Qian Wen’s research while affiliated with Jilin University and other places

Magnetic microspherical β-cyclodextrin(CD)/Fe3O4@polyvinylpyrrolidone(PVP) particles, in which embedded Fe3O4 particles were coated by β-CD/glutaraldehyde crosslinked PVP, were synthesized via electrostatic spray and thermal crosslinking technologies. The magnetic microspheres were characterized by infrared spectroscopy, X-ray diffraction, scanning electron microscopy(SEM) and magnetic measurements, and the adsorption performance of the β-CD/Fe3O4@PVP composite nanoparticles for methyl orange was studied. The results show that the β-CD/Fe3O4@PVP microspheres could be quickly separated from the adsorption system under an external magnetic field within 30 s and that the adsorption capacity of the microspheres for methyl orange reaches greater than 90%, with a maximum adsorption quantity of 47.62 mg/g.

The insoluble β-cyclodextrin/glutaraldehyde crosslinked polyvinylpyrrolidone nanofibrous membranes were prepared by electrospinning technique. The membranes were extensively characterized by various techniques including attenuated total reflectance Fourier transform infrared spectroscopy(ATR-FTIR), X-ray diffraction(XRD), scanning electron microscopy(SEM) and UV-visible absorption to correlate membrane characteristics with their performance. The adsorption ability of the nanofibrous membranes was tested by performing extraction of Methyl orange(MO) dye in water. It was observed that β-cyclodextrin incorporated in polyvinylpyrrolidone provided the characteristics of high adsorption capacity of polyvinylpyrrolidone. Results of sorption experiments show that the nanofibrous membranes exhibited an adsorption rate of more than 95% for MO and the MO absorbent was 39.82 mg to per gram of β-cyclodextrin glutaraldehyde(β-CDXFM) crosslinked PVP under the optimized experimental conditions.

A novel naphthalimide-based fluorescent sensor bearing the N,N'-bis(salicylidene)diethylenetriamine receptor was developed, which exhibited dual signaling behaviors for Cd(2+) and Cu(2+), and was applicable to the environmental and biological milieus. Upon addition of Cd(2+), the fluorescence intensity enhanced in a linear fashion with the maximum fluorescence intensity increase of about 4-fold. Moreover, with the sensor and -Cd(2+) complex, Cu(2+) was easily recognized by marked fluorescence quenching. The selectivity and sensitivity of the sensor for Cd(2+) were satisfactory and achieving a detection limit at the nanomolar level. The living cell image experiments demonstrated the value of sensor in fluorescent visualization of Cd(2+) ions in biological systems.