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The influences of hexadecyl trimethyl ammonium bromide on lanthanum titanate photocatalyst for ofloxacin degradation


The use of template to introduce porous structure in titanate is a novel research topic, especially if photocatalytic activity of the material can be improved. The porous lanthanum titanate photocatalyst was synthesized using hexadecyl trimethyl ammonium bromide (HTAB) as the template in a sol–gel route. The addition of HTAB in the precursor could obviously influence the porous structure and surface morphology of the lanthanum titanate samples. All the samples were composed of perovskite La2Ti2O7, and crystallization of La2Ti2O7 was reduced with rising HTAB concentration. There was a slight enlargement in the band gap energy after using HTAB, and the chemical environments of the elements in the porous lanthanum titanate samples did not change. The enhancement in photocatalytic degradation efficiency was achieved on the lanthanum titanate samples obtained using HTAB. The first order reaction rate constants were increased from 0.0131 min−1 of the nonporous sample to 0.0253 min−1 of the porous sample. All the ofloxacin molecules were degraded on the porous lanthanum titanate sample after 120 min of reaction. Decomposition of ofloxacin in photocatalytic process was identified by the reduced absorption intensities of the organic groups in the UV–Vis spectra.


  • HTAB-mediated sol–gel route was used to synthesize the porous lanthanum titanate.

  • The intercrystal pores were produced in the samples when HTAB was removed.

  • The crystallite size of the La2Ti2O7 decreased with rising HTAB concentration.

  • Enhanced degradation efficiency was achieved on the samples obtained using HTAB.

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This work was supported by Scientific Research Fund of Liaoning Provincial Education Department (No. LG201913).

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Correspondence to Wenjie Zhang or Hong Wang.

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Han, M., Ma, Z., Zhang, W. et al. The influences of hexadecyl trimethyl ammonium bromide on lanthanum titanate photocatalyst for ofloxacin degradation. J Sol-Gel Sci Technol (2020). https://doi.org/10.1007/s10971-020-05341-9

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  • Lanthanum titanate
  • Photocatalytic degradation
  • Hexadecyl trimethyl Ammonium bromide
  • Ofloxacin