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<p>Adsorption is a highly efficient, cost-effective, and sustainable method for pollutant removal, distinguished by its ease of adsorbent regeneration and the utilization of accessible materials. This study explores the synthesis and characterization of pure polyaniline (PAni with0 wt% of TiO<sub>2</sub>) and its modified composites, integrated with titanium dioxide (TiO<sub>2</sub>) at varying weight percentages (<i>x</i> = 5, 10, 20, and 40 wt%), to develop advanced adsorbent powders. A comprehensive suite of analytical techniques including FTIR, XRD, SEM-EDX, AFM, UV-vis spectroscopy, and four-point probe measurements was employed to evaluate the structural and electrical properties of the materials. XRD analysis confirmed that TiO<sub>2</sub> incorporation significantly enhances the crystallization of the PAni matrix, while SEM imaging revealed a distinct morphological transition from the fibrous, branched structure of pure PAni to a sophisticated flower-like morphology in the PAni-<i>x</i>%TiO<sub>2</sub> composites. Optical and AFM investigations further validated the successful dispersion of TiO<sub>2</sub> and its influence on UV absorbance shifts. Incorporating small amounts of TiO<sub>2</sub>(5 and 10 wt%) into PAni creates a synergistic interaction that substantially increases the composite’s electrical conductivity. The practical efficacy of these materials was demonstrated through the adsorption of methylene blue dye from aqueous solutions. Remarkably, under complete darkness to eliminate photocatalytic effects, the PAni-20%TiO<sub>2</sub> composite achieved a peak removal efficiency of 69% in only 35&#xa0;min. These findings underscore the potential of PAni/TiO<sub>2</sub> composites as rapid, high-performance adsorbents for organic dye remediation in water treatment applications.</p>

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Synthesis, structural and optical characterization of polyaniline-titanium dioxide composites for methylene blue removalfrom aqueous media through adsorption

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Ouafia Belgherbi,
  • Lamria Seid,
  • Samah Boudour,
  • Souad Laghrib,
  • Leila Lamiri,
  • Ştefan Ţălu,
  • Lotfi Khezami,
  • Mamoun Fellah

摘要

Adsorption is a highly efficient, cost-effective, and sustainable method for pollutant removal, distinguished by its ease of adsorbent regeneration and the utilization of accessible materials. This study explores the synthesis and characterization of pure polyaniline (PAni with0 wt% of TiO2) and its modified composites, integrated with titanium dioxide (TiO2) at varying weight percentages (x = 5, 10, 20, and 40 wt%), to develop advanced adsorbent powders. A comprehensive suite of analytical techniques including FTIR, XRD, SEM-EDX, AFM, UV-vis spectroscopy, and four-point probe measurements was employed to evaluate the structural and electrical properties of the materials. XRD analysis confirmed that TiO2 incorporation significantly enhances the crystallization of the PAni matrix, while SEM imaging revealed a distinct morphological transition from the fibrous, branched structure of pure PAni to a sophisticated flower-like morphology in the PAni-x%TiO2 composites. Optical and AFM investigations further validated the successful dispersion of TiO2 and its influence on UV absorbance shifts. Incorporating small amounts of TiO2(5 and 10 wt%) into PAni creates a synergistic interaction that substantially increases the composite’s electrical conductivity. The practical efficacy of these materials was demonstrated through the adsorption of methylene blue dye from aqueous solutions. Remarkably, under complete darkness to eliminate photocatalytic effects, the PAni-20%TiO2 composite achieved a peak removal efficiency of 69% in only 35 min. These findings underscore the potential of PAni/TiO2 composites as rapid, high-performance adsorbents for organic dye remediation in water treatment applications.