Ultra-rapid and highly efficient enrichment of organic pollutants via magnetic mesoporous nanosponge for ultrasensitive nanosensors

Lingling Zhang, Yu Guo, Rui Hao, Yafei Shi, Hongjun You, Hu Nan, Yanzhu Dai, Danjun Liu, Dangyuan Lei and Jixiang Fang ()
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Lingling Zhang: Xi’an Jiaotong University
Yu Guo: Xi’an Jiaotong University
Rui Hao: Xi’an Jiaotong University
Yafei Shi: Xi’an Jiaotong University
Hongjun You: Xi’an Jiaotong University
Hu Nan: Xi’an Jiaotong University, Xi’an Jiaotong University
Yanzhu Dai: Xi’an Jiaotong University, Xi’an Jiaotong University
Danjun Liu: City University of Hong Kong
Dangyuan Lei: City University of Hong Kong
Jixiang Fang: Xi’an Jiaotong University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Currently, owing to the single-molecule-level sensitivity and highly informative spectroscopic characteristics, surface-enhanced Raman scattering (SERS) is regarded as the most direct and effective detection technique. However, SERS still faces several challenges in its practical applications, such as the complex matrix interferences, and low sensitivity to the molecules of intrinsic small cross-sections or weak affinity to the surface of metals. Here, we show an enrichment-typed sensing strategy with both excellent selectivity and ultrahigh detection sensitivity based on a powerful porous composite material, called mesoporous nanosponge. The nanosponge consists of porous β-cyclodextrin polymers immobilized with magnetic NPs, demonstrating remarkable capability of effective and fast removal of organic micropollutants, e.g., ~90% removal efficiency within ~1 min, and an enrichment factor up to ~103. By means of this current enrichment strategy, the limit of detection for typical organic pollutants can be significantly improved by 2~3 orders of magnitude. Consequently, the current enrichment strategy is proved to be applicable in a variety of fields for portable and fast detection, such as Raman and fluorescent sensing.

Date: 2021
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DOI: 10.1038/s41467-021-27100-2

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