Construction of controllable size silver nanoparticles immobilized on nanofibers of chitin microspheres via green pathway

摘要: In the present work, nanofibrous chitin microsphere (NCM) was prepared via sol–gel transition from a solution dissolved in NaOH/urea aqueous system at low temperatures. Ag nanoparticles (AgNPs) were synthesized an situ reduction of silver nitrate using trisodium citrate dehydrate and immobilized on nanofibers to obtain composite microspheres that consist AgNPs (NCM-Ag). The size could be controlled range 10 70 nm, depending concentration AgNO3. X-ray photoelectron spectroscopy (XPS) Fourier transform infrared (FT-IR) analyses showed have strong affinity toward AgNPs, resulting interaction between acetamino group AgNPs. NCM-Ag exhibited perfect nanoporous structure high surface area, as well stability organic solvents. Moreover, catalytic epoxidation olefin (particularly, conversion styrene epoxide), excellent selectivity up 90%. Converting powder into environmentally friendly technique is green process, which beneficial for large-scale synthesis industrial products. More importantly, this work provides synthetic pathway construction size-controlled noble metal nanofiber support, wide potential applications.