聚合物老化对聚苯乙烯微塑料吸附 2,2',4,4'-四溴二苯醚的影响。
Effects of polymer aging on sorption of 2,2',4,4'-tetrabromodiphenyl ether by polystyrene microplastics.
机构信息
Qingdao Engineering Research Center for Rural Environment, Qingdao Agricultural University, Qingdao, 266109, China.
College of Life Sciences, Qingdao Agricultural University, Qingdao, 266109, China.
出版信息
Chemosphere. 2020 Aug;253:126706. doi: 10.1016/j.chemosphere.2020.126706. Epub 2020 Apr 9.
The sorption behavior of 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) on aged polystyrene (PS) microplastics via seawater soaking, ultraviolet (UV) irradiation, seawater soaking and UV irradiation together was investigated. The effects of environmental factors including salinity, pH, and dissolved organic matter (DOM) on sorption of BDE-47 by the aged PS microplastics were analyzed. The equilibrium sorption capacity of BDE-47 by virgin PS, aged PS with seawater soaking, aged PS with UV irradiation and aged PS with seawater soaking and UV irradiation was 6.16, 4.96, 3.53, and 3.75 ng/g, respectively. The decrease in sorption capacity was related to the increase of surface crystallinity and the appearance of surface oxygen-containing functional groups. The kinetic and isotherm models suggested that aging did not change the sorption mechanism of BDE-47 on PS microplastics. pH had negligible impacts on BDE-47 sorption by virgin and aged PS. Sorption capacity of BDE-47 on aged PS in water with high salinity was lower than that on virgin PS, and DOM has less effect on the sorption of BDE-47 on aged PS.
研究了经海水浸泡、紫外线（UV）辐照、海水浸泡和 UV 辐照共同作用后的老化聚苯乙烯（PS）微塑料对 2,2',4,4'-四溴二苯醚（BDE-47）的吸附行为。分析了盐度、pH 值和溶解有机物（DOM）等环境因素对老化 PS 微塑料吸附 BDE-47 的影响。BDE-47 在原始 PS、经海水浸泡的老化 PS、经 UV 辐照的老化 PS 和经海水浸泡和 UV 辐照的老化 PS 上的平衡吸附容量分别为 6.16、4.96、3.53 和 3.75 ng/g。吸附容量的降低与表面结晶度的增加和表面含氧官能团的出现有关。动力学和等温线模型表明，老化并未改变 BDE-47 在 PS 微塑料上的吸附机制。pH 值对原始 PS 和老化 PS 上 BDE-47 的吸附几乎没有影响。在高盐度水中，老化 PS 对 BDE-47 的吸附容量低于原始 PS，而 DOM 对老化 PS 上 BDE-47 吸附的影响较小。
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