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TiOCl2溶液微波加热制备金红石型TiO2纳米粒子 总被引:1,自引:0,他引:1
本文报道了一种由TiOCl2液相直接合成金红石型TiOz纳米粒子的新方法,即微波诱导沸腾回流强迫水解法,用该法制备出常规条件下不能得到的产品。所得产物用粉末X射线衍射仪和透射电子显微镜表征,证明产物为金红石型,粒子尺寸5~30nm可控。研究表明,产物物相取决于Ti^4 的初始水解速率,水解速率越快,越有利于金红石相成核;通过控制初始Ti^4 的浓度,可改变纳米TiO2的粒径。另外还讨论了该金红石型TiO2纳米粒子的成核机理。 相似文献
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以Ferrihydrite(又称水合氧化铁hydrous iron oxide)为反应前驱物, Fe(II)为催化剂, 在微量Na2SiO3存在下, 控制pH=6~9范围内合成出了亚微米级纺锤形和准立方形α-Fe2O3微粒. 研究了初始pH, Na2SiO3浓度, Ferrihydrite老化方式对相转化时间和产物形貌的影响, 利用XRD, SEM等手段对产物进行了表征. 结果表明, Na2SiO3对Ferriihydrite催化相转化有一定的抑制作用, 是影响其相转化过程及产物形貌的关键. 在弱碱性条件下, [Si]/[Fe3+]为0.01时可直接获得纺锤形(轴比≥2)或准立方形(300~400 nm) α-Fe2O3粒子, 并对形成机理进行了初步讨论. 相似文献
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低温下 Fe(Ⅱ)对Ferrihydrite相转化的催化作用研究 总被引:3,自引:0,他引:3
研究了在低温、近中性条件下,在微量Fe(Ⅱ)离子存在下Ferrihydrite(又称为水合氧化铁hydrous iron oxide)的相转化过程.结果表明,微量Fe(Ⅱ)离子的存在不仅可以加速Ferrihydrite的相转化过程,而且其相转化产物的组成也与没有Fe(Ⅱ)离子存在时产物的组成有所不同,即除了α—FeOOH和α—Fe2O3外,还形成了γ-FeOOH;相转化过程既与阴离子的种类、反应温度、反应时间等因素有关,也与Fe(Ⅱ)离子存在状态有关;Fe(Ⅱ)离子通过催化Ferrihydrite的溶解过程,从而加速整个相转化过程.对该过程的深入研究将对认识和了解自然条件下铁氧化物的形成与相互转化具有重要意义. 相似文献
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Fe(OH)2悬浮液在EDTA作用下氧气氧化生成δ-FeOOH的机理研究 总被引:1,自引:0,他引:1
At room temperature and in the presence of trace EDTA, the formation of δ-FeOOH was studied by the rapid oxidation of Fe(OH)2 suspension with O2. The structural and morphological changes were characterized by various techniques such as XRD, FTIR and TEM. γ-FeOOH and (δ-FeOOH) formed simutaneously in the early period of oxidation. But as the rate of mass transfer was in equilibrium, trace (γ-FeOOH) vanished gradually. Accordingly, pure phase δ-FeOOH was obtained. At the same time, critical amount ratio K of EDTA to Fe2+ was verified. The experiments show that the reactivity, rate of the oxidizing agent and pH of the initial medium were important factors for the formation of pure phase (δ-FeOOH). Under the auxiliary effect of EDTA, the reactivity of O2 was nearly improved to that of H2O2. And the process of the oxidation that Fe(OH)2 suspension was oxidized by O2 under that condition was discussed. 相似文献
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