Preparation of magnetic core/shell structured 纬-Fe₂O₃@Ti-tmSiO₂ and its application for the adsorption and degradation of dyes

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• 作者：Qiang Lv ; Gang Li ; Hongying Sun ; Linghao Kong ; Hong Lu ; Xiaoxia Gao
• 关键词：Core/shell ; Magnetic separation ; Mesoporous ; Fenton-like
• 刊名：Microporous and Mesoporous Materials
• 出版年：1 March, 2014
• 年：2014
• 卷：186
• 期：Complete
• 页码：7-13
• 全文大小：1583 K

文摘

A core/shell structured 纬-Fe₂O₃@Ti-tmSiO₂ nanocomposite with enhanced activity for the degradation of dyes that is capable of fast magnetic separation has been successfully prepared by a sol-gel process followed with calcination. The obtained core/shell structure is composed of a superparamagnetic core with a strong response to external fields, and an outer layer of porous titanium silicate with a tunable porous sizes. The convenient control over the pore size and the thickness of porous silica containing titanium species may make it possible to adsorb and catalyze molecules with different sizes. The presence of porous SiO₂ helps to enhance the chemical and thermal stability of 纬-Fe₂O₃ core. It is demonstrated that the core 纬-Fe₂O₃ as a Fenton-like catalyst exhibits good performance, while the Ti⁴⁺ existing in the porous shell also gives obvious activity in the degradation of dyes. The composite 纬-Fe₂O₃@Ti-tmSiO₂ possesses enhanced activity for the treatment of pollutants in water.