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<p>This study focuses on two key areas. Firstly, new ribbon-like carbon nanotubes (R-CNTs) have been synthesised for the first time. Secondly, polyaniline (PANI)-based composites with different contents (20–50 wt%) of R-CNTs were developed and obtained. R-CNTs-PANI-1-3 nanocomposites were synthesised by in situ oxidative polymerisation of aniline in acidic medium using ammonium persulfate. The structural, morphological, thermal, and surface properties of the resulting materials were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and nitrogen adsorption–desorption measurements. The adsorption characteristics of the R-CNTs-PANI-1-3 composite materials were evaluated concerning methyl orange (MO) and methylene blue (MB) used as model pollutants. The results of the experiments indicate a high adsorption capacity of the composites for MO. At the same time, the adsorption of MB remained insignificant even at high concentrations of the adsorbents. The influence of adsorbent dosage, contact time, solution pH, initial dye concentration, and temperature on MO uptake was systematically studied. Kinetic and equilibrium data were well described by the pseudo-second-order kinetic model and the Langmuir isotherm, respectively. The maximum monolayer adsorption capacities ranged from 170.45 to 399.72&#xa0;mg/g. Experimental results show that adsorption capacity of R-CNTs-PANI-2 is about 6 times that of PANI in same experimental conditions. Thermodynamic analysis indicated that the adsorption process was spontaneous and endothermic in nature. R-CNTs-PANI-1-3 are promising adsorbents with high potential for the purification of contaminated environments.</p> Graphical abstract <p></p>

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Polyaniline-ribbon-like carbon nanotubes composites: characterizations and applications in removing cationic and anionic dyes from aqueous medium

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • D. N. Gordeev,
  • G. S. Usmanova,
  • L. R. Latypova,
  • A. R. Yusupova,
  • A. G. Mustafin

摘要

This study focuses on two key areas. Firstly, new ribbon-like carbon nanotubes (R-CNTs) have been synthesised for the first time. Secondly, polyaniline (PANI)-based composites with different contents (20–50 wt%) of R-CNTs were developed and obtained. R-CNTs-PANI-1-3 nanocomposites were synthesised by in situ oxidative polymerisation of aniline in acidic medium using ammonium persulfate. The structural, morphological, thermal, and surface properties of the resulting materials were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and nitrogen adsorption–desorption measurements. The adsorption characteristics of the R-CNTs-PANI-1-3 composite materials were evaluated concerning methyl orange (MO) and methylene blue (MB) used as model pollutants. The results of the experiments indicate a high adsorption capacity of the composites for MO. At the same time, the adsorption of MB remained insignificant even at high concentrations of the adsorbents. The influence of adsorbent dosage, contact time, solution pH, initial dye concentration, and temperature on MO uptake was systematically studied. Kinetic and equilibrium data were well described by the pseudo-second-order kinetic model and the Langmuir isotherm, respectively. The maximum monolayer adsorption capacities ranged from 170.45 to 399.72 mg/g. Experimental results show that adsorption capacity of R-CNTs-PANI-2 is about 6 times that of PANI in same experimental conditions. Thermodynamic analysis indicated that the adsorption process was spontaneous and endothermic in nature. R-CNTs-PANI-1-3 are promising adsorbents with high potential for the purification of contaminated environments.

Graphical abstract