中文摘要：

以湘江牌楼口江段河床表层沉积物为吸附剂,以镉单独污染模拟水样和镉-苯酚复合污染模拟水样为吸附质,比较研究了湘江牌楼口江段河床表层沉积物对两组模拟水样中镉的吸附规律,并进一步研究了苯酚存在对沉积物吸附镉的影响。结果表明：不论苯酚存在与否,湘江牌楼口江段河床表层沉积物对镉的吸附动力学均符合准二级动力学模型,以化学吸附为主;吸附等温线均符合Langmuir等温吸附模型,属单分子层吸附;苯酚的存在增加了沉积物对镉的吸附量,其影响主要是苯酚和沉积物中的氢键与镉发生了配位络合作用;当模拟水样pH值增大时,苯酚对沉积物吸附镉的促进作用减弱,主要原因是中性条件下,镉与沉积物中存在的硫化物、氢氧化物和碳酸盐等发生反应,削弱了苯酚的竞争吸附作用。

英文摘要：

Surface sediments were taken from theXiangjiang riverbed as the adsorbent. Two synthetic water samples,one contaminated by cadmium （ Cd） and the other contaminated by cadmium and phenol, were prepared as the adsorbate. Comparative study had been carried out for removing cadmium from both of the synthetic water samples. In addition, the effect of phenol on the adsorption of cadmium on surface sed-iment had also been studied. The results show that whether phenol exists or not, the pseudosecondorder model describes the adsorption kinet-ics well and the adsorbing ther^nodynamics fits better with Langmuir isother^n model. This indicates that the adsorption of cadmium on surface sediments is mainly chemical and monolayer adsorption in both synthetic water samples. The adsorption capacity increases when phenol exists. The main reason is that the -H bond on phenol and surface sediments have a complex function which increases the adsorption capacity of cad-mium on surface sediments. The influence of phenol to the adsorption of cadmium on surface sediments reduces with the increase of pH, which is due to the reaction between cadmium and sulfide,hydroxide and carbonate in the sediments under the neutral conditions.