Contribution of coated humic acids calculated through their surface coverage on nano iron oxides for ofloxacin and norfloxacin sorption
Contribution of coated humic acids calculated through their surface coverage on nano iron oxides for ofloxacin and norfloxacin sorption
复制标题
通过纳米氧化铁的表面覆盖计算包覆腐植酸对氧氟沙星和诺氟沙星吸附的贡献
DOI：
10.1016/j.envpol.2015.04.029
复制
发表时间：
2015
影响因子：
8.9
通讯作者：
Xing Baoshan
中科院分区：
文献类型：
--
作者：
Peng Hongbo;Liang Ni;Li Hao;Chen Fangyuan;Zhang Di;Pan Bo;Xing Baoshan
有机矿物配合物对有机污染物的吸附已经进行了广泛的研究，但在计算koc之前，没有很好地解决矿物颗粒的吸附贡献，特别是离子有机污染物。在一系列合成的有机矿物配合物中，我们测量了腐植酸（HA）在纳米氧化铁（n-Fe2O3）上的表面覆盖率。包被的HA对氧氟沙星（OFL）和诺氟沙星（NOR）在HA - n- fe2o3配合物中的吸附贡献超过80%，表面覆盖率为36%，foco为1.6%。与原始HA相比，所有包覆的HA对NOR和OFL的吸附性都更高，这表明HA在有机矿物复合物形成过程中发生了分异和/或物理再构象。多层涂层的koc降低可能表明位点特异性相互作用对OFL吸附的重要性，而多层涂层的koc增加可能表明疏水区分配对NOR吸附的重要性。
Sorption of organic contaminants on organo-mineral complexes has been investigated extensively, but the sorption contribution of mineral particles was not properly addressed before calculatingKOC, especially for ionic organic contaminants. We measured the surface coverage of a humic acid (HA) on nano iron oxides (n-Fe2O3) in a series of synthesized organo-mineral complexes. The contribution of the coated HA to ofloxacin (OFL) and norfloxacin (NOR) sorption in HA–n-Fe2O3complexes was over 80% of the total sorption with the surface coverage of 36% andfOCof 1.6%. All the coated HA showed higher sorption to NOR and OFL in comparison to the original HA, suggesting HA fractionation and/or physical re-conformation during organo-mineral complex formation. The decreasedKOCwith multilayer coating may suggest the importance of site-specific interactions for OFL sorption, while the increasedKOCwith multilayer coating may suggest the importance of partitioning in hydrophobic region for NOR sorption.