文档介绍：
磁性光催化剂 Fe3O4/SiO2/TiO2 的蒸汽相
水解法制备及光催化性能#
郭冬雪,吴一泓,宗海伦,张青红**
5
10
15
20
25
30
35
(东华大学材料科学与工程学院,上海 201620)
摘要:采用蒸汽相水解法,以 Fe3O4 纳米磁性颗粒为磁核,在其表面包覆一层二氧化硅来阻
止光腐蚀,然后将锐钛矿相纳米氧化钛沉积在 Fe3O4/SiO2 颗粒表面,从而制得核壳结构的
Fe3O4/SiO2/TiO2 磁性复合光催化材料。用 X 射线粉末衍射(XRD)仪,场发射扫描电镜(FE-SEM),
高分辨率透射电子显微镜(HR-TEM),探针式震动磁强计等手段对所制备的产物的结构、形貌、
磁强度性能进行表征。以 300W 汞灯为光源亚甲基蓝和酸性红为模拟污水中有机染料评价复
合光催化剂的性能。结果表明磁性纳米微球中 TiO2 的含量越大其光催化性能越好,含 TiO2
50wt%的 F3O4/SiO2/TiO2 磁性纳米微球可在 180 分钟内降解亚甲基蓝模拟染料废水,降解率达
99%,在 80 分钟内降解酸性模拟染料废水,降解率达 98%。
关键词:蒸汽相水解;Fe3O4/SiO2/TiO2 磁性纳米微球;光催化
中图分类号:O436
Preparation of ic photocatalyst Fe3O4/SiO2/TiO2
and vapor-phase hydrolysis photocatalytic properties
GUO Dongxue, WU Yihong, ZONG Hailun, ZHANG Qinghong
(College of Materials Science and Engineering, Donghua University, Shanghai 201620)
Abstract: Anatase TiO2 nanoparticles were deposited on posite Fe3O4/SiO2, where Fe3O4
acted as the ic core and SiO2 acted as the protective coating against the photo corrosion of Fe3O4.
Thus, the multi-posite of Fe3O4/SiO2/TiO2 were obtained. X-ray powder diffraction (XRD),
field emission scanning electron microscope (FE-SEM), high resolution transmission electron
microscopy (HR-TEM), vibrating ometer probe by means of the prepared product structure,
morphology, ic characterization. With 300W mercury lamp as a light source, both methylene
blue and acid red were used to anic wastewater, posite catalytic properties of
visible light photocatalyst were evaluated. The results show that the greater the ic nanoparticles
in TiO2 content, the better the photocatalytic properties, Fe3O4/SiO2/TiO2 ic nanospheres
containing TiO2 50 wt% degraded of 99% of methylene blue dye in wastewater for 180 minutes while it
degraded 98% of acid red G in the simulated wastewater under irradiation for 80 minutes.
Key words: Vapor-phase hydrolysis;Fe3O4/SiO2/TiO2 ic nanospheres;Photocatalytic
0 引言
水资源污染是目前世界各国普遍面临而亟待解决的问题之一[1]。许多有毒有害的有机污
染物被水体和土壤自净化的速度很慢而净化不彻底,并且在水体中存在时间长、范围广对环
境造成严重的影响[2]。近年来的工作表