A recyclable mercury(Ⅱ)optical sensor based on pyrene-functionalized core-shell magnetic silica nanosphereswas developed and demonstrated by sol-gel grafting reaction.The obtained multifunctional microspheres display...A recyclable mercury(Ⅱ)optical sensor based on pyrene-functionalized core-shell magnetic silica nanosphereswas developed and demonstrated by sol-gel grafting reaction.The obtained multifunctional microspheres displayed excellent fluorescence sensitivity and selectivity towards Hg^(2+)over other competing metal ions.A good linearity Stern-Volmer working plot(R2=0.9983)between the fluorescence intensity of multifunctional microspheres and the concentration of Hg^(2+)was constructed with a satisfactory detection limit of 2.3×10^(-8)mol·L^(-1).Their fluorescence response in the presence of Hg^(2+)is found to be almost reversible when treated by EDTA solution.Moreover,these pyrene-functionalized magnetic silica nanospheres can efficiently remove Hg^(2+)in aqueous solution and easily separated by appling an external magnetic field.These results indicate that functionalized core-shell magnetic silica microspheres are potentially promising materials for simultaneously detecting and removing environmental pollutants.展开更多
文摘A recyclable mercury(Ⅱ)optical sensor based on pyrene-functionalized core-shell magnetic silica nanosphereswas developed and demonstrated by sol-gel grafting reaction.The obtained multifunctional microspheres displayed excellent fluorescence sensitivity and selectivity towards Hg^(2+)over other competing metal ions.A good linearity Stern-Volmer working plot(R2=0.9983)between the fluorescence intensity of multifunctional microspheres and the concentration of Hg^(2+)was constructed with a satisfactory detection limit of 2.3×10^(-8)mol·L^(-1).Their fluorescence response in the presence of Hg^(2+)is found to be almost reversible when treated by EDTA solution.Moreover,these pyrene-functionalized magnetic silica nanospheres can efficiently remove Hg^(2+)in aqueous solution and easily separated by appling an external magnetic field.These results indicate that functionalized core-shell magnetic silica microspheres are potentially promising materials for simultaneously detecting and removing environmental pollutants.
