三维TiO2陶瓷网络的直写无模成型及结构设计对其光催化性能的调制作用

doi:10.3724/SP.J.1077.2011.11325

摘要/Abstract

摘要：

通过浆料直写无模成型技术制备了三维的TiO₂网络结构, 所得结构在空气中1150℃的条件下煅烧2 h, 并用于亚甲基蓝的光催化分解. 分别通过X射线衍射和扫描电子显微镜研究了烧成样品的物相结构和形貌. 用紫外-可见分光光度计表征了烧成样品的光催化分解性能, 结果显示本结构样品的光催化性能优于同质量的圆柱状样品. 此外, 本实验设计了三种不同的网络结构, 烧成后进行光催化降解性能测试. 结果显示: 通过合理的结构设计, 网络样品的光催化降解性能可提高大于60%的程度. 样品催化性能的提高可归因于催化剂结构设计所带来的材料对光辐射吸收的增强.

关键词: 直写成型, 陶瓷, 光催化, TiO₂

Abstract:

3D meshes of TiO₂ were fabricated by direct writing and subsequently sintered at 1150℃ for 2 h in an air atmosphere for photocatalytic degradation (PCD) of methylene blue(MB) solution. The crystal structure and morphology of the samples were determined by X-ray diffraction(XRD) and scanning electron microscope(SEM). PCD properties of the sintered meshes were obtained in an ultraviolet-visible light spectrophotometer, and were found to be better than that of cylindrical samples with the same weight. Three kinds of mesh structures were designed, sintered and measured. The results show that reasonable design could cause significant enhancement in the PCD activity by more than 60%. This enhancement could be attributed to irradiation absorption increment, which was caused by structure design of photocatalyst.

Key words: direct-write, ceramics, photocatalysis, TiO₂

中图分类号:

TB321

蔡坤鹏, 李亚运, 孙振新, 孙竞博, 李勃, 周济. 三维TiO₂陶瓷网络的直写无模成型及结构设计对其光催化性能的调制作用[J]. 无机材料学报, 2012, 27(1): 102-106.

CAI Kun-Peng, LI Ya-Yun, SUN Zhen-Xin, SUN Jing-Bo, LI Bo, Zhou JI. Preparation of 3D Ceramic Meshes by Direct-write Method and Modulation of Its Photocatalytic Properties by Structure Design[J]. Journal of Inorganic Materials, 2012, 27(1): 102-106.

图/表 5

Fig. 1 (a) Optical graph of as-dried mesh; (b) Image of cross section of sintered mesh; (c) SEM image of mesh surface; (d) XRD pattern of sintered sample

Fig. 2 (a) Schematic diagram of the irradiation step, (b) the transmittance of the MB solution with none photocatalyst after irradiation of 0 s, 90 s, 180 s, 270 s, 360 s and 450 s, and (c) the transmittance of the MB solutions catalyzed by cylindrical sample and mesh structure A for 270 s, dark environment experimental results of mesh structure A for 270 s are also provided. Left inset in (a) shows the top view, front view and left view of a typical mesh structure

Fig. 3 Schematic illustrations of three mesh designs: top view of (a) A, (b) B, (c) C, front view of (d) A, (e) B, (f) C, and left view of (g) A, (h) B, (i) C

Fig. 4 Transmittance spectra of MB solution catalyzed by (a) structure A, B and C for 270 s and 450 s, (b) structure A for 450 s and structure C for 270 s

Fig. 5 (a) UV-Visible absorption spectra of 1.5 mL water, with meshes placed in, and (b) the calculated degeneration of MB solution photocatalysed by structure A, B and C, respectively, for irradiation of 450 s. Absorbance of light in water with the corresponding mesh under UV irradiation of 365 nm is also illustrated

参考文献 19

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三维TiO₂陶瓷网络的直写无模成型及结构设计对其光催化性能的调制作用

Preparation of 3D Ceramic Meshes by Direct-write Method and Modulation of Its Photocatalytic Properties by Structure Design

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