中文摘要：

利用红外光谱对铁铈氧化物（Fe-Ce）吸附材料中的金属表面羟基（M—OH）进行了表征，并探讨了金属羟基在砷吸附中的作用．透射和原位温度漫反射-傅立叶变换红外光谱（FTIR）表征结果表明，Fe-Ce表面存在丰富的M—OH，但M—OH含量随制备温度升高而逐渐减少；Fe-Ce上的M—OH与一般金属氧化物的表面羟基特性存在显著不同。可能是一种特殊类型的结构性羟基．对砷吸附前后的Fe-Ce材料进行透射FTIR表征，发现砷饱和吸附后M—OH的摇摆振动消失，同时生成了新的As—O振动峰，表明M—OH在砷的去除中起着重要的作用；初始吸附pH由9．0降至5．0只引起了吸附剂上As—O键的伸缩振动向高频略微偏移；综合FTIR结果可以推测。M—OH和砷阴离子发生了直接的表面络合。在不同的pH条件下均与砷形成了内层络和物．

英文摘要：

Characterization and the role of metal surface hydroxyl groups （M--OH） on an Fe-Ce oxide adsorbent were studied with transmission and in situ diffuse reflectance - infrared Fourier transform spectroscopy （FTIR）. The Fe-Ce oxide contained rich M--OH, which was apparently different from the conventional M--OH groups. The disappearance of the novel M--OH bending vibration band in FTIR spectra with the adsorption of As （V） demonstrated that the M--OH played an important role in the adsorption of As by the Fe-Ce adsorbent. The FTIR analysis results also suggest that direct surface eomplexation between M--OH and As（ V ） occurred in a wide pH range.