中文摘要：

在负载氧化铁的硅胶颗粒（HMT-silica）表面探讨紫外光照下氧化铁对苯酚降解的影响机理.结果表明,硅胶表面负载的氧化铁可以降低苯酚的降解.光照50 h,吸附在硅胶上的苯酚（固相浓度0.75±0.17μg·mg^-1）降解率为69.3%,而吸附在负载氧化铁硅胶颗粒上的苯酚降解率仅为17.7%.改变苯酚的固相浓度或者硅胶表面氧化铁的负载比例也出现同样的现象,排除了苯酚挥发和不同固体颗粒吸光度差别造成的影响.由自由基信号检测结果表明,产生这种影响的原因主要是在含氧化铁系统中生成的环境持久性自由基阻碍了苯酚的进一步降解.

英文摘要：

In this study, the effects of hematite on phenol degradation on HMT-silica surface were investigated under UV irradiation. The results showed that, under UV irradiation, phenol degradation was reduced because of the coating of hematite on silica surface. After UV irradiation for 50 h, the degradation rate of phenol adsorbed on silica particles（particle concentration 0.75±0.17μg·mg^-1） was 69.3%, while phenol degradation on HMT-silica was 17.7%. In addition, similar phenomena were observed when the phenol concentration or the ratio of hematite on the silica surface was changed. The impact of phenol evaporation and the light absorbance of solid particle were thus excluded. Environmentally persistent free radicals were observed on HMT-silica, which may hinder phenol degradation.