Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 406, Issue -, Pages 178-185Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2013.05.063
Keywords
Aromatic polyamide dendrimer; Spirolactam-based molecular switch; Photocatalyst; TiO2; Visible irradiation
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Funding
- state key laboratory cultivation base for nonmetal composites and functional materials, China [10zxfk19]
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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. (C) 2013 Elsevier Inc. All rights reserved.
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