Core-shell structured 纬-Fe₂O₃@SiO₂@AgBr:Ag composite with high magnetic separation efficiency and excellent visible light activity for acid orange 7 degradation

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• 作者：Baozhu Tian ; Tingting Wang ; Rongfang Dong ; Shenyuan Bao ; Fan Yang ; Jinlong Zhang
• 关键词：Core&ndash ; shell structure ; Photocatalytic degradation ; AgBr ; Magnetic separation ; Acid orange 7
• 刊名：Applied Catalysis B: Environmental
• 出版年：5 April, 2014
• 年：2014
• 卷：147
• 期：Complete
• 页码：22-28
• 全文大小：2379 K

文摘

Core-shell structured 纬-Fe₂O₃@SiO₂@AgBr:Ag composite microspheres with narrow size distribution were synthesized by a versatile multistep route, including solvothermal method to fabricate magnetic core, modified St枚ber method to coat SiO₂ interlayer, electrostatic assembly to deposit AgBr shell, and light reduction to form Ag nanoparticles. Spherical core with a diameter of 250 nm consists of primary magnetic nanoparticles, making the composite photocatalyst show high saturation magnetization under the premise of keeping a certain superparamagnetic property. SiO₂ interlayer with a thickness of 鈭?5 nm is uniformly coated on the surface of magnetic core, favorable to enhancing the chemical stability of magnetic core as well as preventing the deterioration of photocatalytic activity. 纬-Fe₂O₃@SiO₂@AgBr:Ag composite exhibits excellent visible light photocatalytic activity for the degradation of acid orange (AO7) dye, due to the fact that both Ag nanoparticles and AgBr can response to visible light. Beneficial from the narrow size distribution as well as high saturation magnetization and superparamagnetic property, the core-shell structured photocatalyst shows high efficiency in magnetic separation and recovery. The optimal loading amount of AgBr for obtaining both uniform morphology and high activity is 鈭?2 wt.%.