Molecularly imprinted polymer coating on metal‐organic frameworks for solid‐phase extraction of fluoroquinolones from water

Abstract

In this work, a novel surface molecularly imprinted polymer with high adsorption capacity, high adsorption rate, and high selectivity for fluoroquinolones was prepared on the surface of UiO‐66‐NH2, which is a kind of metal‐organic framework. The surface morphology and adsorption properties of this molecularly imprinted polymer were investigated. The maximum adsorption capacity was 99.19 mg/g, and adsorption equilibrium was achieved within 65 s. Combined with reversed‐phase high‐performance liquid chromatography, the molecularly imprinted polymer was used to selectively enrich, separate and analyze fluoroquinolones present in lake water. The results showed that the recoveries of the four fluoroquinolones were 92.6–100.5%, and the relative standard deviations were 2.9–6.4% (n = 3). The novel molecularly imprinted polymer is an excellent adsorbent and has broad application prospects in the enrichment and separation of trace analytes in complex samples.

Rapid Measurement of Residual Kanamycin Using Highly Specific Biomimetic Recognition Paper-Based Chip

“…In comparing the coefficient of determination of the two models, the Langmuir isotherm model fitted the isothermal adsorption data better, demonstrating that monolayer adsorption of MIP occurred on the homogeneous surface and the imprinting sites were uniformly distributed. 40 Adsorption Kinetics. The adsorption of kanamycin by FZS-BA@MIP displayed a rapid adsorption rate in the first 15 min and gradually reached adsorption equilibrium after 20 min, while the adsorption performance for kanamycin by FZS-BA@ NIP was considerably lower (Figure 4c).…”

“…The experiments took place for 1 h at room temperature. The supernatant was passed through a 0.22 μm filter membrane to detect the residual kanamycin by HPLC, and the adsorption capacity ( Q e ) was calculated according to eq Q normale = ( C 0 − C e ) V / m where Q e (mg g –1 ) is the adsorption capacity, C 0 (mg L –1 ) is the initial concentration of the kanamycin solution, C e (mg L –1 ) is the equilibrium concentration, V (L) is the volume of the kanamycin solution, and m (g) is the mass of FZS-BA@MIP or FZS-BA@NIP.…”

“…The supernatant was passed through a 0.22 μm filter membrane to detect the residual kanamycin by HPLC, and the adsorption capacity (Q e ) was calculated according to eq 1. 40 Q…”

“…Scatchard analysis and isothermal adsorption models (Langmuir and Freundlich model) were performed based on the static adsorption data to investigate the adsorption properties of the materials. 40 The detailed information can be found in the Supporting Information.…”

Monodisperse restricted access material with molecularly imprinted surface for selective solid‐phase extraction of 17β‐estradiol from milk

“…Molecularly imprinted polymers (MIPs) are synthetic polymer materials with tailor-made recognition sites for a specific target molecule, which can selectively recognize a particular chemical in the presence of interfering species [13,14]. The recognition sites are imprinted in the polymer matrix by the presence of a template molecule during synthesis, and form according to the shape, size, and functional groups of this template [15,16]. When the template molecules are removed, three-dimensional structural cavities remain in the polymer with similar spatial configuration to the template molecule, and these structural cavities are able to selectively recognize and rebind template molecules [17][18][19].…”