首页|Highly sensitive fluorescent sensing and photocatalytic degradation performance of two-dimensional Tb-organic network
Highly sensitive fluorescent sensing and photocatalytic degradation performance of two-dimensional Tb-organic network
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A novel tetra-nuclear Tb-organic network,named as[Tb4(2-pyia)6(HAc)0.5(2,2'-bipy)(H2O)4.5]·2,2'-bipy·H2O(1),was synthesized hydrothermally based on 5-(pyridin-2-ylmethoxy)isophthalic acid(H2pyia)and 2,2'-bipyridine(2,2'-bipy)ligands,and characterized by single crystal X-ray diffraction,thermogravimetric(TG)analyses,powder X-ray diffraction(PXRD)and infrared(IR)technology.1 pos-sesses a two-dimensional network based on the tetra-nuclear inorganic building units,and theππstacking interactions between the pyia2-ligands and the guest 2,2'-bipy molecules play an important role in the forming of 3D supramolecular structure.1 exhibits excellent fluorescent sensing performance for Fe3+(1.26 × 10-8 mol/L),Cr2O72-(8.1 × 10-7 mol/L),2,4,6-trinitrophenol(TNP)(2.71 × 10-8 mol/L)and tetracycline(TCT)(2.76 × 10-7 mol/L)in aqueous solution with lower detection concentrations.The sensing mechanisms of 1 were investigated by density functional theory(DFT)calculations,ultraviolet-visible(UV-Vis)diffuse reflectance spectroscopy,PXRD and fluorescent lifetime analyses.The activated product of 1 was prepared by heating at 255 ℃ under constant pressure and used to photo-catalytically degrade TCT.Both 1 and the activated one have good photocatalytic degradation performance for TCT with degradation rates of 84.29％and 96.07％,respectively.The photocatalytic mechanisms were discovered by UV-Vis diffuse reflectance spectroscopy and radical trap experiments.The Tb-organic framework might be an excellent multifunctional fluorescent sensor and a good photocatalytic agent for TCT degradation in the future.
Ting Gao、Zhihu Ma、Yixia Ren、Zhixiang Wang、Meili Zhang、Xiaoli Chen、Jijiang Wang
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Laboratory of New Energy and New Function Materials,Shaanxi Key Laboratory of Chemical Reaction Engineering,College of Chemistry and Chemical Engineering,Yan'an University,Yan'an,716000,China
National Natural Science Foundation of ChinaYouth Innovation Team of Shaanxi Universities
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