Ag掺杂TiO2光催化剂的制备及其处理造纸废水研究

Preparation of Ag Doped TiO2 Photocatalyst and Its Advanced Treatment for Paper Process Effluent

关键词:  Ag掺杂TiO₂  光催化剂  COD_Cr去除率  造纸废水

Key Words:Ag doping TiO₂  photocatalyst  COD_Cr removal rate  paper wastewater

摘要:采用溶胶-凝胶法制备Ag掺杂TiO₂（Ag-TiO₂）光催化剂，采用X射线衍射仪（XRD）、紫外-可见分光光度计（UV-vis）、扫描电子显微镜（SEM）、能谱仪（EDS）对所制备Ag-TiO₂光催化剂进行表征，并用该光催化剂处理中段造纸废水，以降低造纸废水的COD_Cr和色度。探讨了Ag掺杂量、造纸废水初始pH值、光催化剂用量和光照时间对处理效果的影响。结果表明，Ag掺杂后TiO₂的结晶度下降，Ag-TiO₂的禁带宽度随Ag掺杂量的增大而减小。废水处理结果表明，当造纸废水初始pH值为6、光催化剂用量为0.6 g/L、Ag掺杂量为3%时，Ag-TiO₂光催化效果最佳，光照12 h后，造纸废水的色度和COD_Cr去除率分别达到100%和81.3%。

Abstract:Ag doped TiO₂ photocatalyst was prepared by sol-gel method. The prepared samples were characterized by XRD, UV-vis, SEM and EDS. The crystallinity and band gap of synthesized TiO₂ decreased when the doping amount of Ag was increased. The photocatalyst was applied to treat washing and bleaching effluent in order to induce COD_Cr and chroma. This paper analyzed the effect degree on the consequence of different factors such as doping content of Ag, original pH value of washing and bleaching effluent, amount of photocatalyst and illumination time .The photocatalytic treatment test indicated that the photocatalytic degradation was optimum when the Ag doping amount was 3%, the pH value was 6 and the catalyst dosage was 0.6 g/L. The chroma and COD_Cr removal rate were 100% and 81.3% respectively after 12 hours radiation.