控制胶体合成法制备掺铁（Ⅲ）二氧化钛光催化剂的研究
发布时间：2018-11-01 14:11
【摘要】： 本文致力于TiO_2粉末光催化剂的掺杂改性研究。分别采用控制胶体合成法和溶胶-凝胶法制备了两种不同掺铁方式的TiO_2粉末,并用XRD、TEM、TG-DSC、BET、UV-Vis、FS等技术对样品进行了表征。在紫外光照射下,以甲基橙溶液的光催化降解反应为探针,研究了掺Fe离子浓度、包覆的次数、不同掺杂方式对样品光催化活性的影响。研究表明: (1)掺杂离子的浓度对TiO_2晶相和颗粒粒径有很大影响。500℃煅烧时样品均为锐钛矿相;在适量掺杂浓度下,掺入金属离子能不同程度地抑制TiO_2晶粒的长大。本实验按方案A和方案B采取的非均匀掺杂样品的粒径相比相对应的均匀掺样品基本保持不变。 (2) BET结果显示,所制备样品均具有介孔结构,相比于均匀掺杂的TiO_2,按方案B采用控制胶体合成法制备的非均匀TiO_2,其比表面明显增大。但随着包覆次数的增多,比表面没有明显地变化。 (3)尽管掺杂方式有所不同,TiO_2粉末的光吸收带边随着掺杂离子浓度产生红移,并在可见光区吸收增强。另外,采取方案A和方案B,随包覆次数的增多,都可以看到一个向短波长方向微弱的蓝移现象。 (4) FS结果可以看出,图中均匀掺杂的TiO_2的荧光强度比纯TiO_2要低。另外,采取不同掺杂方式、掺杂浓度得到的掺铁TiO_2的荧光峰的位置基本一致,说明掺入的Fe3+并没有引起新的发光现象。 (5)采用均匀掺杂方式对TiO_2进行掺杂改性,产生具有的最佳掺杂浓度,但TiO_2催化性能的提升效果不明显,甚至会降低其催化活性。这是由于均匀掺杂时,金属离子捕获光生电子或空穴的同时又可能成为表面电子-空穴对的复合中心,从而降低TiO_2的催化活性。 (6)按方案A非均匀掺杂方式,当加水量为0.5 ml左右时(接近化学计量值0.455ml),包覆一次后,得到的TiO_2催化剂的光催化效果最好,其中以0.02%Fe-TiO_2样品作载体,包覆一次后得到的1-0.02%Fe-TiO_2/C-A具有最佳的光催化活性,其表观速率常数分别为对应的含有相同掺杂浓度的均匀掺杂的0.016%Fe-TiO_2的2.08倍,为纯的TiO_2的2.73倍。 (7)按方案B非均匀掺杂方式,当载体的掺杂浓度小于0.02%,n-FeTiC-B的催化活性不高。当载体的掺杂浓度高于0.02%,相比FeTiE和未掺杂的TiO_2,n-FeTiC-B光催化活性明显提高,并且随着包覆次数(≤3次)的增加而增大。以干凝胶粉末0.04%Fe-TiO_2-G作载体包覆3次后制备的样品具有最佳光催化活性,其表观速率常数是纯TiO_2粉末的5.32倍,是具有相同Fe含量的均匀掺杂TiO_2粉末0.023% Fe-TiO_2的4.58倍。
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【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：O643.36
本文编号：2304150
[Abstract]:% E6%9C%AC%E6%96%87%E8%87%B4%E5%8A%9B%E4%BA%8ETiO_2%E7%B2%89%E6%9C%AB%E5%85%89%E5%82%AC%E5%8C%96%E5%89%82%E7 % 9A8A8A8D82D822B 9A8A82A 822A you are right and right, including E98787E787, E6888E688, E98787, E7A9, E680A9, E687, E68886, E687, E688, and E6, including E987, E787, E688, and E6, the right side, right, right. A7%E5%88%B6%E8%83%B6%E4%BD%93%E5%90%88%E6%88%90%E6%B3%95%E5%92%8C%E6%BA%B6%E8%83%B6-%E5%87%9D%E8%83%B6%E6 % B3%95%E5%88%B6%E5%A4%87%E4%BA%86%E4%B8%A4%E7%A7%8D%E4%B8%8D%E5%90%8C%E6%8E%BA%E9%93%81%E6%96%B9%E5%BC%8F % E7%9A%84TiO_2%E7%B2%89%E6%9C%AB%2C%E5%B9%B6%E7%94%A8XRD%2CTEM%2CTG-DSC%2CBET%2CUV-Vis%2CFS%E7%AD%89%E6%8A%80%E6%9C%AF%E5%AF % B9E6E6A0A0A7, B9E6, E6A0, E8, E7, E6, E8, A8, E8, E E785, A785, A7, E8, 8, 8, 8, 8, and 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8? 8? 8? 8? 