Chang Lekai, Bai Shuli, Wei Ping, Gao Xingyue, Dong Jinfeng, Zhou Bingpu, Peng Chao, Jia Jianbo, Luan Tiangang
School of Environmental and Chemical Engineering, Jiangmen Key Laboratory of Synthetic Chemistry and Cleaner Production, Wuyi University, Jiangmen, 529020, Guangdong, China.
School of Pharmacy and Food Engineering, Wuyi University, Jiangmen, 529020, Guangdong, China.
Talanta. 2024 Jun 1;273:125859. doi: 10.1016/j.talanta.2024.125859. Epub 2024 Mar 1.
In this study, the plasmonic Ag nanoparticles (Ag NPs) were uniformly anchored on the high conductivity NbCT (MXene) nanosheets to construct an Ag/NbCT substrate for surface-enhanced Raman spectroscopy (SERS) detection of polystyrene (PS) nanoplastics. The KI addition (0.15 mol/L), the volume ratio between substrate colloid and nanoplastic suspension (2:1), and the mass ratio of NbCT in substrate (14%) on SERS performance were optimized. The EM hot spots of Ag/NbCT are significantly enlarged and enhanced, elucidated by FDFD simulation. Then, the linear relationship between the PS nanoplastics concentration with three different sizes (50, 300, and 500 nm) and the SERS intensity was obtained (R > 0.976), wherein, the detection limit was as low as 10 mg/mL for PS nanoplastic. Owing to the fingerprint feature, the Ag/NbCT-14% substrate successfully discerns the mixtures from two-component nanoplastics. Meanwhile, it exhibits excellent stability of PS nanoplastics on different detection sites. The recovery rates of PS nanoplastics with different sizes in lake water ranged from 94.74% to 107.29%, with the relative standard deviation (RSD) ranging from 2.88% to 8.30%. Based on this method, the expanded polystyrene (EPS) decomposition behavior was evaluated, and the PS concentrations in four water environments were analyzed. This work will pave the way for the accurate quantitative detection of low concentration of nanoplastics in aquatic environments.
在本研究中，将等离子体银纳米颗粒（Ag NPs）均匀地锚定在高导电性的NbCT（MXene）纳米片上，构建用于表面增强拉曼光谱（SERS）检测聚苯乙烯（PS）纳米塑料的Ag/NbCT基底。优化了KI添加量（0.15 mol/L）、基底胶体与纳米塑料悬浮液的体积比（2:1）以及基底中NbCT的质量比（14%）对SERS性能的影响。通过有限差分时域（FDFD）模拟表明，Ag/NbCT的电磁热点显著扩大和增强。然后，获得了三种不同尺寸（50、300和500 nm）的PS纳米塑料浓度与SERS强度之间的线性关系（R>0.976），其中，PS纳米塑料的检测限低至10 mg/mL。由于指纹特征，14%的Ag/NbCT基底成功地识别了两组分纳米塑料的混合物。同时，它在不同检测位点上对PS纳米塑料表现出优异的稳定性。湖水中不同尺寸PS纳米塑料的回收率在94.74%至107.29%之间，相对标准偏差（RSD）在2.88%至8.30%之间。基于此方法，评估了发泡聚苯乙烯（EPS）的分解行为，并分析了四种水环境中的PS浓度。这项工作将为水生环境中低浓度纳米塑料的准确定量检测铺平道路。
