its Application in Papermaking Midcourse Wastewater

Activated carbon supported nano-TiO₂ photocatalyst material was prepared with activated carbon as the carrier and carboxyl methyl cellulose (CMC) as the binder. The results indicated that the optimal TiO2 loading percentage could reach 11.46% when the mass concentration of binder in the dipping solution was 15 g/L. Meanwhile, the optimal experimental results showed that the removal percentage of COD_Cr from papermaking midcourse wastewater could reach 71.43% under the conditions of 10 W of radiation intensity, 240 minutes of radiation time, 15 g/L of photocatalyst dosage, 4.0 of wastewater pH and 3 mL/L of H₂O₂ dosage. And the effluent was able to reach China national discharge standard Ⅰ. Furthermore, after three times of repeated use, the activated carbon supported nano-TiO₂ photocatalyst material still had a relatively high catalytic activity and stability, and the recycle percentage of the photocatalyst could reach 92.80%.