82A2A5E8DE8DE8D8DE8D8D8D8D8D8D8D8D8D8D8D8D8E8A8A5B8E98E98A5B98E98D8D8D8D8D8D8D8D8D8D8D8D8D8D8D8D8D8D8D8D8D8D8D8D8D8D8D8D8DE8D8D8D8D8D8D8D8D8D8D8D8D8D8D8D8 86E68E68E5Fe8A8E68E68E5Fe8E68E68E68E78A8A8A88E68A8A68A68A8A68A68A8A68A68A88E68A68A8A68A688E68A68A88E688E78A5A5AD90 to the side of the bank, including the side of E6E6B690B02C02CE4B8B8%. 8DE5908C5908C, including 82E5908C, 8DE5908C, 8DE5908C, 8D5E5908C, 8D5908C, 8D5E5908C5908C, 8D58E5908C9908C98C908C98C908C98C9088C9988C98E58E59E590888888E5888888E5888E5888E5888E58E588E58E58 B4%BB%E6%80%A7%E7%9A%84%E5%BD%B1%E5%93%8D.%E7%A0%94%E7%A9%B6%E8%A1%A8%E6%98%8E%3A%0D%0A%0D%0A%0D%0A%09%281 % 29%E6%8E%BA%E6%9D%82%E7%A6%BB%E5%AD%90%E7%9A%84%E6%B5%93%E5%BA%A6%E5%AF%B9TiO_2%E6%99%B6%E7%9B%B8%E5%92%8C % E9%A2%97%E7%B2%92%E5%BE%84%E6%9C%89%E5%BE%88%E5%A4%A7%E5%BD%B1%E5%93%8D.500%E2%84%83%E7%85%85%E7 % 83%A7%E6%97%B6%E6%A0%B7%E5%93%81%E5%9D%87%E4%B8%BA%E9%94%90%E9%92%9B%E7%9F%BF%E7%9B%B8%3B%E5%9C%A8%E9%80 % 82%E9%87%8F%E6%8E%BA%E6%9D%82%E6%B5%93%E5%BA%A6%E4%B8%8B%2C%E6%8E%BA%E5%85%A5%E9%87%91%E5%B1%9E%E7%A6%BB % E5%AD%90%E8%83%BD%E4%B8%8D%E5%90%8C%E7%A8%8B%E5%BA%A6%E5%9C%B0%E6%8A%91%E5%88%B6TiO_2%E6%99%B6%E7%B2%92%E7 % 9A84A84E9E7. A7.8C7. the head of the bank is 9A8A84E9E9A188A 8C68C9C9E9A188A 8C5CAC8C9E9A188A 8C5CAC8C9E5A4A4A7, including E696B9E696A1%, including 9CACE5E5E5E5E5E5E5E6A988A, including the following aspects: 1%, including: 9CAC8E696A1%, including 1% of E696A1%. 88BE98F79A8E79A, including E799A, and E799A, including E799A84E784 E7%, E7999A84E7%, E799A84E7%, E79991, E79A84E7%, E799A84E7%. B292E8E8E8E8B 8B 8B 8B 8E 8B 8B 8B 8E 8B 8B 8B 8E 8B 8B 8B 8e 8e 8B 8B 8e 8e 8B 8B 8B 8e 8B 8B 8B, I have the right side of the head, right, right. E5%93%81%E5%9F%BA%E6%9C%AC%E4%BF%9D%E6%8C%81%E4%B8%8D%E5%8F%98.%0D%0A%0D%0A%0D%0A%09%282%29%20BET%E7%BB%93%E6 % 9E%9C%E6%98%BE%E7%A4%BA%2C%E6%89%80%E5%88%B6%E5%A4%87%E6%A0%B7%E5%93%81%E5%9D%87%E5%85%B7%E6%9C%89%E4%BB % 8B%E5%AD%94%E7%BB%93%E6%9E%84%2C%E7%9B%B8%E6%AF%94%E4%BA%8E%E5%9D%87%E5%8C%80%E6%8E%BA%E6%9D%82%E7%9A%84TiO _ 2%2C%E6%8C%89%E6%96%B9%E6%A1%88B%E9%87%87%E7%94%A8%E6%8E%A7%E5%88%B6%E8%83%B6%E4%BD%93%E5%90%88%E6%88%90 % E6%B3%95%E5%88%B6%E5%A4%87%E7%9A%84%E9%9D%9E%E5%9D%87%E5%8C%80TiO_2%2C%E5%85%B6%E6%AF%94%E8%A1%A8%E9%9D%A2 % E6988E6988E6988E6988E688E5E6A298E88E777D7D8E88E8E68E68E68E68E68E6E68E68E68E68E68E68E68E68E8E68E68E68E58E68E68E68E8E58E68E6E6E6A298E688E6E6E6A29888E68E78E 9A84E5A4A9A, including the side of 8D8E5A1E68A1E68A1E68A1E68A1E68A1E68E5A4A4A4A4A8A88A98A98A988A9A8A8A9A88A9A8A8A8A9A4A4A4A4A4A8A8A4A8A4A4A4A8A4A8A4A4A8A4A4A8A4A4A4A8A4A4A4A4A4A 98%E5%8C%96.%0D%0A%0D%0A%0D%0A%09%283%29%E5%B0%BD%E7%AE%A1%E6%8E%BA%E6%9D%82%E6%96%B9%E5%BC%8F%E6%9C%89%E6 % 89%80%E4%B8%8D%E5%90%8C%2CTiO_2%E7%B2%89%E6%9C%AB%E7%9A%84%E5%85%89%E5%90%B8%E6%94%B6%E5%B8%A6%E8%BE%B9%E9 % 9A%8F%E7%9D%80%E6%8E%BA%E6%9D%82%E7%A6%BB%E5%AD%90%E6%B5%93%E5%BA%A6%E4%BA%A7%E7%94%9F%E7%BA%A2%E7%A7%BB % 2CE5B9B9B8A8A8A8A8A8B8A8B8B8B8A88C8B88B59B59B9B9B9B9B58B8B8B8B8B8B8B8B8B8B8B8B8A58B8B8B8B8B8B8B8B8B8B8B8B8A58B8B8B8B8B8B8B8B8C8B8B8B8B8B8B8B8B8B8B8B8B8B8A5 E5A48F2, E5A4962F2, E5A48F2, E58F8, E58C85, E8A6A686%, including E998C6A188B2C92C8CE6A188B2C92C98C6A9A188B2C, including E9996B987, including E696B987, and E58F58C85E85E8A686%, including the right side, right, right. E6ACA1, E0E7A7A7A74, including E5A0E588B880E4%, including E5ACA58F4FAFE93BDE5C4FAFE983BDE5C4F9C93B5A5C4F7C9C9C9A9A5C5C5C5C78E88E880E880E4%, right, right. B8AAE5901, B8AAE590B991, B8AAE596B9B1, E5909E596B9B1, E5FE596B9B1, including B3A790, E99F83FI, and E73D7A7BBB%, right, right. E7%8E%B0%E8%B1%A1.%0D%0A%0D%0A%0D%0A%09%284%29%20FS%E7%BB%93%E6%9E%9C%E5%8F%AF%E4%BB%A5%E7%9C%8B%E5%87%BA%2C % E5%9B%BE%E4%B8%AD%E5%9D%87%E5%8C%80%E6%8E%BA%E6%9D%82%E7%9A%84TiO_2%E7%9A%84%E8%8D%A7%E5%85%89%E5%BC%BA%E5 % BA%A6%E6%AF%94%E7%BA%AFTiO_2%E8%A6%81%E4%BD%8E.%E5%8F%A6%E5%A4%96%2C%E9%87%87%E5%8F%96%E4%B8%8D%E5%90%8C% E68E8E8E8E62E62E96B982, including E68F8F82E6B593E6BAA6, including E5BC88C62E6B53E6BAA6, including E5BC8C62E62E68B6B6, including E5BC88C628B96B988 B0E79A84A84E6%, including the right side, right, right. 8EBAE9E92TiOII 2E79A2, including the following: 8%, including the following aspects: 882%, including 881, 8D, 8D, 8D, 8D, 82TiOII, 81tio, 2E79A, and 81TiOII, including the side of the plane, including the following aspects: 8%, including the following: 8%, including the side of the center, including the following: "E88D" and "81TiOII", including the following aspects: 8percent, right, right. 