A novel magnetic nanocomposite involving anatase titania coating on silica-modified cobalt ferrite via lower temperature hydrolysis of a water-soluble titania precursor

A novel magnetic nanocomposite involving anatase titania coating on silica-modified cobalt ferrite via lower temperature hydrolysis of a water-soluble titania precursor
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一种新型磁性纳米复合材料,通过水溶性二氧化钛前体的低温水解,在二氧化硅改性钴铁氧体上涂覆锐钛矿二氧化钛

DOI:
10.1016/j.materresbull.2009.06.003
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发表时间:
2009-10
影响因子:
5.4
通讯作者:
Lu, Zhongli
Lu, Zhongli
中科院分区:
材料科学2区
文献类型:
--
作者:
Duan, Xue;Zhang, Hui;Hou, Rong;Lu, Zhongli

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以水溶性钛二铵为原料,在较低温度(<97°C)下通过控制水解缩合反应制备了高比表面积的磁性纳米复合TiO 2/SiO2/CoFeO 3光催化剂,并用XRD、FTIR、HRTEM、BET、XPS和磁性分析等手段对其进行了表征。结果表明,所制备的光催化剂具有核/壳结构,其中铁氧体颗粒通过异相成核和生长机制依次包覆有连贯的二氧化硅层和纳米晶。光催化剂对甲基橙子的光降解率与Degussa P25相当,高于加热样品,初步归因于适当的微观结构和二氧化硅中间相以及表面键合羟基的隔离/固定功能。
A high surface area magnetic nanocomposite titania/silica/cobalt ferrite photocatalyst was synthesized via controlled hydrolysis and condensation of water-soluble titanium bis-ammonium lactato dihydroxide at relatively lower temperature (<97°C) and characterized by XRD, FTIR, HRTEM, BET, XPS and magnetism analysis. The results reveal that as-prepared photocatalyst possesses a core/shell structure involving ferrite particles sequentially coated with coherent silica layer and anatase nanocrystallites via a heterogeneous nucleation and growth mechanism. The photodegradation of the photocatalyst for methyl orange is comparative to Degussa P25 and higher than the heated samples, being tentatively attributed to the proper microstructure and isolation/immobilization functions by silica intermediate phase as well as the surface-bond hydroxyl groups.
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