Synthesis and Characterization of Co-Ce Codoped TiO₂/SiO₂/NiFe₂O₄ Magnetic Mesoporous Microspheres

Abstract:

Polystyrene/SiO2/NiFe2O4 magnetic microspheres were prepared by emulsion polymerization using NiFe2O4 nanoparticles as magnetic carriers, styrene and tetraethoxysilane as raw materials, and 3-Methacryloxypropyltrimethoxysilane as a cross-linking agent. Co-Ce codoped TiO2/SiO2/NiFe2O4 magnetic mesoporous microspheres material were prepared by sol-gel process with tetrabutyl titanate as raw materials，Co and Ce as doping ions, PS-SiO2/NiFe2O4 particles as the cores, sodium dodecyl sulfate and polyvinylpyrrolidone as templates. The crystal structure and surface morphology of Co-Ce Codoped TiO2/SiO2/NiFe2O4 magnetic mesoporous microspheres were characterized by vibrating sample magnetometer(VSM)，X-ray diffraction(XRD)，scanning electron microcopy(SEM)，UV-Vis diffuse reflectance spectroscopy( DRS) and temperature programmed desorption of oxygen(TPD). The results indicated that Co-Ce codoped TiO2/SiO2/NiFe2O4 particles were mesoporous microspheres with core-shell structure. The red shift of the absorption spectrum of Co-Ce codoped TiO2/SiO2/NiFe2O4 was observed by Co-Ce codoping, which enlarge the photoresponse range and surface oxygen storage of TiO2.

• Periodical: Advanced Materials Research (Volumes 535-537)
• Pages: 293-300
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.535-537.293
• Online since: June 2012
• Authors: Zhao Hui Ouyang, Lin Wu, De Lian Yi
• Keywords: Codoping Modification, Magnetic Mesoporous Microspheres, Magnetic Microspheres, Polystyrene-SiO₂/NiFe₂O₄

References

[1] Siepmann J, Faisant N, Akiki J, et a1. Effect of the size of biodegradable microparticles on drug release[J]. Journal of Controlled Release, 2004，96(1): 123-134.

DOI: 10.1016/j.jconrel.2004.01.011

[2] FRANZREB M, SIEMANN-HERZBERG M, HOBLEY T J, et al. Protein purification using magnetic adsorbent particles[J]. Applied Microbiology and Biotechnology, 2006,70(5):505-516.

DOI: 10.1007/s00253-006-0344-3

[3] ZHANG B，XING J，LIU H H. Preparation and application of magnetic microsphere carriers [J].Front Chem Eng China, 2007,1(1):96-101.

DOI: 10.1007/s11705-007-0019-3

[4] HONG R Y，FENG B，LIU G，et al. Preparation and characterization of Fe3O4/polystyrene composite particles via inverse emulsion polymerization [J]. Alloys and Compounds, 2009,476(1-2):612-618．

DOI: 10.1016/j.jallcom.2008.09.060

[5] Lijuan An, Zhaoqiang Li, Wei XU , et al. Preparation and Characterization of super paramagnetic Polystyrene microspheres[J].Chemical Journal of Chinese Universities, 2005，26(2)：366-369. In Chinese

[6] SANTRA S，TAPEC R，THEODOROPOULOU N，et a1. Synthesis and characterization of silica-coated iron oxide nanoparticles in microemulsion: the effect of nonionic surfactants [J].Langmuir, 2001, 17(10): 2900-2906.

DOI: 10.1021/la0008636

[7] Chao H, WEI X H, TANG J R, et al. Preparation, characterization and photocatalytic activities of boron- and cerium-codoped TiO2[J]. Journal of Environmental Sciences, 2007, 19(1):90-96.

DOI: 10.1016/s1001-0742(07)60015-1

[8] Junming WU， Yaping WANG，Han YANG，et al. Photocatalytic Properties and the Role of Ce in Co-Doped TiO2 with Ce and N[J]. Chinese Journal of Inorganic Chemistry, 2010, 26(2):203-210. In Chinese

[9] Liu Z L，Guo B，Hong L，et a1．Preparation and characterization of cerium oxide doped TiO2 nanoparticles[J]. Journal of Physics and Chemistry of Solids，2005，66(1): 161-167.

DOI: 10.1016/j.jpcs.2004.09.002

[10] Tong T Z，Zhang J L，Tian B Z，et a1. Preparation of Ce-TiO2 catalysts by controlled hydrolysis of titanium alkoxide based on esterification reaction and study on its photocatalytic activity[J]. Journal of Colloid and Interface Science，2007，315(1): 382-388.

DOI: 10.1016/j.jcis.2007.06.051

[11] Li F B，Li X Z，Hou M F，et a1．Enhanced photocatalytic activity of Ce3+–TiO2 for 2-mercaptobenzothiazole degradation in aqueous suspension for odour control[J]. Applied Catalysis A: General, 2005，285(1/2): 181-189.

DOI: 10.1016/j.apcata.2005.02.025

[12] Nana Chen，Yucheng Wu，Linyun Song，et al. Preparation and ph0t0catalysitc activity of Co—Ce eodoped nano TiO2 powder [J]. Sciencepaper Online, 2010, 5(4)336-340. In Chinese

[13] Shi Z M, Yan L．Phase transformation and crystal growth behaviors of La3+/Ce3+-doped TiO2-20wt％ SnO2 gels．Journal of Non-Crystalline Solids，2008，354(40-41)：4654-4660.

DOI: 10.1016/j.jnoncrysol.2008.05.039