title: Directed assembly of bifunctional silica-iron oxide nanocomposite with open shell structure.
abstract: The synthesis of nanocomposite with controlled surface morphology plays a key role for pollutant removal from aqueous environments. The influence of the molecular size of the polyelectrolyte in synthesizing silica-iron oxide core-shell nanocomposite with open shell structure was investigated by using dynamic light scattering, atomic force microscopy, and quartz crystal microbalance with dissipation (QCM-D). Here, poly(diallydimethylammonium chloride) (PDDA) was used to promote the attachment of iron oxide nanoparticles (IONPs) onto the silica surface to assemble a nanocomposite with magnetic and catalytic bifunctionality. High molecular weight PDDA tended to adsorb on silica colloid, forming a more extended conformation layer than low molecular weight PDDA. Subsequent attachment of IONPs onto this extended PDDA layer was more randomly distributed, forming isolated islands with open space between them. By taking amoxicillin, an antibiotic commonly found in pharmaceutical waste, as the model system, better removal was observed for silica-iron oxide nanocomposite with a more extended open shell structure.
authors.affiliation: School of Chemical Engineering, Universiti Sains Malaysia , 14300 Nibong Tebal, Penang, Malaysia.
authors.forename: Hui Xin
authors.initials: HX
authors.lastname: Che
authors.forename: Swee Pin
authors.initials: SP
authors.lastname: Yeap
authors.forename: Mohamed Syazwan
authors.initials: MS
authors.lastname: Osman
authors.forename: Abdul Latif
authors.initials: AL
authors.lastname: Ahmad
authors.forename: JitKang
authors.initials: J
authors.lastname: Lim
mesh_terms: D000658:Amoxicillin / Q000302:isolation & purification; D000900:Anti-Bacterial Agents / Q000302:isolation & purification; D005290:Ferric Compounds / Q000737:chemistry*; D057446:Hydrodynamics; D008027:Light; D018625:Microscopy, Atomic Force; D008970:Molecular Weight; D053761:Nanocomposites / Q000737:chemistry*; D009994:Osmolar Concentration; D011095:Polyethylenes / Q000737:chemistry; D058525:Quartz Crystal Microbalance Techniques; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D012542:Scattering, Radiation; D012822:Silicon Dioxide / Q000737:chemistry*; D055672:Static Electricity
chemical_list: D000900:Anti-Bacterial Agents; D005290:Ferric Compounds; D011095:Polyethylenes; D000644:Quaternary Ammonium Compounds; C000499:ferric oxide; C041004:poly-N,N-dimethyl-N,N-diallylammonium chloride; D012822:Silicon Dioxide; D000658:Amoxicillin
keywords: amoxicillin degradation; iron oxide nanoparticles; nanocomposite; open shell structure; silica colloid