活性炭负载TiO2的制备及催化臭氧处理造纸废水的应用

Preparation of Activated Carbon Supported TiO2 and Its Application in Catalytic Ozonation Treatment of Papermaking Wastewater

关键词:  活性炭负载TiO₂  催化氧化  去除率

Key Words:activated carbon supported TiO₂  catalytic ozonation  removal rate

摘要:以钛酸丁酯为钛源，用溶胶-凝胶法在活性炭（AC）表面负载TiO₂，经焙烧后制得TiO₂/AC催化剂，采用X射线衍射（XRD）和扫描电镜（SEM）对TiO₂/AC催化剂表面形貌和晶型进行表征，并研究了该催化剂催化臭氧处理造纸废水时对废水COD_Cr和色度的去除效果。结果表明，TiO₂均匀地涂覆于活性炭的表面，经500℃焙烧后的TiO₂为钛锐矿晶型，TiO₂负载量为3.38%的TiO₂/AC催化臭氧处理造纸废水效果最好，当反应12 min时，废水的色度和COD_Cr去除率达到96.9%和54.4%，分别比单独臭氧化过程提高了12.3和21.7个百分点，比活性炭臭氧化过程提高了5.3和14.2个百分点，TiO₂/AC催化臭氧处理造纸废水极大地提高了对废水COD_Cr的去除率。

Abstract:Activated carbon (AC) supported TiO₂ catalysts (TiO₂/AC) were prepared by sol-gel method from Ti(OBu)₄. The crystalline and morphology of TiO₂/AC were characterized by XRD and SEM respectively. The removal rates of COD_Cr and color of the wastewater during catalytic ozonation with the presence of TiO2/AC were studied. The results indicated that anatase phase was detected after the TiO₂/AC was heated at 500℃ for 3 h, and TiO₂ particles distributed uniformly on the surface of activated carbon. The best degradation rate during the treatment of papermaking wastewater by TiO₂/AC catalytic ozonation process was 3.38% titania loading, color and COD_Cr removal rates were up to 96.9% and 54.4% respectively when reaction time was 12 min. Which were increased by 12.3 units and 21.7 units compared with that of single ozonation process, and increased by 5.3 units and 14.2 units compared with the activated carbon catalytic ozonation. The COD_Cr removal rate of papermaking wastewater was greatly increased by TiO₂/AC catalytic ozonation.