苯酚对湘江牌楼口江段沉积物吸附镉影响研究
发布时间：2019-02-16 19:02
【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。
[Abstract]:In this paper, the surface sediment of the river bed in the estuary of the Xiangjiang River was used as adsorbent, the simulated water samples polluted by cadmium alone and the water samples polluted by cadmium and phenol were used as adsorbents. The adsorption law of cadmium in two groups of simulated water samples by the surface sediment of the river bed in the river reach of Baikou section of Xiangjiang River was studied, and the effect of phenol on the adsorption of cadmium in sediment was further studied. The results show that the adsorption kinetics of cadmium on the surface sediment of the river bed in the estuary section of the Xiangjiang River is in accordance with the quasi-second-order kinetic model, and chemisorption is the main one, regardless of whether phenol exists or not. The adsorption isotherms all accord with Langmuir isothermal adsorption model and belong to monolayer adsorption. The presence of phenol increases the amount of cadmium adsorbed by sediment and the effect is mainly due to the complexation of hydrogen bond in phenol and sediment with cadmium. When the pH value of simulated water samples increased, the effect of phenol on cadmium adsorption was weakened, mainly due to the reaction between cadmium and sulfides, hydroxides and carbonates in sediments under neutral conditions. The competitive adsorption of phenol was weakened.
【作者单位】： 湖南大学土木工程学院;
【基金】：湖南省建设厅科技项目(湘财建指[2015]105号)
【分类号】：O647.3;X52
本文编号：2424743
[Abstract]:In this paper, the surface sediment of the river bed in the estuary of the Xiangjiang River was used as adsorbent, the simulated water samples polluted by cadmium alone and the water samples polluted by cadmium and phenol were used as adsorbents. The adsorption law of cadmium in two groups of simulated water samples by the surface sediment of the river bed in the river reach of Baikou section of Xiangjiang River was studied, and the effect of phenol on the adsorption of cadmium in sediment was further studied. The results show that the adsorption kinetics of cadmium on the surface sediment of the river bed in the estuary section of the Xiangjiang River is in accordance with the quasi-second-order kinetic model, and chemisorption is the main one, regardless of whether phenol exists or not. The adsorption isotherms all accord with Langmuir isothermal adsorption model and belong to monolayer adsorption. The presence of phenol increases the amount of cadmium adsorbed by sediment and the effect is mainly due to the complexation of hydrogen bond in phenol and sediment with cadmium. When the pH value of simulated water samples increased, the effect of phenol on cadmium adsorption was weakened, mainly due to the reaction between cadmium and sulfides, hydroxides and carbonates in sediments under neutral conditions. The competitive adsorption of phenol was weakened.
【作者单位】： 湖南大学土木工程学院;
【基金】：湖南省建设厅科技项目(湘财建指[2015]105号)
【分类号】：O647.3;X52
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1 李晨芮;负载型磷化镍催化剂对苯酚的加氢性能研究[D];郑州大学;2017年
，本文编号：2424743
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