Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
Environ Sci Technol. 2012 Jul 3;46(13):7252-9. doi: 10.1021/es301386z. Epub 2012 Jun 20.
The sorption behavior of four hydrophobic organic contaminants (HOCs) (i.e., phenanthrene, naphthalene, lindane, and 1-naphthol) by three types of polymers namely polyethylene (PE), polystyrene (PS), and polyphenyleneoxide (PPO) was examined in this work. The organic carbon content-normalized sorption coefficients (K(oc)) of phenanthrene, lindane, and naphthalene by PEs of same composition but distinct physical makeup of domains increased with their crystallinity reduction (from 58.7 to 25.5%), suggesting that mobility and abundance of rubbery domains in polymers regulated HOC sorption. Cross-linking in styrene-divinylbenzene copolymer (PS2) created substantial surface area and porosity, thus, K(oc) values of phenanthrene, lindane, naphthalene, and 1-naphthol by PS2 were as high as 274.8, 212.3, 27.4, and 1.5 times of those by the linear polystyrene (PS1). The K(oc) values of lindane, naphthalene, and 1-naphthol by polar PPO were approximately 1-3 orders of magnitude higher than those by PS1, and PPO had comparable sorption for phenanthrene but higher sorption for naphthalene and 1-naphthol than PS2. This can be a result that a portion of O-containing moieties in PPO were masked in the interior part, while leaving the hydrophobic domains exposed outside, therefore demonstrating the great influence of the spatial arrangement of domains in polymers on HOC sorption.
在这项工作中，研究了三种类型的聚合物（即聚乙烯（PE）、聚苯乙烯（PS）和聚苯醚（PPO））对四种疏水性有机污染物（HOCs）（即菲、萘、林丹和 1-萘酚）的吸附行为。具有相同组成但不同域物理结构的 PEs 对菲、林丹和萘的有机碳归一化吸附系数（Koc）随其结晶度降低（从 58.7 降至 25.5%）而增加，表明聚合物中橡胶域的流动性和丰度调节了 HOC 的吸附。苯乙烯-二乙烯基苯共聚物（PS2）中的交联产生了大量的表面积和孔隙率，因此，PS2 对菲、林丹、萘和 1-萘酚的 Koc 值分别高达线性聚苯乙烯（PS1）的 274.8、212.3、27.4 和 1.5 倍。极性 PPO 对林丹、萘和 1-萘酚的 Koc 值比 PS1 高约 1-3 个数量级，而 PPO 对菲的吸附能力与 PS1 相当，但对萘和 1-萘酚的吸附能力比 PS2 高。这可能是由于 PPO 中部分含 O 基团在内部被屏蔽，而疏水性域则暴露在外部，因此表明聚合物中域的空间排列对 HOC 吸附有很大影响。
