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首页> 外文期刊>Journal of Materials Science >TEM characterization of iron-oxide-coated ceramic membranes
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TEM characterization of iron-oxide-coated ceramic membranes

机译：氧化铁涂层陶瓷膜的TEM表征

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Commercially available porous alumina-zirconia-titania ceramic (AZTC) membranes having a titania surface coating were characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), and the Brunauer-Emmett-Teller (BET) method. TEM photomicrographs showed the as-received AZTC membrane to be a multi-layered structure consisting of a porous alumina-zirconia-titania core having ultrafine pore sizes, coated by an additional layer of nanoporous titania. Electron diffraction studies revealed an amorphous surface titania layer while the underlying AZTC membrane was crystalline. The AZTC membranes were coated 20, 30, 40, 45, or 60 times with iron oxide (Fe2O3) nanoparticles, after which the membranes were sintered in air at 900 degrees C for 30 min. TEM revealed a relatively uniform nanoporous Fe2O3 coating on the sintered, coated membranes, where the Fe2O3 coating thickness increased with increasing number of layers. Electron diffraction patterns showed the Fe2O3 coating to be crystalline in nature. This was confirmed by the XRD results showing the structure to be alpha-Fe2O3, while the AZTC membrane was a mixture of the anatase and rutile phase of TiO2 as well as ZrO2 and corundum, Al2O3. The average pore size of the underlying AZTC membrane increased after the Fe2O3-coated membrane was sintered. The nanoporosity in the sintered Fe2O3 coating increased until 40 layers, beyond which no significant increases in the average pore size were observed. The iron-oxide-coated membrane improved catalytic properties when used in combination with ozone to treat water. The optimal benefit, in terms of water treatment efficacy, was found at 40 layers of Fe2O3.
机译：使用透射电子显微镜（TEM），X射线衍射（XRD）和Brunauer-Emmett-Teller（BET）方法对具有二氧化钛表面涂层的可商购获得的多孔氧化铝-氧化锆-二氧化钛陶瓷（AZTC）膜进行表征。 TEM显微照片显示，所接收的AZTC膜是一种多层结构，由具有超细孔径的多孔氧化铝-氧化锆-二氧化钛芯组成，并被纳米多孔二氧化钛的另一层涂层所覆盖。电子衍射研究显示出非晶态的表面二氧化钛层，而下面的AZTC膜是结晶的。 AZTC膜用氧化铁（Fe2O3）纳米颗粒涂覆20、30、40、45或60次，然后在900摄氏度的空气中烧结30分钟。 TEM显示在烧结的涂膜上有相对均匀的纳米多孔Fe2O3涂层，其中Fe2O3涂层的厚度随层数的增加而增加。电子衍射图表明Fe2O3涂层本质上是结晶的。 XRD结果证实了这一点，即结构为α-Fe2O3，而AZTC膜是锐钛矿和金红石相TiO2以及ZrO2和刚玉Al2O3的混合物。烧结Fe2O3涂层的膜后，下面的AZTC膜的平均孔径增加。烧结的Fe2O3涂层中的纳米孔隙度增加，直到40层为止，在此之上没有观察到平均孔径的显着增加。当与臭氧结合使用来处理水时，涂有氧化铁的膜改善了催化性能。在水处理功效方面，发现了40层Fe2O3的最佳益处。

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