Micellar engineering of TiO₂ photocatalysts using a novel amide-functional gemini surfactant: Structure-activity correlation and dye degradation efficiency


Keşir M. K., Yıldız İ. S., BİLGEN S.

Journal of Environmental Chemical Engineering, cilt.14, sa.1, 2026 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 14 Sayı: 1
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1016/j.jece.2025.120965
  • Dergi Adı: Journal of Environmental Chemical Engineering
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, INSPEC
  • Anahtar Kelimeler: Cationic gemini surfactant, Critical micelle concentrations (CMC), Methylene blue degradation, Sol-gel hydrothermal method
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

The study focused on synthesizing a novel cationic gemini surfactant (CGS)-templated TiO2 nanoparticles through a sol-gel hydrothermal method aimed at degrading methylene blue (MB). The structural characteristics of the synthesized CGS and the surfactant-assisted TiO2 nanoparticles were analyzed using various spectroscopic and imaging techniques, including FT-IR, MS, 1H and 13C NMR, XRD, DRS, SEM, and BET. First of all, micellization behaviors such as critical micelle concentration (CMC), maximum surface excess (Γmax) and minimum area of head group (Amin) of CGS have been investigated by surface tension measurements at different temperatures. CGS has shown very low CMC and a good capacity to decrease surface tension of water. The CGS, utilized as a structure-directing agent, was synthesized and examined to evaluate its impact on the structural, morphological, and optical properties of TiO2 nanoparticles with a precise formulation of novelty in this study. The surfactant was used in quantities both above and below its critical micelle concentration (CMC). The photocatalytic efficiency of the modified samples was assessed by studying the degradation of a 10 ppm methylene blue (MB) solution under UV-A light. Using a UV–vis spectrophotometer for analysis, it was found that nanoparticles synthesized with either an equal concentration of CMC or half the CMC amount relative to the CGS demonstrated the highest effectiveness in degrading MB.