阳离子表面活性剂对沉积物及其主要组分吸附双酚A的影响

Effects of the cationic surfactant on bisphenol A adsorption onto the surface sediment and its main components

采用吸附实验、选择性萃取技术研究阳离子表面活性剂——十六烷基三甲基溴化铵(CTMAB)对表层沉积物(生物膜)吸附双酚A(BPA)的影响规律,及CTMAB不同加入条件下对表层沉积物(生物膜)选择性萃取(铁氧化物、锰氧化物、有机质)后的组分吸附BPA的影响。CTMAB对表层沉积物(生物膜)吸附BPA起到促进作用,且随着CTMAB浓度的增加,其促进作用增强;CTMAB掺杂顺序对表层沉积物吸附BPA的影响较小,但对生物膜吸附BPA的影响较大;CTMAB的引入导致BPA在选择性萃取后的表层沉积物(生物膜)组分上的吸附量显著增加,并且CTMAB对表层沉积物(生物膜)吸附BPA的促进作用远大于表层沉积物(生物膜)自身主要组分理化性质的影响。选择性萃取证明,阳离子表面活性剂的引入能降低BPA在水体环境中的迁移转化能力。

Adsorption experiments followed by selective extraction techniques were employed to investigate effects of cationic sur- factant cetyltrimethylammonium bromide （CTMAB） on the adsorption of bisphenol A （BPA） onto surface sediments （SSs） and natu- ral surface coating samples （NSCSs） and the adsorption behavior of BPA to the main components via selective extraction （Fe oxides, Mn oxides, organic materials） with different addition orders of CTMAB. The results suggested that the application of CTMAB led to a dramatic increase in BPA adsorption, the increase being directly proportional to the concentration of CTMAB added. The addition orders of CTMAB have less effect on BPA adsorption onto SSs than that onto NSCSs. The application of CTMAB caused a signifi- cant increase in the adsorption of BPA onto the components of SSs and NSCSs after extraction treatments, and the promotive effect of CTMAB on BPA adsorption onto SSs and NSCSs is far more than that of the physiochemical characteristics of the main compo- nents in SSs and NSCSs. Selective extraction also showed that the application of CTMAB can reduce the ability of transport and fate of BPA in the aquatic environment.