核壳式磁性微球催化的Knoevenagel反应

Fe₃O₄@SiO₂-NH₂-CMC magnetic nanoparticles(MNPs) could be prepared by covalent modification method via the modification of sodium carboxymethyl cellulose (CMC). IR spectra could be used for the determination of Fe₃O₄@SiO₂-NH₂, Fe₃O₄@SiO₂-NH₂-CMC, Fe₃O₄@SiO₂-NH₂-CMC/MOF5, and Fe₃O₄@SiO₂-NH₂-CMC/IRMOF3 nanoparticles. The results showed that the polysaccharide modification and core-shell modification were successful. Knoevenagel condensation experiments exhibited that, as forFe₃O₄@SiO₂-NH₂-CMC/IRMOF3, the best conversion rate could be obtained.     

基于SWCNTs的环丙沙星荧光增敏法研究

SWCNTs-PEG-NH₂, SWCNTs-2,3-NH₂ and SWCNTs-3,4-NH₂ nanoparticles could beprepared by covalent modification method of single-walled carbon nanotubes(SWCNTs). The structure ofSWCNTs-PEG-NH₂, SWCNTs-2,3-NH₂ and SWCNTs-3,4-NH₂ nanoparticles could be determined byXPS(X-ray photoelectron spectroscopy). The results showed that the amidation reactions were successful.Ciprofloxacin(CIP) extraction experiments exhibited that, as for SWCNTs-PEG-NH₂, the best adsorptioncould be obtained at pH=4 and pH=6, while elution conditions of 0.1mol/L NaOH and 1% SDS could achieve better elution effect. As for SWCNTs-2,3-NH 2 and SWCNTs-3,4-NH₂ , the best adsorption couldbe obtained at pH=6, while the elution condition of 1% SDS could achieve the best elution effect. The addition of Al³⁺ions could sensitize the fluorescence of ciprofloxacin.     

核壳式磁性微球用于头孢替唑钠萃取的荧光法研究

将γ-Fe₂O₃作为底物,利用硅酸四乙酯制备出了γ-Fe₂O₃@SiO₂纳米粒子,通过硅烷偶联剂制得了γ-Fe₂O₃@SiO₂-NH₂纳米粒子,通过共价修饰利用戊二酸酐合成了γ-Fe₂O₃@SiO₂-NH₂-COOH纳米粒子.进而通过Zr-MOFs核壳修饰得到合成的γ-Fe₂O₃@SiO₂-NH₂-COOH/Zr-MOFs(包括γ-Fe₂O₃@SiO₂-NH₂-COOH/UiO-66,γ-Fe₂O₃@SiO₂-NH₂-COOH/UiO-66-NH...     

L-苯丙氨酸的氨基功能化γ-Fe2O3磁固相萃取(英文)

通过不同的修饰方法制备了以γ-Fe₂O₃为核的四种氨基化的磁性纳米材料分别为γ-Fe₂O₃@SiO₂-cysteamine, γ-Fe₂O₃@SiO₂-PEI, γ-Fe₂O₃@SiO₂-G1.0, γ-Fe₂O₃@SiO₂-APTMS.在吸附时间为0.5, 1, 2,4, 8 h, p H=3, 5, 7, 9, 11的条件下，通过磁固相萃取的方法吸附浓度为2.5×10-6 mol/L的苯丙氨酸，随后用荧光分光光度计检测上清液的荧光强度，荧光强度越低说明纳米材料的吸附效果越优秀.通过试验后发现γ-Fe₂O₃@SiO₂-G1.0磁性纳米粒子在p H=5,吸附时间为8 h的条件下的吸附性最好. γ-Fe₂