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<p>In this work, high-performance Fe<sub>3</sub>O<sub>4</sub>/MWCNT/CdS magnetic nanocatalysts were fabricated using a simple, low-temperature reflux method. The prepared Fe<sub>3</sub>O<sub>4</sub>/MWCNT/CdS magnetic nanocomposites were characterized using various analytical techniques including field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy, Brunauer–Emmett–Teller surface area analysis (BET), vibrating sample magnetometry (VSM), zeta potential analysis, photoluminescence spectroscopy (PL), ultraviolet–visible spectroscopy (UV–Vis), and Fourier transform infrared spectroscopy (FT-IR). The successful formation of Fe<sub>3</sub>O<sub>4</sub>/MWCNT/CdS nanocomposites was confirmed by XRD, PL, EDS, UV–Vis, FESEM, FT-IR, and TEM analysis. Zeta potential analysis showed that the prepared nanocatalysts had -21.6 mV, which results in high-performance catalytic activity of Fe<sub>3</sub>O<sub>4</sub>/MWCNT/CdS nanocomposites. The VSM analysis results showed that Fe<sub>3</sub>O<sub>4</sub>/MWCNT/CdS nanocomposites had high magnetic ability with magnetization saturation of 54 emu.g<sup>−1</sup>, which results in simple and fast separation of nanocatalyst from media after the treatment process. The dark catalyst activity results showed that Fe<sub>3</sub>O<sub>4</sub>/MWCNT/CdS nanocomposites had excellent catalytic activity for the degradation of crystal violet, methylene blue, and rhodamine B dyes from water. The obtained results showed that 100% of crystal violet, 94.2% of methylene blue, and 91.7% of rhodamine B dyes were degraded in 5 min. Based on this research, experimental results confirmed that Fe<sub>3</sub>O<sub>4</sub>/MWCNT/CdS magnetic nanocomposites had good potential for the purification of water from pollutant dyes in a simple and fast treatment process.</p>

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Fe3O4/MWCNT/CdS nanocomposites: efficient dark catalyst nanomaterial for treatment of water and wastewater from crystal violet, methylene blue, and rhodamine B dyes

  • 期刊论文

  • 发表日期：

    2026年8月2日

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  • Farzad Farahmandzadeh,
  • Elham Molahosseini,
  • Mehdi Molaei

摘要

In this work, high-performance Fe3O4/MWCNT/CdS magnetic nanocatalysts were fabricated using a simple, low-temperature reflux method. The prepared Fe3O4/MWCNT/CdS magnetic nanocomposites were characterized using various analytical techniques including field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy, Brunauer–Emmett–Teller surface area analysis (BET), vibrating sample magnetometry (VSM), zeta potential analysis, photoluminescence spectroscopy (PL), ultraviolet–visible spectroscopy (UV–Vis), and Fourier transform infrared spectroscopy (FT-IR). The successful formation of Fe3O4/MWCNT/CdS nanocomposites was confirmed by XRD, PL, EDS, UV–Vis, FESEM, FT-IR, and TEM analysis. Zeta potential analysis showed that the prepared nanocatalysts had -21.6 mV, which results in high-performance catalytic activity of Fe3O4/MWCNT/CdS nanocomposites. The VSM analysis results showed that Fe3O4/MWCNT/CdS nanocomposites had high magnetic ability with magnetization saturation of 54 emu.g−1, which results in simple and fast separation of nanocatalyst from media after the treatment process. The dark catalyst activity results showed that Fe3O4/MWCNT/CdS nanocomposites had excellent catalytic activity for the degradation of crystal violet, methylene blue, and rhodamine B dyes from water. The obtained results showed that 100% of crystal violet, 94.2% of methylene blue, and 91.7% of rhodamine B dyes were degraded in 5 min. Based on this research, experimental results confirmed that Fe3O4/MWCNT/CdS magnetic nanocomposites had good potential for the purification of water from pollutant dyes in a simple and fast treatment process.