酸化焙烧高岭土负载铜、镍掺杂二氧化钛的制备及可见光催化性能研究

发布时间：2018-06-28 16:15

  本文选题：可见光光催化 + 原位制备　； 参考：《内蒙古工业大学》2015年硕士论文

【摘要】：Ti O2作为一种化学性质稳定、无毒、廉价的半导体氧化物,以其在紫外光下良好的光催化活性得到广泛关注,然而由于其自身缺陷(宽禁带、易流失、分离回收难),Ti O2极难实际应用于有机污染废水的处理。为了提高Ti O2在工业废水处理领域中的利用率,通常采用负载与掺杂等方法对Ti O2进行改性。本文以钛酸丁酯、硝酸铜、硝酸镍、高岭土等为原料,原位制备了X-Ti O2/SO42-/CK(X=Cu、Ni)催化剂,以罗丹明B为模拟污染物评价其在可见光下的光催化活性,重点考察了制备过程中掺杂量、浸渍酸浓度、焙烧温度对其光催化活性的影响,实验结果证明,本文制备的催化剂在可见光下具有良好的光催化活性,催化剂X-Ti O2/SO42-/CK(X=Cu、Ni)的掺杂量为1wt%Cu或0.75at%Ni,酸处理载体浓度为20%,催化剂焙烧温度为450℃,此时催化剂光催化效果最佳。利用XRD、BET、EDS、TEM、FTIR、UV-Vis、XPS等表征手段对所制备的X-Ti O2/SO42-/CK(X=Cu、Ni)催化剂结构和颗粒特性等进行了表征和分析。XRD测试结果表明催化剂X-Ti O2/SO42-/CK(X=Cu、Ni)中同时存在锐钛矿型Ti O2与金红石型Ti O2;BET结果分析结果显示负载后载体的比表面积有所增加;HTEM及EDS测试结果表明催化剂表面存在Cu和Ti O2,且Ti O2的晶格间距发生变化;XPS结果表明Ti、O的结合能降低,可能是由于掺杂物使Ti O2晶格间距发生变化导致的;Py-FTIR证明了该催化剂既含有B酸又含有L酸。
[Abstract]:As a stable, non-toxic and cheap semiconductor oxide, TIO _ 2 has attracted wide attention due to its excellent photocatalytic activity under ultraviolet light. However, due to its own defects (wide band gap, easy loss), TIO _ 2 is easy to be lost because of its excellent photocatalytic activity under ultraviolet light. It is very difficult to apply TIO _ 2 to the treatment of organic pollution wastewater. In order to improve the utilization of TIO _ 2 in industrial wastewater treatment, TIO _ 2 was modified by loading and doping methods. Using butyl titanate, copper nitrate, nickel nitrate and kaolin as raw materials, X-TiO _ 2 / so _ 4 _ 2-r _ (CK) catalyst was prepared in situ. Rhodamine B was used as a simulated pollutant to evaluate its photocatalytic activity under visible light. The effect of impregnation acid concentration and calcination temperature on the photocatalytic activity of the catalyst was studied. The experimental results show that the catalyst prepared in this paper has good photocatalytic activity under visible light. The doping amount of X-TiO _ 2 / so _ 42-P _ (CK) is 1 wk Cu or 0.75 at Ni, the concentration of acid treatment support is 20 and the calcination temperature is 450 鈩，

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