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<p>In this study, tetradecyldimethylbenzylammonium chloride (TDBAC)-modified montmorillonite (TDBAC-MMT) was successfully synthesized via ion exchange, and its structural characteristics and antibacterial activity were systematically investigated. Multiple characterization methods confirmed the effective intercalation of TDBAC into montmorillonite (MMT): X-ray diffraction (XRD) revealed significant structural reconstruction, attributed to the steric hindrance of the benzyl group and hydrophobic interactions of alkyl chains; scanning electron microscopy (SEM) showed reduced agglomeration and a looser, more porous surface morphology in TDBAC-MMT, increasing the effective surface area; Fourier transform infrared spectroscopy (FTIR) identified characteristic peaks at 1468&#xa0;cm<sup>−1</sup> (benzyl C–H bending vibration) and 2927&#xa0;cm<sup>−1</sup> (alkyl C–H stretching vibration), verifying the incorporation of organic components; and thermogravimetric analysis (TGA) reflected the modified thermal stability of the composite. Antibacterial tests demonstrated potent activity for TDBAC-MMT, showing a 16.01&#xa0;mm inhibition zone and a minimum inhibitory concentration (MIC) of 2&#xa0;mg/mL against <i>Escherichia coli</i>, a 18.04&#xa0;mm inhibition zone and a MIC of 0.5&#xa0;mg/mL against <i>Staphylococcus aureus</i>. When 0.5% TDBAC-MMT was added to latex paint, the antibacterial rate against both <i>E. coli</i> and <i>S. aureus</i>&#xa0;reached 99.9%. Additionally, after 28&#xa0;days of mold resistance testing, latex paint containing 0.5% TDBAC-MMT maintained a grade of 0 (no mold growth), indicating excellent mold resistance. This study provides a promising approach for the development of high-performance antibacterial and mold-resistant materials.</p>

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Enhanced antibacterial activity of montmorillonite through tetradecyldimethylbenzylammonium chloride intercalation

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • Taotao Yu,
  • Feng Yang,
  • Changchun Liu,
  • Shirong Xu,
  • Xi Chen,
  • Hong Sun,
  • Kenji Ogino

摘要

In this study, tetradecyldimethylbenzylammonium chloride (TDBAC)-modified montmorillonite (TDBAC-MMT) was successfully synthesized via ion exchange, and its structural characteristics and antibacterial activity were systematically investigated. Multiple characterization methods confirmed the effective intercalation of TDBAC into montmorillonite (MMT): X-ray diffraction (XRD) revealed significant structural reconstruction, attributed to the steric hindrance of the benzyl group and hydrophobic interactions of alkyl chains; scanning electron microscopy (SEM) showed reduced agglomeration and a looser, more porous surface morphology in TDBAC-MMT, increasing the effective surface area; Fourier transform infrared spectroscopy (FTIR) identified characteristic peaks at 1468 cm−1 (benzyl C–H bending vibration) and 2927 cm−1 (alkyl C–H stretching vibration), verifying the incorporation of organic components; and thermogravimetric analysis (TGA) reflected the modified thermal stability of the composite. Antibacterial tests demonstrated potent activity for TDBAC-MMT, showing a 16.01 mm inhibition zone and a minimum inhibitory concentration (MIC) of 2 mg/mL against Escherichia coli, a 18.04 mm inhibition zone and a MIC of 0.5 mg/mL against Staphylococcus aureus. When 0.5% TDBAC-MMT was added to latex paint, the antibacterial rate against both E. coli and S. aureus reached 99.9%. Additionally, after 28 days of mold resistance testing, latex paint containing 0.5% TDBAC-MMT maintained a grade of 0 (no mold growth), indicating excellent mold resistance. This study provides a promising approach for the development of high-performance antibacterial and mold-resistant materials.