80E887B4C2C887B4E62C8887B88B62C8C888B68C88B88B6B6C688E888B6B2C68E887 E888B6B2C68E887B6B2E7888B6B2E8888B2C68E88B68B68C88B8B8B78E88E68B688B68B68B68B68B68B68B68B8B8B6 B7%E6%96%B0%E7%9A%84%E5%8F%91%E5%85%89%E7%8E%B0%E8%B1%A1.%0D%0A%0D%0A%0D%0A%09%285%29%E9%87%87%E7%94%A8%E5 % 9D%87%E5%8C%80%E6%8E%BA%E6%9D%82%E6%96%B9%E5%BC%8F%E5%AF%B9TiO_2%E8%BF%9B%E8%A1%8C%E6%8E%BA%E6%9D%82%E6%94 % B9%E6%80%A7%2C%E4%BA%A7%E7%94%9F%E5%85%B7%E6%9C%89%E7%9A%84%E6%9C%80%E4%BD%B3%E6%8E%BA%E6%9D%82%E6%B5%93 % E5%BA%A6%2C%E4%BD%86TiO_2%E5%82%AC%E5%8C%96%E6%80%A7%E8%83%BD%E7%9A%84%E6%8F%90%E5%8D%87%E6%95%88%E6%9E%9C % E4%B8%8D%E6%98%8E%E6%98%BE%2C%E7%94%9A%E8%87%B3%E4%BC%9A%E9%99%8D%E4%BD%8E%E5%85%B6%E5%82%AC%E5%8C%96%E6 B44E680E680BF99E67.I have the right side of the side. 8791E5B5B _ 5i _ _ _ E7A9, B9, B4, E9908, including E697A9, E990, and E990, including E8E883, BDE68, BDE688, 8F8, 8F890, E697A88F8F890, E697A88F88F8B8B790, including E697A88F8F8F88F8B8B4B8B790, including E697A88F8F8F88F88F88F88F88F88F88 B5%E5%AD%90-%E7%A9%BA%E7%A9%B4%E5%AF%B9%E7%9A%84%E5%A4%8D%E5%90%88%E4%B8%AD%E5%BF%83%2C%E4%BB%8E%E8%80%8C % E9998D9998D8DTiOII, 2E7um, including 28629E68C89%, right, 82ACE580A7.0D0C96D0A6B4B4C0D0D98B4B4D5000A0, 82ACE580A0D0D0D4B4B4B4D5B0D0D8E7o+, including 28629E68C89%. E696B9E9D9D9D5D9D5D9D9D9D9D5D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D5D9D9D9D9D9D9D9D58E58E58E58E58E58E58E B0B4E987, 0. 5 FB, 0. 5, 0. 5, 0. 5, 0. 5, 0. 5, 0. 5, 0. 5, 0. 5, 0. 5, 0. 5, 0. 5, 0. 0. 0. 0. 0. 0. 0. 0. 0. B, D, B, B. E9878F8F8F8F0455292F88F292F88F88F88F88F88F88F88F88F88F88F88F88F88F0A529292F88F88F292F88F8F88F8F8F88F88F8F88F8F0A5292F88F29292F88F88F8F88F2F292F88F88F2F292F88F292F88F8 E582, 82ACE582, E582ACE589, E582AC889, E5858988, E588589E689, E58889, E5889, E589888, E5889, E5889, 85B6E4B8, including A50.02, A50.02 and A686E4%, including the side of the side, including the side of A686E4, which is the center of the unit. The