A core-shell-satellite structured Fe3O4@MIL-100(Fe)@Ag SERS substrate with adsorption, detection, degradation and recovery functionalities for selective detection of cationic dyes

• Published in: Microchemical journal Vol. 183; p. 108137
• Main Authors: Lv, Mingchun, Sun, Da-Wen, Pu, Hongbin, Zhu, Haofan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-12-2022
• Subjects: Cationic dyes; Core–shell-satellite structure; Fe3O4@MIL-100(Fe)@Ag nanoparticles; Recovery; SERS substrate; Recovery; Core–shell-satellite structure; SERS substrate; Fe3O4@MIL-100(Fe)@Ag nanoparticles; Cationic dyes
• ISSN: 0026-265X; 1095-9149
• DOI: 10.1016/j.microc.2022.108137

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•Recyclable SERS substrate of Fe3O4@MIL-100(Fe)@Ag was successfully synthesized.•This substrate can selectively detect and eliminate cationic dyes.•The detection limit of crystal violet was estimated to be as low as 14 ng/L.•This substrate can be reused at least 5 times.•This substrate exhibits excellent SERS activity, sensitivity, uniformity and stability.
Recyclable surface-enhanced Raman scattering (SERS) substrates are beneficial to cost reduction and environmental protection and have always been a research topic with great interest. Herein, a core–shell-satellite structured SERS substrate Fe3O4@MIL-100(Fe)@Ag nanoparticles (FMAs) was developed, possessing versatile functionalities of adsorption, detection, degradation and recovery. Results showed that the MIL-100(Fe) with peroxidase-like activity as shell catalyzed H2O2 to generate ·OH degraded pollutants within 5 min to achieve substrate cleaning, making FMAs recyclable for at least 5 times to sequentially detect different cationic dyes with high sensitivity, having low detection limits as low as 15.24 ng/L, 387.87 ng/L and 0.71 ng/g for crystal violet in deionized water, aquaculture water and tilapia, respectively. FMAs also showed good uniformity, reproducibility and stability, with a relative standard deviation value of 5.58 % between substrates and about 78.60 % SERS activity remained after 20 d storage at 4 °C. This FMAs substrate thus has great potential for selective detection of trace cationic dyes in food or other fields.