化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (12) : 117-120.

新材料与新技术

纳米TiO₂微球的制备及其光催化性能研究

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Preparation and photocatalytic performance of nano-TiO₂ microspheres

Ying Xuchao¹, Zhao Junwei¹, Du Jingjing², Cheng Xiaomin²

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Received		Published
2018-06-29		2019-12-20
Issue Date	Revised Date
2020-01-03	2018-06-29

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摘要

以四氯化钛为钛源,采用无模板溶剂热法合成了纳米TiO₂微球,采用X射线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)、紫外-可见分光光度计(UV-Vis)、N₂吸附-脱附等分析方法对样品进行表征,考察水热反应时间对纳米TiO₂微球的形成及光催化降解气相苯的影响。结果表明:纳米TiO₂微球是由锐钛矿相纳米颗粒自组装形成的分级微/纳结构,光吸收出现“蓝移”,比表面积高达239.2m²/g;纳米TiO₂微球的结构参数对其最终的光催化性能影响较大,在水热温度180℃、水热反应时间24h条件下制备的纳米微球表现出最高的光催化活性,其矿化率高于商用P25TiO₂近2倍;纳米TiO₂微球优异的光催化性能得益于其优良的结晶度、相对大的比表面积和丰富的介孔结构。

Abstract

The nano-TiO₂ microspheres were synthesized via a solvothermal method using titanium chloride as precursor.The samples were characterized and analyzed by X-ray diffractometer (XRD),transmission electro microscope (TEM),ultrariolet and visible spectrophotometer (UV-Vis),N₂ absorption-adsorption spectrometer (BET).The effects of reaction time on the microspheres formation and the photocatalytic degradation of gaseous benzene were studied.The results showed that TiO₂ microspheres were formed by self-assembly of anatase nanoparticles,the optical absorption edges of the samples had “blue shift”,the specific surface area reached 239.2m²/g.Futher study indicated that those structural parameters had a great effect on the final photocatalytic performance,and the TiO₂ microspheres prepared at 180℃,24h showed the highest photocatalytic activity,exceeding that of commercial P25 TiO₂ for nearly two times,due to its excellent crystallinity,relative high specific surface area and abundant mesopores.

关键词

纳米TiO₂微球 / 溶剂热法 / 比表面积 / 光催化 / 气相苯

Key words

nano-TiO₂ microsphere / solvothermal method / specific surface area / photocatalysis / gaseous benzene

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纳米TiO₂微球的制备及其光催化性能研究[J]. 化工新型材料, 2019, 47(12): 117-120 DOI:

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