Visible light photocatalytic activity of aromatic polyamide dendrimer/TiO₂ composites functionalized with spirolactam-based molecular switch

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• 作者：Yonglin Lei ; Chi Zhang ; Hong Lei ; Jichuan Huo
• 关键词：Aromatic polyamide dendrimer ; Spirolactam-based molecular switch ; Photocatalyst ; TiO2 ; Visible irradiation
• 刊名：Journal of Colloid and Interface Science
• 出版年：2013
• 出版时间：15 September, 2013
• 年：2013
• 卷：406
• 期：Complete
• 页码：178-185
• 全文大小：2043 K

文摘

A novel aromatic polyamide dendrimer-TiO₂ hybrid photocatalyst functionalized with spirolactam-based molecular switch (RG-TiO₂) was synthesized. The materials were characterized by FT-IR and scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and UV-vis diffuse reflectance spectroscopy, in comparison with reference materials (plain TiO₂). The photocatalytic activity and photostability of RG-TiO₂ were investigated based on the degradation of phenol under visible light irradiation. The results showed that the RG-TiO₂ hybrid photocatalyst enhanced photocatalytic efficiency of photodegradation of phenol compared with the as-prepared plain TiO₂ under visible light irradiation. More significantly, when the RG-TiO₂ was acidified to pH 3, the RG-TiO₂ was readily transformed from spirolactam form (OFF) to the ring-opened amide form (ON). And the photocatalytic stability of ring-opened RG-TiO₂ (switch off form) was much lower than that of ring-closed RG-TiO₂ (switch on form). The novel fabrication method of the TiO₂ photocatalyst provides a valuable way for developing highly efficient and controllable photocatalysts by molecular switch.