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<p>We report the first phytochemical-guided, one-pot sol–gel/hydrothermal synthesis of mesoporous anatase TiO<sub>2</sub> nanoparticles (&lt; 10&#xa0;nm) directed by catechin-rich fractions (epigallocatechin-3-gallate (EGCG), epicatechin-3-gallate (ECG), epigallocatechin (EGC)) identified through GC–MS of a <i>TV-26 Camellia sinensis</i> extract. These small-molecule bio-templates drive uniform Ti<sup>4</sup>⁺ nucleation, arrest crystal growth, and remain grafted to the oxide surface, producing a high specific surface area (160 m<sup>2</sup>&#xa0;g<sup>−1</sup>) and a stable polyphenol corona. Comprehensive characterization (XRD, UV–Vis-DRS, FTIR, BET, SEM/TEM) confirms the phase-pure anatase and a narrow size distribution (6–9&#xa0;nm). The bio-templated TiO<sub>2</sub> attains &gt; 98% mineralization of methylene blue under near-UV irradiation (365&#xa0;nm, 65 mW cm⁻<sup>2</sup>) within 45&#xa0;min, giving a pseudo-first-order rate constant k = 0.0567&#xa0;min<sup>−1</sup>, more than double that of commercial P25 under identical conditions. Surface-bound catechins impart intrinsic antioxidant activity, with IC₅₀ values of 34.7 ± 1.2&#xa0;µg mL<sup>−1</sup> (DPPH) and 29.3 ± 0.9&#xa0;µg mL<sup>−1</sup> (ABTS). By uniting green synthesis, size-controlled mesoporosity, and dual photocatalytic/radical-scavenging functionality, this work positions phytochemical-engineered TiO<sub>2</sub> as a versatile platform for next-generation water remediation and biomedical technologies.</p>

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EGCG/ECG-controlled mesoporous and ultrafine TiO₂ nanoparticles for UV-driven pollutant mineralization and radical scavenging

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月19日

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  • Sumit Thakur,
  • Jyoti Gaur,
  • Anand Somvanshi,
  • Suhas Ballal,
  • Kishor Kumar,
  • Kasim Sakran Abass,
  • Pramod Kumar,
  • Sandeep Kaushal,
  • Sanjeev Kumar

摘要

We report the first phytochemical-guided, one-pot sol–gel/hydrothermal synthesis of mesoporous anatase TiO2 nanoparticles (< 10 nm) directed by catechin-rich fractions (epigallocatechin-3-gallate (EGCG), epicatechin-3-gallate (ECG), epigallocatechin (EGC)) identified through GC–MS of a TV-26 Camellia sinensis extract. These small-molecule bio-templates drive uniform Ti4⁺ nucleation, arrest crystal growth, and remain grafted to the oxide surface, producing a high specific surface area (160 m2 g−1) and a stable polyphenol corona. Comprehensive characterization (XRD, UV–Vis-DRS, FTIR, BET, SEM/TEM) confirms the phase-pure anatase and a narrow size distribution (6–9 nm). The bio-templated TiO2 attains > 98% mineralization of methylene blue under near-UV irradiation (365 nm, 65 mW cm⁻2) within 45 min, giving a pseudo-first-order rate constant k = 0.0567 min−1, more than double that of commercial P25 under identical conditions. Surface-bound catechins impart intrinsic antioxidant activity, with IC₅₀ values of 34.7 ± 1.2 µg mL−1 (DPPH) and 29.3 ± 0.9 µg mL−1 (ABTS). By uniting green synthesis, size-controlled mesoporosity, and dual photocatalytic/radical-scavenging functionality, this work positions phytochemical-engineered TiO2 as a versatile platform for next-generation water remediation and biomedical technologies.