Abstract
To prevent and avoid magnetic loss caused by magnetite core phase transition involving in high-temperature crystallization of amorphous sol–gel TiO2, core–shell Fe3O4@SiO2@TiO2 composite spheres were synthesized via non-thermal process of TiO2. First, core–shell Fe3O4@SiO2 particles were synthesized through a solvothermal method followed by a sol–gel process. Second, anatase TiO2 nanoparticles (NPs) were directly coated on Fe3O4@SiO2 surface by liquid-phase deposition method, which uses (NH4)2TiF6 as Ti source for TiO2 and H3BO3 as scavenger for F− ions at 50 °C. The morphology, structure, composition, and magnetism of the resulting composites were characterized and their photocatalytic activities were also evaluated. The results demonstrate that TiO2 NPs with an average size of 6–8 nm were uniformly deposited on the Fe3O4@SiO2 surface. Magnetic hysteresis curves indicate that the composite spheres exhibit superparamagnetic characteristics with a magnetic saturation of 32.5 emu/g at room temperature. The magnetic TiO2 composites show high photocatalytic performance and can be recycled five times by magnetic separation without major loss of activity, which meant that they can be used as efficient and conveniently renewable photocatalyst.
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References
Álvarez PM, Jaramillo J, López-Piñero F, Plucinski PK (2010) Preparation and characterization of magnetic TiO2 nanoparticles and their utilization for the degradation of emerging pollutants in water. Appl Catal B 100:338–345
Benmami M, Chhor K, Kanaev AV (2005) Supported nanometric titanium oxide sols as a new efficient photocatalyst. J Phys Chem B 109:19766–19771
Beydoun D, Amal R (2002) Implications of heat treatment on the properties of a magnetic iron oxide-titanium dioxide photocatalyst. Mater Sci Eng B 94:71–81
Beydoun D, Amal R, Low G, McEvoy S (2002) Occurrence and prevention of photodissolution at the phase junction of magnetite and titanium dioxide. J Mol Catal A 180:193–200
Chen XB, Mao SS (2007) Titanium dioxide nanomaterials: synthesis, properties, modifications, and applications. Chem Rev 107:2891–2959
Dahl M, Liu YD, Yin YD (2014) Composite titanium dioxide nanomaterials. Chem Rev 114:9853–9889
Demirors AF, van Blaaderen A, Imhof A (2010) A general method to coat colloidal particles with titania. Langmuir 26:9297–9303
Fotiou T, Triantis TM, Kaloudis T, Hiskia A (2015) Evaluation of the photocatalytic activity of TiO2 based catalysts for the degradation and mineralization of cyanobacterial toxins and water off-odor compounds under UV-A, solar and visible light. Chem Eng J 261:17–26
Gao YA, Chen BH, Li HL, Ma YX (2003a) Preparation and characterization of a magnetically separated photocatalyst and its catalytic properties. Mater Chem Phys 80:348–355
Gao Y, Masuda Y, Koumoto K (2003b) Microstructure-controlled deposition of SrTiO3 thin film on self-assembled monolayers in an aqueous solution of (NH4)2TiF6-Sr(NO3)2-H3BO3. Chem Mater 15:2399–2410
Gao JN, Ran XZ, Shi CM, Cheng HM, Cheng TM, Su YP (2013) One-step solvothermal synthesis of highly water-soluble, negatively charged superparamagnetic Fe3O4 colloidal nanocrystal clusters. Nanoscale 5:7026–7033
Jaroenworaluck A, Regonini D, Bowen CR, Stevens R, Allsopp D (2007) Macro, micro and nanostructure of TiO2 anodised films prepared in a fluorine-containing electrolyte. J Mater Sci 42:6729–6734
Kabra K, Chaudhary R, Sawhney RL (2004) Treatment of hazardous organic and inorganic compounds through aqueous-phase photocatalysis: a review. Ind Eng Chem Res 43:7683–7696
Leshuk T, Linley S, Baxter G, Gu F (2012) Mesoporous hollow sphere titanium dioxide photocatalysts through hydrothermal silica etching. ACS Appl Mater Interfaces 4:6062–6070
