Yonglin Lei

Southwest University of Scienc... · Materials science and engineering institution


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    Yonglin Lei, Chi Zhang, Hong Lei, Jichuan Huo
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    ABSTRACT: 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.
    Journal of Colloid and Interface Science 06/2013; · 3.55 Impact Factor
  • Yonglin Lei, Yuanqiang Su, Jichuan Huo
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    ABSTRACT: A novel poly (amidoamine) (PAMAM) dendrimer, comprising rhodamine B unit in the core and 1-phenyl-3-methyl-5-pyrazolone unit at the periphery, has been synthesized and characterized. The dendrimer shows dramatic increase in its fluorescence intensity in the presence of proton and metal cations, especially in the presence of Cr(3+). The complex formed by dendrimer and Cr(3+) in ethanol solution has also been studied, considering the potential application for Cr(3+) fluorescent sensor. The influence of the unique chemical structure and resulted photoinduced electron transfer, as well as spirolactam ring-opening on the photophysical properties of the product has been investigated.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 08/2011; 83(1):149-54. · 1.98 Impact Factor
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    Yonglin Lei, Yuanqiang Su, Jichuan Huo
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    ABSTRACT: Two novel poly(amidoamine) (PAMAM) dendrimers, comprising rhodamine B unit in the core and 1-phenyl-3-methyl-5-pyrazolone unit at the periphery, have been synthesized and characterized. Both dendrimers displayed high selectivity and sensitivity towards Cr3+ ion. As considering the potential of being applied as fluorescent sensors for Cr3+ ion, we studied the complexes formed between the dendrimers and Cr3+ ion. Different PAMAM dendrimers had different recognition mechanism towards Cr3+ ion. For dendrimer G2, the recognition of Cr3+ was mainly due to the ring-opening of spirolactam. However, it significantly depended on the simultaneous effect of ring-opening of spirolactam and photoinduced electron transfer (PET) in the case of dendrimer G3.Highlights► First synthesize two novel PAMAM simultaneously containing rhodamine and pyrazolone. ► Novel dendrimer show high selectivity and sensitivity towards Cr3+. ► Recognition Cr3+ of dendrimer G2 is dominantly due to the ring-opening mechanism. ► Sensing Cr3+ of dendrimer G3 is dependent on simultaneous mechanisms of ring-opening and PET.
    Journal of Luminescence 01/2011; 131(12):2521-2527. · 2.14 Impact Factor

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