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A novel UV-visible-driven TiO2/diatomite (TiD) composite was synthesized by one-pot solvothermal method with the assistance of cetyltrimethylammonium bromide (CTAB). Prepared samples were characterized by XRD, FESEM, FT-IR, XPS, BET, UV-vis DRS, and PL. The photocatalytic activities of TiD composites were assessed via the photocatalytic degradation of methyl orange (MO) under UV-visible light (350 ≤ λ ≤ 780 nm) irradiation. Some synthetic parameters in the solvothermal reaction, such as the weight ratio of diatomite/TiO2, solid-liquid ratio and HAc content, have a great influence on the photocatalytic properties of TiD. Photocatalytic reaction parameters including catalyst amount and dye concentration were also systematically studied. The as-synthesized TiD showed higher photocatalytic activities than bare TiO2. TiD-2 exhibited the highest photocatalytic activity. The degradation efficiency of MO were approximately 96.2%, at diatomite/TiO2 weight ratio of 1/1, HAc/H2O volume ratio of 7/3, catalyst dosage of 1.0 g/L and MO initial concentration of 20 mg/L after 60 min of photodegradation. The trapping experiments indicated that superoxide radical was the most important active species during the photocatalytic process. A reasonable photocatalytic mechanism was further proposed.

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TiO2/diatomite Composite Photocatalyst Prepared by Solvothermal Method: Optimization of Physicochemical Parameters and Degradation Mechanism Studies

  • 会议论文

  • 发表日期：

    2025年

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  • Ruirui Liu,
  • Shuai Xie,
  • Chunyan Zhao,
  • Jing Wang,
  • Zhijiang Ji

摘要

A novel UV-visible-driven TiO2/diatomite (TiD) composite was synthesized by one-pot solvothermal method with the assistance of cetyltrimethylammonium bromide (CTAB). Prepared samples were characterized by XRD, FESEM, FT-IR, XPS, BET, UV-vis DRS, and PL. The photocatalytic activities of TiD composites were assessed via the photocatalytic degradation of methyl orange (MO) under UV-visible light (350 ≤ λ ≤ 780 nm) irradiation. Some synthetic parameters in the solvothermal reaction, such as the weight ratio of diatomite/TiO2, solid-liquid ratio and HAc content, have a great influence on the photocatalytic properties of TiD. Photocatalytic reaction parameters including catalyst amount and dye concentration were also systematically studied. The as-synthesized TiD showed higher photocatalytic activities than bare TiO2. TiD-2 exhibited the highest photocatalytic activity. The degradation efficiency of MO were approximately 96.2%, at diatomite/TiO2 weight ratio of 1/1, HAc/H2O volume ratio of 7/3, catalyst dosage of 1.0 g/L and MO initial concentration of 20 mg/L after 60 min of photodegradation. The trapping experiments indicated that superoxide radical was the most important active species during the photocatalytic process. A reasonable photocatalytic mechanism was further proposed.