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首页> 外文期刊>New Journal of Chemistry >Synthesis and characterization of core-shell-shell magnetic (CoFe2O4-SiO2-TiO2) nanocomposites and TiO2 nanoparticles for the evaluation of photocatalytic activity under UV and visible irradiation
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Synthesis and characterization of core-shell-shell magnetic (CoFe2O4-SiO2-TiO2) nanocomposites and TiO2 nanoparticles for the evaluation of photocatalytic activity under UV and visible irradiation

机译：核-壳-壳磁性（CoFe2O4-SiO2-TiO2）纳米复合材料和TiO2纳米颗粒的合成与表征，用于评价紫外和可见光下的光催化活性

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摘要

Magnetic TiO2-SiO2-CoFe2O4 (TSC) composite photocatalytic particles with a core-shell structure and a high crystalline anatase TiO2 shell were synthesized via controlled hydrolysis and condensation of titanium isopropoxide. Nano-sized TiO2 powders were synthesized by a sol-gel/hydrothermal route. The prepared TiO2 and its composites were characterized by XRD, SEM, TEM, FT-IR, VSM, and UV-Vis. The results show that the obtained TSC composite particles were composed of spherical nanoparticles, about 5-8 nm in diameter, with several CoFe2O4 fine particles as cores and silica as coatings and barrier layers between the magnetic cores and anatase titania shells. The average crystallite size of TiO2 nanoparticles with an anatase structure is 6 nm. The photocatalytic activities of the samples were evaluated by the photocatalytic degradation of dichlorophenol-indophenol (DCPIP) dye. The maximum level reached for the degradation of the dye molecule was 95.32 and 87.27% for 3 minutes under UV and visible light respectively for mesoporous TiO2 nanoparticles.
机译：通过异丙醇钛的水解和缩合反应，合成了具有核壳结构和高结晶锐钛矿型TiO2壳的磁性TiO2-SiO2-CoFe2O4（TSC）复合光催化颗粒。通过溶胶-凝胶/水热法合成了纳米尺寸的TiO2粉末。用XRD，SEM，TEM，FT-IR，VSM和UV-Vis对制备的TiO2及其复合材料进行了表征。结果表明，所得TSC复合颗粒由直径约5-8 nm的球形纳米颗粒组成，CoFe 2 O 4细颗粒为核，二氧化硅为涂层，磁核与锐钛矿型二氧化钛壳之间为隔离层。具有锐钛矿结构的TiO2纳米颗粒的平均微晶尺寸为6 nm。通过二氯苯酚-吲哚酚（DCPIP）染料的光催化降解来评估样品的光催化活性。对于中孔TiO 2纳米颗粒，在紫外线和可见光下3分钟，染料分子降解的最高水平分别为95.32和87.27％。

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