Synergistic effect of tannic acid and metal-doping for enhancing visible light-driven photocatalytic degradation performance of TiO2/TAPU composite membrane

Songbo Dai, Xiaohan Yang, Fufen Li, Yuqing He, Xiudan Tao, Zhengjun Li

Research output: Contribution to journalArticlepeer-review

Abstract

Water pollution poses a significant environmental challenge, and photocatalytic degradation stands out as an efficient, cost-effective, and sustainable treatment method. In this study, we report on a novel approach involving the facile physical blending of sol-gel synthesized Zn- or Zr-doped TiO2 particles with tannic acid (TA) decorated polyurethane (TAPU) to create photocatalytic composite membranes (Zn-TiO2/TAPU or Zr-TiO2/TAPU). The photocatalytic performances of composite membranes were systematically evaluated under visible-light irradiation using methylene blue, rhodamine B, and crystal violet as model dyes. Our findings highlighted the pivotal role of tannic acid in enhancing the photocatalytic activity of the composite membranes, and elucidated the synergistic mechanism between tannic acid on polyurethane macromolecular chain and metal-doped TiO2 photocatalyst. The results indicated that the photocatalytic activity of metal-doped TiO2 surpassed that of pure TiO2, and particularly Zr-doped TiO2 outperformed Zn-doped TiO2. Notably, the composite membranes obtained by compounding metal-doped TiO2 into TAPU possessed significantly enhanced photocatalytic activity. Our research findings indicate that the synergistic effect of TA existing in polyurethane chains and doped metal significantly enhances the visible light-driven photocatalytic performance of the composite membrane, while maintaining excellent reusability and stability. This advancement provides a broad prospect for the practical application of photocatalytic technology in environmental remediation and other fields.

Original languageEnglish
Article number136175
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume709
DOIs
StatePublished - Mar 20 2025
Externally publishedYes

Keywords

  • Dye degradation
  • Metal-doped TiO
  • Photocatalytic composite membrane
  • Tannic acid
  • Visible light-driven

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