2,4-二氯苯酚在太湖沉积物中的吸附/解吸行为研究  

Study on the Sorption/Desorption Behaviors of 2,4-Dichlorophenol in Tai Lake Sediments

作　　者：徐红霞[1] 吴海燕[1] 张景飞[1] 吴吉春[1] 

机构地区：[1]南京大学水科学系,南京210093

出　　处：《农业环境科学学报》2008年第4期1415-1420,共6页Journal of Agro-Environment Science

基　　金：国家自然科学基金青年基金资助(40502024)

摘　　要：采用吸附、解吸动力学实验方法,研究了太湖沉积物对2,4-二氯苯酚(2,4-Dichlorophenol)的吸附、解吸规律,同时探讨了环境因子如温度、pH值以及离子强度等对其吸附行为的影响。结果表明,2,4-DCP在太湖沉积物中的吸附/解吸在4h内快速达到平衡;线性等温式和Freundlich等温式都可以较好地描述太湖沉积物对2,4-DCP的吸附行为,即存在分配作用和表面吸附作用两种吸附机制;温度和离子强度的增加有利于沉积物对2,4-DCP的吸附,pH值对2,4-DCP吸附等温线的影响则不明显;2,4-DCP在贡湖沉积物中的吸附/解吸存在着明显的不可逆吸附,即吸附/解吸迟滞行为。In the present research, 2,4-Dichlorophenol （2,4-DCP）, an ionizable organic contaminant priority-controlled in many countries, was selected to study their sorption/desorption properties and mechanisms in Tai Lake sediments. In addition, the effects of some environmental factors, such as temperature, pH value and ionic strength, on the sorption isotherm of 2,4-DCP were explored. All that we have done may provide some useful theoretical data for the development of remediation technologies of sediment in the organic-contaminated lakes or shellow groundwaters. Experimental results showed a rapid sorption/desorption equilibrium of 2,4-DCP in the Tai Lake sediments in 4 hours. Either linear or Freundlich sorption isotherm can describe the sorption behaviors of 2,4-DCP in Tai Lake sediments. Therefore, the possible sorption mechanisms may include partition and adsorption. Temperature and ionic strength seemed to promote the sorption of 2,4-DCP to the sediment of Gong Lake, while pH value showed negligible effects. Moreover, a lag between sorption and desorption （ i.e., irreversible sorption） was observed, while the qmax^irr is about 4 μg·g^-1.

关 键 词：沉积物 2  4-二氯苯酚(2  4-DCP) 吸附 解吸 

分 类 号：X592[环境科学与工程—环境工程]