Tong Huiyan, Hu Xingshuai, Zhong Xiaocong, Jiang Qianyi
Dalian University of Technology, School of Ocean Science and Technology, New District of Liaodong Bay, Panjin City, Liaoning Province, China.
Environ Toxicol Chem. 2021 Jan;40(1):72-78. doi: 10.1002/etc.4902. Epub 2020 Dec 1.
Biodegradable plastics have been increasingly used as a solution to the problem of plastic pollution in recent years. However, there are few studies on the negative effects of biodegradable microplastics. Triclosan, a widely used disinfectant, is a highly toxic substance. In the present study, the adsorption and desorption processes of triclosan on a type of biodegradable plastics, polyhydroxybutyrate (PHB), were investigated and also compared with one conventional plastic type, polyethylene. The adsorption equilibrium quantities of polyethylene and PHB were 3431.85 and 9442.27 μg/g, respectively. The adsorption rate and equilibrium adsorption capacity of triclosan on PHB are much higher than on polyethylene. Physical adsorption of triclosan on PHB and polyethylene microplastics may play a dominant role in this process. The desorption hysteresis indices are all less than zero; this indicates that triclosan is easily released from PHB and polyethylene microplastics under physiological conditions. Our results indicate that biodegradable PHB microplastics are stronger carriers for triclosan than the conventional polyethylene microplastics in the aquatic environment. Environ Toxicol Chem 2021;40:72-78. © 2020 SETAC.
近年来，可生物降解塑料作为解决塑料污染问题的一种方案，其使用越来越广泛。然而，关于可生物降解微塑料负面影响的研究却很少。三氯生是一种广泛使用的消毒剂，是一种剧毒物质。在本研究中，研究了三氯生在一种可生物降解塑料聚羟基丁酸酯（PHB）上的吸附和解吸过程，并与一种传统塑料聚乙烯进行了比较。聚乙烯和PHB的吸附平衡量分别为3431.85和9442.27μg/g。三氯生在PHB上的吸附速率和平衡吸附容量远高于在聚乙烯上的。三氯生在PHB和聚乙烯微塑料上的物理吸附在这一过程中可能起主导作用。解吸滞后指数均小于零；这表明在生理条件下，三氯生很容易从PHB和聚乙烯微塑料中释放出来。我们的结果表明，在水环境中，可生物降解的PHB微塑料作为三氯生的载体比传统的聚乙烯微塑料更强。《环境毒理学与化学》2021年；40：72 - 78。©2020 SETAC。
