Molecularly imprinted electrospun nanofibers for adsorption of 2,4-dinitrotoluene in water

Abstract

The detection and adsorption of nitroaromatic compounds such as 2,4-dinitrotoluene (DNT) is of great importance, but the selective detection of trace DNT in water remains a challenge. Here, we report molecularly imprinted polymer (MIP) nanofibers fabricated by electrospinning using DNT as a template molecule and poly(allylamine) as a functional macromer. The physical and chemical properties of the nanofibers were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM), and the DNT adsorption and selectivity properties were also studied by high performance liquid chromatography (HPLC). The results show that the nanofibers prepared using 20 wt% poly(ethylene terephthalate) (PET) in solvent had a good morphology and an optimal ratio of poly(allylamine) and DNT, and the imprinted nanofibers showed specific adsorption of DNT, in accordance with the Freundlich isotherm model and Scatchard analysis. Furthermore, the imprinted nanofibers showed remarkable stability and reusability, losing only 3% of their performance after eight cycles. Thus, the imprinted nanofibers fabricated by this strategy could be used for trace DNT extraction, separation, and further construction of sensors in the near future.

Dual-Channel Probe of Carbon Dots Cooperating with Lanthanide Complex Employed for Simultaneously Distinguishing and Sequentially Detecting Tetracycline and Oxytetracycline

“…The high resolution XPS of C 1s ( Figure 2 c) can be divided into to four peaks at 284.2, 284.8, 286.2, and 288.2 eV, demonstrating the existence of C-Si, C-C, C-O/C-N, and C=O bonds on the surface of nanoprobe [ 43 , 44 ]. The N 1s spectrum in Figure 2 d can be deconvoluted into three peaks, ascribed to N−H at 399.4 eV, N−C at 401.5 eV, and NO 3 − at 406.6 eV, respectively [ 45 , 46 ]. These results supported that cit-Eu complex had been successfully grafted on the surface of SiCDs@mMIP.…”

“…Firstly, the static quenching was excluded by the analysis of UV spectra. The UV-Vis absorption spectra of SiCDs, TC, and the mixture of SiCDs and TC ( Figure S8 ) indicated that there was no additional absorption bond, and the position of the absorption peak was hardly changed, indicating that there was no new substance formation [ 45 ]. Moreover, the fluorescence emission of SiCDs overlapped with the absorption spectrum of TC, and it can be speculated that the fluorescence quenching may be caused by IFE or FRET [ 32 ].…”

Fabrication of Magnetic Molecularly Imprinted Beaded Fibers for Rosmarinic Acid

“…The polymer concentration played the most crucial role during fiber formation within this study, whereby the changes in concentration led to the formation of electrospun mats of different morphologies, i.e., either beads, beaded fibers, or uniform fibers with different FD. The fiber morphology is mainly controlled by the charge carrying density, surface tension, and the viscoelasticity of the microemulsion being electrospun, which are factors mainly affected by the polymer concentration [ 34 ].…”

“…This leads to a more uniform fiber morphology with increased FD. At the highest concentrations, further increase in FD is no longer observed, as the increase in viscosity and polymer chain entanglement renders the ejection of the polymer jet more difficult [ 34 , 35 , 36 ].…”

Multifiber solid‐phase microextraction using different molecularly imprinted coatings for simultaneous selective extraction and sensitive determination of organophosphorus pesticides

“…Up to now, the reported preparation methods for MIP coatings include co‐polymerization , sol‐gel technique , electrochemical method , and so on. A uniform and compact coating with high adhesive strength can be obtained by co‐polymerization method, which is most widely used.…”