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

doi:10.3724/SP.J.1077.2011.11325

Abstract

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

CLC Number:

TB321

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.

Figures/Tables 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

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