Preparation Of QTPA-SBA-15 And Fe₃O₄@PEI@Au,Properties Of Their Adsorption And Catalysis

Recent years, nano materials are paid much more attention because of their particular character. They have large specific surface area, regular architecture and open framework, well-defined and controllable pore size, well-modified surface properties and flexible attach fraction, these characters are different from other materials.This paper mainly introduces two nano materials, one is SBA-15,and the other is Fe3O4. Our work was begun from the synthesis means and the applying of them.1. The current situation of the pollution of heavy metal in recent years, the means for removing heavy metal ions, the progress of removing heavy metal ions and the synthesis of the molecular sieve, modified research about molecular sieve are briefly summarized.2. The synthesis of adsorbent of 8-aminoquinoline group modified SBA-15 and make it use for removing heavy metal from water are represented. This adsorbent material was tested by XRD, FT-IR spectra, TEM and TGA. Characterization exhibits that the incorporation of organic chains did not affect the original ordered porous structure of SBA-15. Batch adsorption experiments were conducted to investigate the main relevant parameters, such as pH, adsorption time, and initial ions concentration. The adsorption results revealed that the optimal pH values are 6.0 and 2.0 for Zn2+ and Cd2+ ions, respectively; and the time of maximum adsorption amount is about 120 min for both of them.3. The synthesis and the applied range of magnetical nano material are described.4. A facile method to synthesize magnetic compound material Fe3O4@PEI and magnetite-gold nanocomposites Fe3O4@PEI@Au via a biocompatible polyelectrolyte-polyethyleneimine (PEI) are recommended. PEI acts dual function for attaching gold nanoparticles and preventing the formation of large aggregates. The reduction of 4-nitrophenol to 4-aminophenol by NaBH4 as a model reaction evaluate its catalytic activity. The catalyst is charactered by TEM, XRD, TGA, FT-IR, XPS and VSM. The TEM photograph indicates that gold nanoparticle is grafted in Fe3O4@PEI obviously, and the diameter of gold nanoparticle is about 2nm. The Fe3O4@PEI@Au catalyst exhibits high activity and reusability in the catalytic reduction of 4-nitrophenol, meanwhile, the catalytic activity is still good after the catalyst was used for ten times.