| 纳米TiO2的制备及其表征 |
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| 引用本文： | 桑俊,陈芮. 纳米TiO2的制备及其表征[J]. 云南师范大学学报(自然科学版), 2014, 0(5): 63-67 |
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| 作者姓名： | 桑俊 陈芮 |
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| 作者单位： | 云南师范大学化学化工学院,云南昆明650500 |
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| 摘 要： | 以H2TiO3为主要原料,NH3·H2O为沉淀剂,采用均相沉淀法首先生成无定形TiO(OH)2前驱体,再经洗涤、过滤、干燥及灼烧得到纳米TiO2.采用热重分析仪分析了前驱体的热分解行为;采用紫外-可见分光光度计、X-射线粉末衍射仪及透射电子显微镜分别对样品的紫外吸收特性、晶型、粒子形貌及尺寸等进行了表征.结果表明:所制得的纳米TiO2为四方晶系金红石结构,呈球状或椭球状,在近紫外光区有一强的吸收,对应的波长约为340nm;在800℃下灼烧2.5h制得的纳米TiO2的紫外吸收性能最佳.
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| 关 键 词： | 纳米二氧化钛 直接沉淀法 前驱体 紫外吸收 晶型 |
Preparation and Characterization of Nano-titanium Dioxide |
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| SANG Jun,CHEN Rui. Preparation and Characterization of Nano-titanium Dioxide[J]. Journal of Yunnan Normal University (Natural Sciences Edition), 2014, 0(5): 63-67 |
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| Authors: | SANG Jun CHEN Rui |
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| Affiliation: | (School of Chemistry and Chemical Engineering,Yunnan Normal University,Kunming 650500,China) |
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| Abstract: | Using H2TiO3 as main reagent and NH3·H2O as precipitant,precursor TiO（OH）2 was prepared by homogeneous precipitation method.Then,nano-TiO2 was gained after the precursor was sintered at different temperatures.The decomposition process of the precursor was analyzed by the thermogravimetry and differential thermogravimetry（TG-DTG）curve.Ultraviolet absorption characteristics,crystallization and size of nano-TiO2 were tested by means of ultraviolet-visible absorption spectrophotometer,X-ray powder diffractometer（XRD）and transmission electron microscopy（TEM）,respectively.The result suggested that nano-TiO2,ellipsoidal tetragonal rutile structure is synthesized at 800 ℃ for 2.5hby homogeneous precipitation method,which were regarded as the optimal synthesis conditions. |
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| Keywords: | Nano-titanium dioxide Direct precipitation method Precursor Ultraviolet absorption Crystallization |
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