湘江衡阳段底泥吸附Pb^(2+)和Cd^(2+)的研究  

Adsorption of Pb^(2+) and Cd^(2+) on Sediment in Hengyang Section of Xiang River

作　　者：林振波[1] 何少华[1] 夏勇锋[1] 凌静[1] 王丹[1] 

机构地区：[1]南华大学城市建设学院,湖南衡阳421001

出　　处：《环境科学与技术》2014年第5期42-46,共5页Environmental Science & Technology

摘　　要：以衡阳段湘江上游为研究对象,探讨了其吸附Pb2+、Cd2+的影响因素及其热力学规律,以求为湘江流域重金属污染防治提供依据。结果表明,底泥吸附Pb2+的效果优于Cd2+;pH为2~6时,吸附量随pH值的增大而增大,pH<4时影响很大;泥水比增大,水中重金属剩余浓度减小,但吸附量减小;Pb2+、Cd2+浓度增加,吸附量增大。温度升高,底泥对Pb2+、Cd2+的吸附量略微增大。底泥吸附Pb2+等温式更符合Langmuir方程,Cd2+的更符合Freundlich方程。该吸附是自发、吸热的。To provide a basis for prevention and control of heavy metal pollution in Xiang River Basin, the influencing factors and thermodynamic law of the adsorption of Pb^2＋ and Cd^2＋ on sediment in Hengyang section of Xiang River were studied. Results showed that adsorption effect of Pb^2＋ was better than that of Cd^2＋. When pH value ranged from 2 to 6, the adsorption quantity increased with the increase of pH value, and it decreased sharply when pH value was less than 4. Increasing mud to water ratio would lead to decreasing of both adsorption quantity and heavy metal remaining concentration in water. Adsorption quantity also increased as concentration of Pb^2＋ and Cd^2＋ increased. The amount of sediment on the adsorption of Pb^2＋ and Cd^2＋ increased slightly with the increases of temperature. The adsorption isotherms of Pb^2＋ followed the Langmuir equation better, while Cd^2＋ fitted the Freundlich equation better. The adsorption process was spontaneous and endothermic.

关 键 词：底泥 吸附 PB^2+ CD^2+ 

分 类 号：X522[环境科学与工程—环境工程]