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<p>Traditional TiO<sub>2</sub> photocatalysts have limitations including poor visible-light response, serious powder agglomeration and loss, and unsatisfactory cycling stability. Herein, an Ag-decorated black TiO<sub>2</sub>@SiO<sub>2</sub> flexible ceramic membrane was prepared with SiO<sub>2</sub> fiber membrane as the support via oxygen defect regulation and silver loading. A 3D interconnected SiO<sub>2</sub> skeleton was fabricated by electrospinning and high-temperature crystallization. Oxygen-deficient black TiO<sub>2</sub> was synthesized through reduction treatment, and silver nanoparticles were uniformly loaded by in situ liquid-phase reduction. XRD, SEM, XPS, and UV–Vis DRS were applied to characterize the materials and explore the modification mechanism. Oxygen defects broaden visible-light absorption and enrich active sites, while the surface plasmon effect of Ag promotes carrier separation. Their synergism greatly enhances photocatalytic performance. The membrane retains intact structure after cycles with no active component shedding, enabling convenient recovery and reuse. This material integrates high catalytic efficiency and structural stability, offering a novel route for developing flexible photocatalysts and practical wastewater treatment.</p>

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Study on preparation and photodegradation performance of Ag-doped black TiO2@SiO2 flexible ceramic membrane with oxygen defect regulation

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Jihao Chen,
  • Shouzhu Li

摘要

Traditional TiO2 photocatalysts have limitations including poor visible-light response, serious powder agglomeration and loss, and unsatisfactory cycling stability. Herein, an Ag-decorated black TiO2@SiO2 flexible ceramic membrane was prepared with SiO2 fiber membrane as the support via oxygen defect regulation and silver loading. A 3D interconnected SiO2 skeleton was fabricated by electrospinning and high-temperature crystallization. Oxygen-deficient black TiO2 was synthesized through reduction treatment, and silver nanoparticles were uniformly loaded by in situ liquid-phase reduction. XRD, SEM, XPS, and UV–Vis DRS were applied to characterize the materials and explore the modification mechanism. Oxygen defects broaden visible-light absorption and enrich active sites, while the surface plasmon effect of Ag promotes carrier separation. Their synergism greatly enhances photocatalytic performance. The membrane retains intact structure after cycles with no active component shedding, enabling convenient recovery and reuse. This material integrates high catalytic efficiency and structural stability, offering a novel route for developing flexible photocatalysts and practical wastewater treatment.