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<p>In the present study the novel Fe<sub>3</sub>O<sub>4</sub>/MWCNT/CdSe magnetic nanocomposites were synthesized using a straightforward refluxing technique and applied as a dark catalyst for the degradation of methylene blue (MB) in wastewater. Various characterization techniques, including XRD, Raman and FTIR confirmed that Fe<sub>3</sub>O<sub>4</sub>/MWCNT/CdSe nanocomposites were successfully synthesized. The mechanism and rate of degradation for the removal of MB from aqueous solution were investigated. The effect of catalyst mass, reusability and other operating parameters, including pH, on degradation were thoroughly investigated. The degradation kinetics followed a pseudo–first order model. The rate constant k and correlation coefficient R<sup>2</sup> values were determined to be 3.34&#xa0;min<sup>−1</sup> and 0.98 respectively. The average particle size of the loaded CdSe and Fe<sub>3</sub>O<sub>4</sub> quantum dots (QDs) were estimated to be approximately 12 and 14&#xa0;nm respectively. Zeta potential analysis revealed that the negative charge on the surface of Fe<sub>3</sub>O<sub>4</sub>/MWCNT/CdSe nanocomposites is about 17.45&#xa0;mV, which is slightly increased compared to the Fe<sub>3</sub>O<sub>4</sub>/CdSe composite. BET results exhibited an effective surface area of 204.01 m<sup>2</sup>g<sup>−1</sup> with a pore volume of 0.367 cm<sup>3</sup>g<sup>−1</sup>, also the average pore diameter obtained from BJH analysis was 7.2&#xa0;nm. The degradation of MB was carried out using Fe<sub>3</sub>O<sub>4</sub>/MWCNT/CdSe nanocomposites as a dark catalyst. It was found to be from absorption spectrum that MB degraded completely after 90&#xa0;s of stirring in the absence of light within a pH range of 7–14. The morphology and structure of the synthesized novel nanocomposite was studied by various characterization techniques. The FESEM and Mapping analysis showed that multi-walled carbon nanotubes (MWCNTs) matrix are well decorated with the CdSe and Fe<sub>3</sub>O<sub>4</sub> QDs. VSM analysis revealed excellent superparamagnetic behavior of the formed nanocomposites with a saturation magnetization of 38&#xa0;emu/g. This allows the nanocatalysts were easily separated by the magnet from the effluent after the dye is degraded. Also the radical scavenger exprement confirmed that electrons play a decisive role in the degradation process.</p>

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An effective and novel magnetic dark catalyst based on Fe3O4/MWCNT/CdSe for ultrafast removing of methylene blue from aqueous solutions

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Afrasiab Salehi Moghanlou,
  • Mehdi Molaei,
  • Tao Fang

摘要

In the present study the novel Fe3O4/MWCNT/CdSe magnetic nanocomposites were synthesized using a straightforward refluxing technique and applied as a dark catalyst for the degradation of methylene blue (MB) in wastewater. Various characterization techniques, including XRD, Raman and FTIR confirmed that Fe3O4/MWCNT/CdSe nanocomposites were successfully synthesized. The mechanism and rate of degradation for the removal of MB from aqueous solution were investigated. The effect of catalyst mass, reusability and other operating parameters, including pH, on degradation were thoroughly investigated. The degradation kinetics followed a pseudo–first order model. The rate constant k and correlation coefficient R2 values were determined to be 3.34 min−1 and 0.98 respectively. The average particle size of the loaded CdSe and Fe3O4 quantum dots (QDs) were estimated to be approximately 12 and 14 nm respectively. Zeta potential analysis revealed that the negative charge on the surface of Fe3O4/MWCNT/CdSe nanocomposites is about 17.45 mV, which is slightly increased compared to the Fe3O4/CdSe composite. BET results exhibited an effective surface area of 204.01 m2g−1 with a pore volume of 0.367 cm3g−1, also the average pore diameter obtained from BJH analysis was 7.2 nm. The degradation of MB was carried out using Fe3O4/MWCNT/CdSe nanocomposites as a dark catalyst. It was found to be from absorption spectrum that MB degraded completely after 90 s of stirring in the absence of light within a pH range of 7–14. The morphology and structure of the synthesized novel nanocomposite was studied by various characterization techniques. The FESEM and Mapping analysis showed that multi-walled carbon nanotubes (MWCNTs) matrix are well decorated with the CdSe and Fe3O4 QDs. VSM analysis revealed excellent superparamagnetic behavior of the formed nanocomposites with a saturation magnetization of 38 emu/g. This allows the nanocatalysts were easily separated by the magnet from the effluent after the dye is degraded. Also the radical scavenger exprement confirmed that electrons play a decisive role in the degradation process.