Effect of model dissolved organic matter coating on sorption of phenanthrene by TiO2 nanoparticles
Effect of model dissolved organic matter coating on sorption of phenanthrene by TiO2 nanoparticles
复制标题
模型溶解有机物涂层对 TiO2 纳米粒子吸附菲的影响
DOI：
10.1016/j.envpol.2014.06.039
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发表时间：
2014-11-01
影响因子：
8.9
通讯作者：
Xing, Baoshan
中科院分区：
文献类型：
--
作者：
Wang, Xilong;Ma, Enxing;Xing, Baoshan
溶解的有机物（DOM）可能改变疏水有机污染物（HOC）对金属氧化物纳米颗粒（NPs）的吸附，但DOM和NP类型的作用尚不清楚。在这里，测定了四种纳米TiO2（三种金红石型，一种锐钛矿型）和散装原料TiO2粉末对菲的吸附。在吸附实验之前，这些纳米颗粒被四种不同的有机材料包裹：木质素（LIG）、单宁酸（TAN）、刚果红（CON）和capsorubin （CAP）。木质素、单宁酸、刚果红和衣红素涂层显著增强了各种TiO2颗粒对菲的吸附。经特定DOM包覆后，DOM包覆后的TiO2粒子在有机碳含量百分比和表面积（SA）基础上的K-d值（K-oc/SA）一般为：具有疏水表面的TiO2 NPs >本体TiO2粒子>其他TiO2 NPs。不同DOM- tio2配合物的K-oc/SA值的不同是由于包覆DOM的不同构象和聚集。(C) 2014 Elsevier Ltd.版权所有。
Dissolved organic matter (DOM) may alter the sorption of hydrophobic organic contaminants (HOC) to metal oxide nanoparticles (NPs), but the role of DOM and NP types is poorly understood. Here, phenanthrene sorption was quantified on four types of nano-TiO2 (three rutile, one anatase), and a bulk, raw TiO2 powder. Prior to the sorption experiments, these nanoparticles were coated using four different organic materials: Lignin (LIG), tannic acid (TAN), Congo red (CON), and capsorubin (CAP). Lignin, tannic acid, congo red and capsorubin coating substantially enhanced phenanthrene sorption to various TiO2 particles. After coating with a specific DOM, K-d values by the DOM-coated TiO2 particles on percent organic carbon content and surface area (SA) basis (K-oc/SA) generally followed the order: TiO2 NPs with hydrophobic surfaces > bulk TiO2 particles > other TiO2 NPs. Different K-oc/SA values of various DOM-TiO2 complexes resulted from distinct conformation of the coated DOM and aggregation. (C) 2014 Elsevier Ltd. All rights reserved.