Organic pollutants discharged from industries contribute to severe water pollution. To enhance the removal of the negatively charged Allura red (E129) dye, we prepared a positively charged novel guanidine-cellulose@manganese ferrite (GC@MnFe2O4) nanocomposite that was thoroughly characterized using various techniques such as elemental analysis, Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray Spectroscopy (EDX), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Brunauer–Emmett–Teller (surface area analysis) (BET) and Vibrating Sample Magnetometry (VSM). GC@MnFe2O4 was employed in the adsorption of Allura red (E129) dye. Response surface methodology (RSM) with Box Behnken Design (BBD) was employed to fine-tune the reaction parameters in order to optimize the adsorption process. A maximum adsorption capacity, for E129, was achieved under the optimal conditions for 10 ml of dye are pH 2.03, E129 concentration of 48.66 mg L−1, with an adsorbent dosage of 10.33 mg, after at contact time of 15 min, and temperature of 298 K. The spent GC@MnFe2O4 can be regenerated and reused efficiently for up to five adsorption cycles. The adsorption kinetic of E129 dye fitted the Elovich model indicating a rapid initiation of adsorption, which is unusual and suggests a strong affinity between the adsorbate and the adsorbent surface due to extremely high ae indicates that adsorption begins very rapidly, which is uncommon and may indicate a very high affinity between the adsorbate and the adsorbent surface. Additionally, due to magnetic properties, the GC@MnFe2O4 rapid collection within 20–30 s by Nd52 magnet and the Langmuir isotherm model best described the adsorption of E129 dye, with maximum adsorption capacities qe of 21.1 mg g−1 at 298 K. While, the thermodynamic analysis revealed that the adsorption of E129 dye onto GC@MnFe2O4 is a spontaneous exothermic process.The prepared GC@MnFe2O4 was also effectively used to remove E129 dye from actual water samples and synthetic effluents, achieving a recovery rate (R%) exceeding 98%.Ultimately, this study demonstrates that the fast-responsive GC@MnFe2O4 can be effectively utilized to eliminate E129 dye from a wide range of real water sources. Collectively, the results indicate that the as-prepared GC@MnFe2O4 is promising for anionic pollutant adsorption and the removal of anionic dyes, and our mechanistic results are of guiding significance in environmental cleanup. This work contributes significantly to understanding how experimental conditions influence the mechanism of dye adsorption by GC@MnFe2O4, offering valuable and new insights for future applications and optimizations in the treatment of effluent-containing dyes.

Aminated cellulose doped magnetic manganese ferrite (GC@MnFe₂O₄) nanocomposite for removal of Allura Red dye from wastewater: RSM optimization

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2026年5月28日

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Magda A. Akl,
Abdelrahman S. El-Zeny,
El-Sayed R. El-Gharkawy,
Tarek A. Gad-Allah

摘要

Organic pollutants discharged from industries contribute to severe water pollution. To enhance the removal of the negatively charged Allura red (E129) dye, we prepared a positively charged novel guanidine-cellulose@manganese ferrite (GC@MnFe₂O₄) nanocomposite that was thoroughly characterized using various techniques such as elemental analysis, Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray Spectroscopy (EDX), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Brunauer–Emmett–Teller (surface area analysis) (BET) and Vibrating Sample Magnetometry (VSM). GC@MnFe₂O₄ was employed in the adsorption of Allura red (E129) dye. Response surface methodology (RSM) with Box Behnken Design (BBD) was employed to fine-tune the reaction parameters in order to optimize the adsorption process. A maximum adsorption capacity, for E129, was achieved under the optimal conditions for 10 ml of dye are pH 2.03, E129 concentration of 48.66 mg L⁻¹, with an adsorbent dosage of 10.33 mg, after at contact time of 15 min, and temperature of 298 K. The spent GC@MnFe₂O₄ can be regenerated and reused efficiently for up to five adsorption cycles. The adsorption kinetic of E129 dye fitted the Elovich model indicating a rapid initiation of adsorption, which is unusual and suggests a strong affinity between the adsorbate and the adsorbent surface due to extremely high a_e indicates that adsorption begins very rapidly, which is uncommon and may indicate a very high affinity between the adsorbate and the adsorbent surface. Additionally, due to magnetic properties, the GC@MnFe₂O₄ rapid collection within 20–30 s by Nd52 magnet and the Langmuir isotherm model best described the adsorption of E129 dye, with maximum adsorption capacities q_e of 21.1 mg g⁻¹ at 298 K. While, the thermodynamic analysis revealed that the adsorption of E129 dye onto GC@MnFe₂O₄ is a spontaneous exothermic process.

The prepared GC@MnFe₂O₄ was also effectively used to remove E129 dye from actual water samples and synthetic effluents, achieving a recovery rate (R%) exceeding 98%.

Ultimately, this study demonstrates that the fast-responsive GC@MnFe₂O₄ can be effectively utilized to eliminate E129 dye from a wide range of real water sources. Collectively, the results indicate that the as-prepared GC@MnFe₂O₄ is promising for anionic pollutant adsorption and the removal of anionic dyes, and our mechanistic results are of guiding significance in environmental cleanup. This work contributes significantly to understanding how experimental conditions influence the mechanism of dye adsorption by GC@MnFe₂O₄, offering valuable and new insights for future applications and optimizations in the treatment of effluent-containing dyes.

Aminated cellulose doped magnetic manganese ferrite (GC@MnFe2O4) nanocomposite for removal of Allura Red dye from wastewater: RSM optimization

摘要

Aminated cellulose doped magnetic manganese ferrite (GC@MnFe₂O₄) nanocomposite for removal of Allura Red dye from wastewater: RSM optimization