Adsorption behavior of perfluorochemicals (PFCs) on boehmite:influence of solution chemistry
With global distribution,persistence nature,and strong bioaccumulation,the fate and transport of perfluorooctanesulfonate (PFOS)and perfluorooctanoate (PFOA) in natural environment have recently attracted strong attentions.As boehmite is a common form of hydrated aluminum oxide existing in soils and sediments,this study successfully revealed the adsorption behavior of PFOS and PFOA on boehmite and the influence from solution chemistry.The results of kinetic experiments show that the adsorption equilibrium can be achieved within 48 hours and the boehmite surface is generally receptive to PFOS and PFOA adsorption.The adsorption isotherms estimated the maximum adsorption capacities of PFOS and PFOA on boehmite to be 0.877 μg/m2 and 0.633μg/m2,respectively.The increase of pH can lead to a moderate decrease of PFOS and PFOA adsorption,owing to the increase of ligand exchange reaction and the decrease of electrostatic interaction.With the compression of electrical double layers,the competitive adsorption from the other ions and the Ca2+ bridging effect between perfluorochemicals have demonstrated their negative influence for PFOS and PFOA adsorption on boehmite surface.Finally,humic acid (HA) also showed significant retardant effects on the sorption of perfluorooctanesulfonate (PFOS) and perfluorobutanesulfonate (PFBuS) on boehmite.
PFOS PFOA isotherm pH ionic strength humic acid
Kaimin Shih Fei Wang
The University ofHong Kong, Pokfulam Road, Hong Kong, Hong Kong SAR, China
国际会议
2013 International Symposium on Environmental Science and Technology(2013环境科学与技术国际会议)
大连
英文
86-91
2013-06-04（万方平台首次上网日期，不代表论文的发表时间）