| Mn-Fe氧体/SiO_2/TiO_2磁载光催化剂的制备及性能 |
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| 引用本文： | 展宗城,任学昌,陈学民,苏立彬,胡普查.Mn-Fe氧体/SiO_2/TiO_2磁载光催化剂的制备及性能[J].环境科学与技术,2009,32(4). |
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| 作者姓名： | 展宗城 任学昌 陈学民 苏立彬 胡普查 |
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| 作者单位： | 兰州交通大学环境与市政工程学院,甘肃,兰州,730070 |
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| 基金项目： | 甘肃省自然科学基金，兰州交通大学第四批'青兰'人才工程项目 |
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| 摘 要： | 以化学共沉淀法制备Mn-Fe氧体,正硅酸乙酯为前躯体对其进行多次包覆SiO2,得到致密SiO2保护层的Mn-Fe氧体软磁性载体。采用溶胶-凝胶法在软磁性载体上负载TiO2光催化剂,得到Mn-Fe氧体/SiO2/TiO2纳米磁载性复合光催化剂。用X射线衍射仪(XRD)、振动样品磁强计(VSM)进行了表征;以甲醛为模拟污染物,评价了其光催化活性;以磁性回收装置测定了其回收率。结果表明,对TiO2进行晶化热处理时,磁载体中金属离子在TiO2有所渗透,且随着TiO2负载次数的增多,金属离子在TiO2中的含量逐渐降低,TiO2粒径逐渐增大;复合催化剂的比饱和磁化强度减小,矫顽力增大,其磁回收效率逐渐降低,光催化活性逐渐增强。当TiO2负载次数为10次时,该磁载催化剂的催化活性是纯TiO2的1.053倍,回收率为70.52%。该光催化剂既具有较高的光催化活性又具有高的回收性能。
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| 关 键 词： | Mn-Fe氧体 磁性光催化剂 共沉淀法 磁性回收 光催化活性 |
Synthesis and Characterization of Manganese Ferrite/Silica/Titania Nanometer Magnetic Photocatalytic Compound |
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| ZHAN Zong-cheng,REN Xue-chang,CHEN Xue-min,SU Li-bin,HU Pu-cha.Synthesis and Characterization of Manganese Ferrite/Silica/Titania Nanometer Magnetic Photocatalytic Compound[J].Environmental Science and Technology,2009,32(4). |
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| Authors: | ZHAN Zong-cheng REN Xue-chang CHEN Xue-min SU Li-bin HU Pu-cha |
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| Institution: | School of Environment & Municipal Engineering;Lanzhou Jiaotong University;Lanzhou 730070;China |
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| Abstract: | Mn-ferrite powders have been prepared successfully by coprecipitation method,the products covered by a uniform silica shell using terraethoxysilane.The magnetic composie carrier-manganese-ferrite/silica were prepared,titania nanoparticles were directly coated on the silica coated manganese ferrite forming photoactive titania shell by sol-gel method.The prepared composite powders were characterized with ray diffraction(XRD),vibrate sample agnetometer(VSM).The photocatalytic activity of composite particles we... |
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| Keywords: | Mn-ferrite magnetic photocatalyst corprecipitation method magnetic recovery photocatalysis activity |
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