College of Science, Hohai University, Changzhou, 213022, China.
Research Institute of Ocean and Offshore Engineering, Hohai University, Nantong, 226300, China.
Phys Chem Chem Phys. 2022 May 18;24(19):12036-12042. doi: 10.1039/d1cp05870c.
Due to overuse of plastic products, decomposed microplastics (MPs) are widely spread in aquatic ecosystems, and will cause irreparable harm to the human body through the food chain. Traditional MP detection methods require cumbersome sample pre-processing procedures and complex instruments, so there is an urgent demand to develop methods to achieve simple on-site detection. Herein, a simple, sensitive, accurate, and stable MP detection method based on surface-enhanced Raman scattering (SERS) is investigated. Considering the hydrophobic problems of MPs, gold nanoparticle (AuNP) doped filter paper as a flexible SERS substrate is applied to capture MPs in the fiber pores. Benefitting from the electromagnetic (EM) hot spots generated by AuNPs, the Raman signal of MPs can be effectively enhanced. Meanwhile, the flexible SERS substrate has good sensitivity to a minimum detectable concentration of 0.1 g L for polyethylene terephthalate (PET) in water, and the maximum enhancement factor (EF) can reach 360.5. Furthermore, the practicability of the developed method has been proved by the successful detection of MPs in tap water and pond water. This research provides an easy process, high sensitivity, and good reproducibility method for MP detection.
由于塑料制品的过度使用，已分解的微塑料（MPs）广泛分布在水生生态系统中，并将通过食物链对人体造成不可挽回的伤害。传统的 MPs 检测方法需要繁琐的样品预处理程序和复杂的仪器，因此迫切需要开发简单的现场检测方法。在此，研究了一种基于表面增强拉曼散射（SERS）的简单、灵敏、准确、稳定的 MPs 检测方法。考虑到 MPs 的疏水性问题，将金纳米粒子（AuNP）掺杂滤纸作为柔性 SERS 基底应用于纤维孔中捕获 MPs。受益于 AuNPs 产生的电磁（EM）热点，MPs 的拉曼信号可以得到有效增强。同时，柔性 SERS 基底对水中聚对苯二甲酸乙二醇酯（PET）的最小可检测浓度具有良好的灵敏度，可达 0.1 g/L，最大增强因子（EF）可达 360.5。此外，通过成功检测自来水中和池塘水中的 MPs，证明了所开发方法的实用性。该研究为 MPs 检测提供了一种简单的过程、高灵敏度和良好重现性的方法。
