邻苯二甲酸二丁酯在海洋沉积物上的吸附行为

Sorption Behavior of Di-n-Butyl Phthalate on Marine Sediments

本文对常用塑料增塑剂邻苯二甲酸二丁酯(DBP)在海洋沉积物上的吸附行为进行研究,发现它的吸附机理主要是在沉积物上的有机质间分配及表面吸附和微孔作用,吸附与有机质含量和黏土矿物的含量有一定的相关性。在实验浓度范围内,DBP在3种不同处理方式沉积物上的吸附行为分别可以用Linear和Freundlich等温式来描述。通过改变吸附条件发现,随着盐度减小、温度的增加,吸附能力减小;而随酸度的升高,吸附能力先升高后下降。此外,通过向体系中加入不同表面活性剂来模拟双溶质体系的方法,对DBP与表面活性剂的竞争吸附行为进行了研究。结果发现,十六烷基三甲基溴化铵(CTAB)和吐温80(Tween80)的加入使DBP的吸附能力增强;十二烷基苯磺酸钠(SDBS)的加入使DBP的吸附能力降低。

The sorption behavior of di-n-butyl phthalate（DBP） on marine sediments was investigated.It was found that sediment organic carbon,surface adsorption and micropore effect played important roles on the sorption mechanism of DBP,and the sediment organic carbon and clay mineral contents had significant correlations with the adsorption of DBP.Sorption behaviors of DBP on HCl and H2O treatment sediments were fit with linear isotherms and those on H2O2 treatment sediments were fit with Freundlich isotherms very well over the concentration range.When the experimental condition was changed,it was found that the sorption capacity was favorably influenced by decreasing ionic strength and temperature of seawater.Furthermore,different surfactants were added to simulate double-solute system for the study of competitive adsorption behavior of DBP with other organic substances.The result showed that the adsorption of DBP increased with increasing concentrations of Tween 80 and hexadecyltrimethylammonium bromide（CTAB）.However,the adsorption decreased with increasing concentration of sodium dodecylbenzenesulfonate（SDBS）.