WAN Yunan， LI Qiaoling， LI Honggang，LIU Xiaoxia， WU Runping， XU Lili

（School of Sciences， North University of China， Taiyuan 030051，China）

Abstract： Activated carbon fiber （ACF）-Ag -TiO₂ nanofiber composite materials were prepared using hydrothermal method combining with solgel method. The samples were analyzed by SEM， TEM and EDS. Taking methylene orange degradation as a model reaction， the photocatalytic property of the material was investigated. The results indicate that the length of nanofibers is between 4 and 8 μm， and the diameter is between 5 and 50 nm. As the mass fraction of element Ag doping in the prepared materials is 0.5%， the photocatalysis efficiency was at the maximum. The photocatalysis efficiency on the methylene orange is up to 95 % after lighting for 30 min.