摘要
探讨了溶解性有机质(Dissolved organic matter,DOM)与氧化铁复合形成的有机-无机复合体及其对菲(Phenanthrene,PHE)的吸附特征.结果表明,复合体制备过程中复合次数越大,有机碳含量越低,所复合的有机质极性越强;DOM芳香性组分优先吸附在氧化铁矿物表面.随着芳香性组分的优先吸附,之后发生的复合体中有机质的组分更加单一,可能更容易在无机矿物表面形成较有序的憎水性区域.复合在氧化铁表面的有机质对PHE的吸附占主导作用,而无机矿物组分氧化铁对PHE的吸附贡献很小.用有机碳对吸附系数进行标准化以后,吸附系数仍然有一定的差别,主要表现在:1)有机无机复合体上K oc值普遍高于胡敏酸;2)随着程序复合的进行,K oc值有增大的现象.
This paper focuses on the formation of organic-mineral complexes of dissolved organic matter （DOM） with oxide as well as their adsorption characteristics for phenanthrene （PHE）. Results showed that more sequential adsorption times and lower organic carbon content, led to stronger polarity of the complex. The aromatic fractions of DOM preferentially adsorbed on the surface of iron oxide minerals. With the aromatic fractions preferentially adsorbed, the organic fractions of the complexes became less, and some orderly hydrophobic regions formed on the the surface of minerals. DOM on the surface of iron oxide minerals played an important role for the adsorption of PHE, but the contribution of iron oxide minerals for PHE sorption was small. There were some differences between adsorption coefficients before and after normalization by organic carbon, it showed the follwing ： 1 ） the Koc of organic-mineral complexes was higher than the Koo of humic acid ; 2） Koo decreased with sequential adsorption.
出处
《环境化学》
CAS
CSCD
北大核心
2013年第12期2276-2281,共6页
Environmental Chemistry
基金
国家自然科学基金(41273138)
云南省学术带头人后备人才项目资助
关键词
溶解性有机质
氧化铁
有机碳
芳香性组分
吸附系数
dissolved organic matter, iron oxide, organic carbon, aromaticity, adsorption coefficient.