Li G, Bai RB, Zhao XS (2008) Coating of TiO2 thin films on the surface of SiO2 microspheres: toward industrial photocatalysis. Ind Eng Chem Res 47:8228–8232
Li W, Yang JP, Wu ZX, Wang JX, Li B, Feng SS, Deng YH, Zhang F, Zhao DY (2012) A versatile kinetics-controlled coating method to construct uniform porous TiO2 shells for multifunctional core–shell structures. J Am Chem Soc 134:11864–11867
Liu J, Sun ZK, Deng YH, Zou Y, Li CY, Guo XH, Xiong LQ, Gao Y, Li FY, Zhao DY (2009) Highly water-dispersible biocompatible magnetite particles with low cytotoxicity stabilized by citrate groups. Angew Chem Int Ed 48:5875–5879
Liu HF, Jia ZG, Ji SF, Zheng YY, Li M, Yang H (2011) Synthesis of TiO2/SiO2@Fe3O4 magnetic microspheres and their properties of photocatalytic degradation dyestuff. Catal Today 175:293–298
Luo B, Song XJ, Zhang F, Xia A, Yang WL, Hu JH, Wang CC (2010) Multi-functional thermosensitive composite microspheres with high magnetic susceptibility based on magnetite colloidal nanoparticle clusters. Langmuir 26:1674–1679
Ma WF, Zhang Y, Li LL, You LJ, Zhang P, Zhang YT, Li JM, Yu M, Guo J, Lu HJ, Wang CC (2012) Tailor-made magnetic Fe3O4@mTiO2 microspheres with a tunable mesoporous anatase shell for highly selective and effective enrichment of phosphopeptides. ACS Nano 6:3179–3188
Maki H, Okumura Y, Ikuta H, Mizuhata M (2014) Ionic equilibria for synthesis of TiO2 thin films by the liquid-phase deposition. J Phys Chem C 118:11964–11974
Matsumoto A (2001) Polymerization of multiallyl monomers. Prog Polym Sci 26:189–257
Stöber W, Fink A, Bohn E (1968) Controlled growth of monodisperse silica spheres in the micron size range. J Colloid Interface Sci 26:62–69
Strohm H, Lobmann P (2005) Liquid-phase deposition of TiO2 on polystyrene latex particles functionalized by the adsorption of polyelectrolytes. Chem Mater 17:6772–6780
Teng ZG, Su XD, Chen GT, Tian CC, Li H (2012) Superparamagnetic high-magnetization composite microspheres with Fe3O4@SiO2 core and highly crystallized mesoporous TiO2 shell. Colloid Surf A 402:60–65
Van BA, Van GJ, Vrij A (1992) Monodisperse colloidal silica spheres from tetraalkoxysilanes: particle formation and growth mechanism. J Colloid Interface Sci 154:481–501
Wang P, Chen D, Tang FQ (2006) Preparation of titania-coated polystyrene particles in mixed solvents by ammonia catalysis. Langmuir 22:4832–4835
Xin TJ, Ma ML, Zhang HP, Gu JW, Wang SJ, Liu MJ, Zhang QY (2014) A facile approach for the synthesis of magnetic separable Fe3O4@TiO2 core–shell nanocomposites as highly recyclable photocatalysts. Appl Surf Sci 288:51–59
Ye MM, Zhang Q, Hu YX, Ge JP, Lu ZD, He L, Chen ZL, Yin YD (2010) Magnetically recoverable core-shell nanocomposites with enhanced photocatalytic activity. Chem Eur J 16:6243–6250
Yu XX, Liu SW, Yu JG (2011) Superparamagnetic γ-Fe2O3@SiO2@TiO2 composite microspheres with superiorphotocatalytic properties. Appl Catal B 104:12–20
Yuan RS, Zheng JT, Guan RB, Zhao YC (2005) Surface characteristics and photocatalytic activity of TiO2 loaded on activated carbon fibers. Colloid Surf A 254:131–136
Zhang YY, Guo SB, Ma JQ, Ge HG (2014) Preparation, characterization, catalytic performance and antibacterial activity of Ag photodeposited on monodisperse ZnO submicron spheres. J Sol-Gel Sci Technol 72:171–178
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This work was supported by the National Natural Science Foundation of China (Nos. 21373132).
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Ma, JQ., Guo, SB., Guo, XH. et al. Liquid-phase deposition of TiO2 nanoparticles on core–shell Fe3O4@SiO2 spheres: preparation, characterization, and photocatalytic activity. J Nanopart Res 17, 307 (2015). https://doi.org/10.1007/s11051-015-3107-1
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DOI: https://doi.org/10.1007/s11051-015-3107-1