B880E6ACA5908E5908E5908E580E580E5908E580E5908E580E5908E580E5908E580E5908E5908E580E5908E580E5908E5908E580E5908E580E5908E580E5908E5908E5908E5908E580E5908E5908E5908E580E5908E5908E5908 B3E79A82B, including E7882, E782, E882, and E782, E682, E6A8808, E782, and B782, and E782, E9809, F782, E9809, and E78E87 percent, right, right. E5B8B8B8B8E680B8B8B8B8B8B8E68B88E68B8B88E68B88E68B88E688B88E68B88B8B88E68B88B88B88E68B88B88E68B88B8B88E68B8B8B8B88E688E68B8B88B88E68B8B88E68B88B88E6 8CE6E68E68E62E62E62E68E68E68E68E68E68E68E68E68E68E68E68E68E68E68E688E68E68E68E68E68E68E68E68E68E68E688E68E68E68E68E68E68E68E68E68E68E68E68E68E68E68E68E68 E7%9A%842.08%E5%80%8D%2C%E4%B8%BA%E7%BA%AF%E7%9A%84TiO_2%E7%9A%842.73%E5%80%8D.%0D%0A%0D%0A%0D%0A%09%287%29%E6 % 8C%89%E6%96%B9%E6%A1%88B%E9%9D%9E%E5%9D%87%E5%8C%80%E6%8E%BA%E6%9D%82%E6%96%B9%E5%BC%8F%2C%E5%BD%93%E8%BD % BD%E4%BD%93%E7%9A%84%E6%8E%BA%E6%9D%82%E6%B5%93%E5%BA%A6%E5%B0%8F%E4%BA%8E0.02%25%2Cn-FeTiC-B%E7%9A%84%E5%82 % AC%E5%8C%96%E6%B4%BB%E6%80%A7%E4%B8%8D%E9%AB%98.%E5%BD%93%E8%BD%E4%BD%93%E7%9A%84%E6%8E%BA%E6%9D%82% E6B53B93A93B5B53B53B5B53B53B8A98E9AB98m, including E6B58E0.02C72C5B, including E4BAA8A0.02C72C79C5B, including E4BAA8E82E79A%, including E6BAE6E68D82E79A9A%. 84TiO22-2Cn-FeTiC-B889 C: 8TiO22Cn-FeTiC-88-8Cn-FeTiC-88-8C2-8Cn-FeTiC-88-8C2Cn-FeTiC-88-8C2-8Cn-FeTiC-88-8Cn-FeTiC-88-8C2Cn-FeTiC-88-8CC-8Cn-FeTiC-88-8Cn-FeTiC-88-8CN-8Cn-FeTiC-88-8Cn-Fe B6E4E4E894, B4E894, E794, E774, and E774, right, you know, you know, 9E%E5%8A%A0%E8%80%8C%E5%A2%9E%E5%A4%A7.%E4%BB%A5%E5%B9%B2%E5%87%9D%E8%83%B6%E7%B2%89%E6%9C%AB0.04%FE-TiO_2 -G%E4%BD%9C%E8%BD%E4%BD%93%E5%8C%85%E8%A6%863%E6%AC%A1%E5%90%8E%E5%88%B6%E5%A4%87%E7%9A%84%E6%A0%B7%E5 % 93%81%E5%85%B7%E6%9C%89%E6%9C%80%E4%BD%B3%E5%85%89%E5%82%AC%E5%8C%96%E6%B4%BB%E6%80%A7%2C%E5%85%B6%E8%A1 % A8%E8%A7%82%E9%80%9F%E7%8E%87%E5%B8%E6%95%B0%E6%98%AF%E7%BA%AFTiO_2%E7%B2%89%E6%9C%AB%E7%9A%845.32%E5%80 % 8D%2C%E6%98%AF%E5%85%B7%E6%9C%89%E7%9B%B8%E5%90%8CFe%E5%90%AB%E9%87%8F%E7%9A%84%E5%9D%87%E5%8C%80%E6%8E%BA % E69D, including 82TiO2S, and the center of your arms, you are right, you know, you
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：O643.36
【参考文献】
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