Wang Shenjun, Tan Xiaonan, Wu Yuhao, Zhang Jun, Tian Zhiyuan, Ma Jiahai
School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
J Hazard Mater. 2024 Feb 5;463:132840. doi: 10.1016/j.jhazmat.2023.132840. Epub 2023 Oct 23.
Rapid isolation of microplastics is the prerequisite for correct and in-depth understanding of their environmental impacts and human health threats. And Fenton's reagent (Fe/HO system, FHS) has been proven to be a viable way to isolate microplastics from wastewater, but it is limited because of harsh reaction conditions, long reaction time and low efficiency. Herein, it's proven that the Fenton-like system, which is using Cobalt (II) salts to decompose potassium peroxymonosulfate (Co/PMS system, CPS) with generation of O, can offer shorter time (within 30 min) in complex sample isolation. The experimental results showed that the isolation time of micro/nanoplastics from pollutants with CPS in only 30 min, while it was at least more than 5 h with FHS. Via a serious of experiments of comparison and characterization between FHS and CPS, whether from the point of view of reaction time or isolation effect, CPS is superior to FHS. On this basis, we validate the applicability of this system (CPS) in different reaction conditions (concentration, pH), different sizes (from microns to nanometers) and types of plastic (PS, PA, PE, PP, PVC). In addition, the CPS can also preserve the integrity of the plastic itself and reduce the impact on the quality of samples evidenced by a variety of characterization of physicochemical structure like UV-vis, TEM, AFM, FTIR and XPS. CPS is proved to be faster, higher, stronger for enhancing the isolation of micro/nanoplastics from complex matrix. In a word, this study provides a promising solution for the efficient isolation of microplastics from wastewater without causing additional harm to the plastics.
快速分离微塑料是正确、深入了解其对环境影响及人类健康威胁的前提。芬顿试剂（铁/过氧化氢体系，FHS）已被证明是从废水中分离微塑料的一种可行方法，但由于反应条件苛刻、反应时间长且效率低而受到限制。在此，已证明类芬顿体系，即使用钴（II）盐分解过一硫酸钾（钴/过一硫酸钾体系，CPS）并产生氧，可在复杂样品分离中提供更短的时间（30分钟内）。实验结果表明，用CPS从污染物中分离微/纳米塑料的时间仅为30分钟，而用FHS则至少超过5小时。通过对FHS和CPS进行一系列比较和表征实验，无论是从反应时间还是分离效果来看，CPS都优于FHS。在此基础上，我们验证了该体系（CPS）在不同反应条件（浓度、pH值）、不同尺寸（从微米到纳米）和不同类型塑料（PS、PA、PE）、PP、PVC）中的适用性。此外，CPS还能保持塑料本身的完整性，并通过紫外可见光谱、透射电子显微镜、原子力显微镜、傅里叶变换红外光谱和X射线光电子能谱等多种物理化学结构表征证明其对样品质量的影响较小。事实证明，CPS在从复杂基质中增强微/纳米塑料的分离方面更快、更高、更强。总之，本研究为从废水中高效分离微塑料提供了一种有前景的解决方案，且不会对塑料造成额外损害。
