无机层状纳米复合物的软化学法制备、结构及性能研究
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摘要
制造新型纳米及亚微米结构材料是当今材料领域的研究热点之一。由于软化学法可以在温和的反应条件下和缓慢的反应进程中以可控制的步骤进行化学反应制备材料,被认为是目前最有前途的制备方法之一。本文以具有较高光催化活性钙钛矿型层状镧钛酸盐为研究对象,将软化学法运用到其制备及改性的有关环节,制备以K_2Ln_2Ti_3O_(10)为基础的纳米复合材料,研究其结构、形态、层间反应即交换/嵌入反应、光催化性能等,主要内容如下:
     采用了两种软化学法——硬脂酸法及柠檬酸溶胶-凝胶法,在较低的温度下合成系列超细层状材料K_2Ln_2Ti_3O_(10)及K_2Ln_(2-x)Ln’_xTi_3O_(10)(Ln,Ln’=La,Pr,Nd,Sm,Eu,Gd,Dy),系统研究了Ln对K_2Ln_2Ti_3O_(10)晶体结构的影响,证明Ln~(3+)的离子半径是能否形成钙钛矿型层状结构的决定性因素。解析了K_2Ln_2Ti_3O_(10)(Ln=Pr,Nd,Sm,Eu,Gd,Dy)系列晶体的结构,得到了未见文献报道的Ln=Pr,Sm,Eu,Gd,Dy的晶胞参数及指标化结果。对形成K_2Ln_2Ti_3O_(10)的反应历程进行了探讨,发现了由中间产物KLn_2Ti_3O_(9.5)向目标产物转变的过程。探讨了用硬脂酸法合成KLn_2Ti_3O(9.5)系列产物,产物为20nm×20nm左右的方块状小晶体,具有较大的比表面积,是一类具有层状结构新化合物。对K_2Ln_2Ti_3O_(10)的光催化活性研究结果表明:软化学法的产物活性明显高于固相反应法产物:K_2Ln_2Ti_3O_(10)的催化活性按Dy>Gd>Nd>Sm>La顺序递减,通过对其能隙的分析解释了其活性顺序;Ln位的部分掺杂有利于提高产物的光催化活性。
     系统研究了K_2La_2Ti_3O_(10)的层间软化学反应——酸交换及烷基胺预撑反应,考察了原料的尺寸、酸种类等因素对酸交换及烷基胺嵌入反应的影响,并对酸交换的动力学及交换产物的拉曼活性进行了研究。发现了酸种类对酸交换反应速率、交换产物层间距及层板结构的影响规律,进而影响了烷基胺的嵌入过程;酸交换及烷基胺嵌入产物的层间距随颗粒尺寸的减小而增大;而硬脂酸法制备的超细K_2La_2Ti_3O_(10)在HNO_3交换介质中可完全剥离且剥离后的单片层自行卷曲成纳米棒,小尺寸的H_2La_2Ti_3O_(10)在正丙胺预撑过程中也出现了剥离现象。
     将软化学法引入层状化合物的改性过程,采用柱撑、担载、包覆工艺制备了系列以为K_2La_2Ti_3O_(10)基的纳米复合材料,并对其光催化性能进行了研究。结果表明:改性后产物的光催化活性均得到明显提高,其中柱撑法改性产物具有最高的催化活性。
     探索了K_2Ln_2Ti_3O_(10)及KLn_2Ti_3O_(9.5)系列材料在火炸药领域中的应用,发现二者对AP热分解均有一定的催化活性,而KLn_2Ti_3O_(9.5)的催化活性明显高于K_2Ln_2Ti_3O_(10);
Recently, synthesis and creation of novel nanometer and micro-sized materials are extensively studied in material field. Soft-chemistry method is considered as one of the most outlook method in fabricating new materials because of its unique reacting characteristics, such as mild reaction condition, lower reaction speed, controllable process. In this Ph. D. dissertation, soft-chemistry law was fully used in fabricating and modifying perovskite-type layered lanthanon titanates, including synthesis of ultrafine layered K_2Ln_2Ti_3O_(10) and nanocomposites based on it. The influence of the particle size on the crystal structure, micrograph and interlayer soft reaction properties, such as exchanging/intercalating reaction and photocatalytic activity was studied. The dissertation was mainly focused on:
    Two kinds of soft-chemistry method---stearic acid method (SAM) and citric acid sol-gel method were successfully adopted to fabricated ultrafine layered K_2Ln_2Ti_3O_(10) and K_2Ln_(2-x)Ln'_xTi_3O_(10) (Ln, Ln'=La, Pr, Nd, Sin, Eu, Gd, Dy) compounds under relatively lower temperature. The impact of Ln on the K_2Ln_2Ti_3O_(10) crystal structure was also systemic investigated. Results showed that the radius of Ln~(3+) determined whether the layered perovskite structure could be formed. The formation mechanism of K_2Ln_2Ti_3O_(10) was discussed. It was shown that the K_2Ln_2Ti_3O_(10) was changed from a mediate state— KLn_2Ti_3O_(9.5) for the first time. And the KLn_2Ti_3O_(9.5) series were newly synthesized by SAM. It was found that KLn_2Ti_3O_(9.5) is square-like and the average size is ca.20nm, has higher BET surface area and unique layered structure similar to the aim products. The obtained products are a new kind of perovskite-type layered compounds. The photocatalytic properties of K_2Ln_2Ti_3O_(10) and K_2Ln_(2-x)Ln'_xTi_3O_(10) were studied and results showed that the photoactivities of samples obtained by SAM are all better than those of SSR (solid state reaction), the photocatalytic activity of K_2Ln_2Ti_3O_(10) was strongly dependent on Ln, decreasing in the sequence of Dy> Gd>Nd>Sm >La by the same method and this sequence was successfully explained by analyzed the energy gap of each K_2Ln_2Ti_3O_(10). At the same time, the adulteration of Ln helps to improve its catalytic activity.
    The interlayer soft reaction process, such as acid-exchanging and alkylamine intercalating process of K_2La_2Ti_3O_(10) was systemic studied. The influence of particle sizes of K_2La_2Ti_3O_(10) and the kind of acid on the products of exchanged by H+, intercalated by
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