化学沉淀法制备锐钛型介孔纳米二氧化钛粉体的研究
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摘要
随着科学技术的进步,人们发现当材料的尺寸减小到超细时(﹤0.1μm ),材料的性质有了较大的变化,表现出一些新颖的特性,预示着新的应用前景。自从1992年美孚石油公司的科研人员首次研制出MCM-41介孔分子筛以来,有序介孔材料便因其优异的性能广阔的应用前景,引起了科研工作者的极大热情。二氧化钛介孔材料因其在光催化、传感器、太阳能电池、催化剂载体等方面具有种种潜在的用途而备受关注,已成为材料科学一个新的研究热点。对于该材料的合成研究当然是重中之重。
目前已有文献报道了几种该材料的制备方法,所得材料都具有高的比表面积、有序的孔结构、很窄的孔径分布,并可以实现在一定范围内孔径的调节,但几乎所有的方法都有一个共同的缺点:使用高成本的溶胶-凝胶法,即由钛的有机醇盐(如:钛酸丁酯)为原料,在模板剂的作用下采用无机酸为水解催化剂,有机溶剂为介质(如:无水乙醇等)先得到溶胶再转化为凝胶体,经干燥,焙烧制得。由于该方法生成本高(原料均为有机物),制备周期长(原料有机醇盐制备较复杂,同时必须有形成溶胶—凝胶过程),难以实现工业化扩大生产。
本文通过阅读大量文献,研究现状,主要做了以下几个方面的探索:
1.改进原有的沉淀法,通过加入少量的表面活性剂作模板剂,改善反应的微环境,控制颗粒的产生、生长、聚集、煅烧等各个步骤,来得到锐钛型介孔纳米二氧化钛粉体。通过正交试验来得到小试阶段的最佳工艺参数。除了少量的有机模板剂,整个反应以水为反应介质,无机物为原料,最大限度地降低成本,简化工艺,为后续的产业化目标打下基础。
In pace of development of science technology , people has discovered the material quality has great changes and manifested some specific properties when the material size reduces to nanometer(<0.1μm ).This discovery prodictes a wide-applied prospect. Since the MCM-41 molecular sieve has been prepared by the scientists of Mobil Oil successfully in 1992,ordered mesoporous materials are appealing more researcher’s attention due to their properties and numerous applications in many fields.Among them mesoporous titania is a very interesting material,in view of its usefulness in various novel devices such as photocatalysts,adsorbents,solar cells , chemical sensors. The synthesis of mesoporous titania has tremendous important on the application research.
At present ,several preparation methods are utilized yet.These products have a very high surface area,ordered pore structure and extremely narrow pore size distribution,the pore diameter can be adjusted and so on,but all of methods have the same defect: the sol-gel process. It is very difficult to come true industrialization because of the long -time synthsis process,the high cost of raw material,the complicated
目前已有文献报道了几种该材料的制备方法,所得材料都具有高的比表面积、有序的孔结构、很窄的孔径分布,并可以实现在一定范围内孔径的调节,但几乎所有的方法都有一个共同的缺点:使用高成本的溶胶-凝胶法,即由钛的有机醇盐(如:钛酸丁酯)为原料,在模板剂的作用下采用无机酸为水解催化剂,有机溶剂为介质(如:无水乙醇等)先得到溶胶再转化为凝胶体,经干燥,焙烧制得。由于该方法生成本高(原料均为有机物),制备周期长(原料有机醇盐制备较复杂,同时必须有形成溶胶—凝胶过程),难以实现工业化扩大生产。
本文通过阅读大量文献,研究现状,主要做了以下几个方面的探索:
1.改进原有的沉淀法,通过加入少量的表面活性剂作模板剂,改善反应的微环境,控制颗粒的产生、生长、聚集、煅烧等各个步骤,来得到锐钛型介孔纳米二氧化钛粉体。通过正交试验来得到小试阶段的最佳工艺参数。除了少量的有机模板剂,整个反应以水为反应介质,无机物为原料,最大限度地降低成本,简化工艺,为后续的产业化目标打下基础。
In pace of development of science technology , people has discovered the material quality has great changes and manifested some specific properties when the material size reduces to nanometer(<0.1μm ).This discovery prodictes a wide-applied prospect. Since the MCM-41 molecular sieve has been prepared by the scientists of Mobil Oil successfully in 1992,ordered mesoporous materials are appealing more researcher’s attention due to their properties and numerous applications in many fields.Among them mesoporous titania is a very interesting material,in view of its usefulness in various novel devices such as photocatalysts,adsorbents,solar cells , chemical sensors. The synthesis of mesoporous titania has tremendous important on the application research.
At present ,several preparation methods are utilized yet.These products have a very high surface area,ordered pore structure and extremely narrow pore size distribution,the pore diameter can be adjusted and so on,but all of methods have the same defect: the sol-gel process. It is very difficult to come true industrialization because of the long -time synthsis process,the high cost of raw material,the complicated
引文
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