Photocatalytic activity of phthalocyanine-sensitized TiO₂-SiO₂ microparticles irradiated by visible light

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• 作者：Zhenfu Huang ; Binbin Zheng ; Shun Zhu ; Yuyuan Yao ; ^{yyy0571@126.com" class="auth_mail} ; Yuting Ye ; Wangyang Lu ; Wenxing Chen
• 关键词：Phthalocyanine sensitization ; Titanium dioxide ; Visible light
• 刊名：Materials Science in Semiconductor Processing
• 出版年：September 2014
• 年：2014
• 卷：25
• 期：Complete
• 页码：148-152
• 全文大小：1346 K

文摘

Zinc phthalocyanine (ZnPc) modified by cyanuric chloride was supported on TiO₂–SiO₂ microparticles (ZnPc–SiO₂–TiO₂) by covalent bonds to produce a novel photosensitizer, ZnPc–SiO₂–TiO₂. ZnPc sensitized TiO₂ to light in the visible range, while the TiO₂ acted as an acceptor of electrons generated by the photon irradiation; thus, this material can absorb low-energy photons to emit photons of higher energy. The as-prepared ZnPc–SiO₂–TiO₂ was characterized using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and UV–vis diffuse reflectance spectroscopy (DRS). The results of photodecomposing methylene blue (MB) revealed that ZnPc–SiO₂–TiO₂ had great photocatalytic activity under visible-light irradiation (位>400 nm). By analyzing electron paramagnetic resonance (EPR) spectra, we proposed a possible mechanism for the photodecomposition of MB by ZnPc–SiO₂–TiO₂.