Factor effects and mechanisms of the adsorption of Hg(II), Cd(II) and Ni(II) on charged liposomes
文献类型： 外文期刊
作者： Gong, Wenwen 1 ; Yu, Yanjun 1 ; Liang, Gang 2 ; Liu, Xinhui 1 ; Cui, Baoshan 1 ; Bai, Junhong 1 ; Han, Ping 2 ;
作者机构： 1.Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China
2.Beijing Acad Agr & Forestry Sci, Beijing Res Ctr Agr Stand & Testing, Beijing 100097, Peoples R China
关键词： Negatively charged liposomes;Heavy metals;Adsorption;Effect factors;Interaction mechanism
期刊名称：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS （ 影响因子：4.539； 五年影响因子：4.039 ）
ISSN： 0927-7757
年卷期： 2018 年 538 卷
页码：
收录情况： SCI
摘要： Negatively charged liposomes prepared by solvent evaporation method were characterized by transmission electron microscopy, Raman spectroscopy and differential scanning calorimetry. The adsorption of Ni(II), Cd(II) and Hg(II) on the liposomes was systematically investigated. Special attention was paid to the effect of pH, ionic strength and the particle size of liposomes on the adsorption behavior. The increase of pH (from 6.5 to 8.1) enhanced the adsorption capacity (Qe) of three metals due to its effect on metal ions speciation and the conformation of polar phosphatidyl groups (active sites) on the liposome surfaces. The presence of ions slightly weakened the Qe of Ni(II) (p > 0.05) and Cd(II) (p < 0.05); while for Hg(II) adsorption at higher ionic strength (0.5 mol/ L), obvious stratification and precipitation was observed. Particle size of liposomes also influenced the adsorption process. Specifically, smaller unilamellar liposome vesicles after extrusion were more beneficial to the adsoprtion of Hg(II) (p < 0.01); while larger multilamellar vesicles carried more negative charges benefit the adsoprtion of Ni(II) (p < 0.01) and Cd(II) (p < 0.05) rather than smaller unilamellar vesicles. Additionally, the sudden rises of the adsorption amount were observed for Cd(II) and Hg(II) and to a less extent for Ni(II), probably because of the changes of the structures or properties of liposomes, i.e., the fusion of vesicles, in the presence of high concentration of heavy metals.
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