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Photocatalytic degradation of Red 2G on the suspended TiO2-hollow glass sphere

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Abstract

Anatase TiO2 was synthesized on Hollow glass spheres (HGS) by a sol–gel method in this work. TiO2/HGS composite (70% HGS + 30% TiO2) could be suspended in water to facilitate light absorption, and the particles were readily separated from water since they floated on water surface after treatment. The oxidation state of titanium (Ti4+) in TiO2/HGS composite was as same as that in pure TiO2, while the binding energies of Ti2p1/2 and Ti2p3/2 orbitals of TiO2/HGS had a slight 0.3 eV shift to high energy end. Nano-sized TiO2 crystals were tightly adhered on HGS surface, while the thickness of TiO2 film might be several hundred nanometers. The electron–hole pairs formed in TiO2 had a little longer lifetime than the electron–hole pairs formed in TiO2/HGS, proven by the photoluminescence intensity of emitted photons. Red 2G azo dye was used to study the degradation activity. The photocatalytic activity of TiO2/HGS composite was comparable to the activity of pure TiO2 particles. 81% of the initial Red 2G molecules (Red 2G solution 50 mL, 40 mg/L) were decomposed on TiO2/HGS composite in 170 min.

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Authors and Affiliations

  1. School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang, 110159, China

    Wenjie Zhang, Xiaoxiao Zhangsun & Yingjie Tao

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  1. Wenjie Zhang
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  2. Xiaoxiao Zhangsun
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  3. Yingjie Tao
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Correspondence to Wenjie Zhang.

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Zhang, W., Zhangsun, X. & Tao, Y. Photocatalytic degradation of Red 2G on the suspended TiO2-hollow glass sphere. Reac Kinet Mech Cat 134, 569–578 (2021). https://doi.org/10.1007/s11144-021-02078-6

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  • DOI: https://doi.org/10.1007/s11144-021-02078-6

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