Insights into the Glyphosate Adsorption Behavior and Mechanism by a MnFe₂O₄@Cellulose-Activated Carbon Magnetic Hybrid

Abstract

To enhance the removal of the negatively charged organophosphorus pesticide (OPP) glyphosate (GLY), we prepared a positively charged MnFe2O4@cellulose activated carbon (CAC) hybrid by immobilizing MnFe2O4 nanoparticles on the CAC surface via a simple one-pot solvothermal method, scanning electron microscopy, BET, transmission electron microscopy, IR, Raman, X-ray diffraction, and X-ray photoelectron spectroscopy analysis which proved the successful synthesis of MnFe2O4 with a particle size of 100–300 nm. The particles were distributed on the surface of CAC to form the MnFe2O4@CAC hybrid. MnFe2O4@CAC exhibited a positive charge at pH below 6 and had good magnetic properties and dispersion stability. The maximum GLY adsorption capacity of MnFe2O4@CAC (167.2 mg/g) was much higher than that of CAC (61.44 mg/g) and MnFe2O4 nanoparticles (93.48 mg/g). The adsorption process was dominated by chemisorption, and the formation of new chemical bonds between GLY and MnFe2O4 was confirmed by simulations. The newly formed chemical bonds were attributed to the conjugation between p electrons of the adsorbent and the d electrons of the adsorbate. Collectively, the results indicate that the as-prepared MnFe2O4@CAC is promising for anionic pollutant adsorption and the removal of OPPs, and our mechanistic results are of guiding significance in environmental cleanup.

Removal of Tetracycline, 2,4-Dichlorophenol, and Glyphosate from Aqueous Solution by Novel Humic Acid-Modified g-C3N4-Supported Hydrotalcite-like Compounds: Kinetics, Isotherm, Thermodynamics, and Reusability Exploration

“…The pore structure of g-C 3 N 4 @HTLcs/HA100 is not easy to be blocked by the adsorbate because it contains a cross-linked pore structure and a typical layered structure. Moreover, compared to the adsorbents from previous studies, − the as-obtained g-C 3 N 4 @HTLcs/HA100 showed a great performance of TL, DP, and GH adsorption (Table ). The g-C 3 N 4 @HTLcs/HA100 composites could be easily regenerated by desorption of the organics.…”

Magnetic properties and structural analysis on spinel MnFe2O4 nanoparticles prepared via non‐aqueous microwave synthesis

“…[74,75] The formation of FeÀ O and MnÀ O bonds is further confirmed by the bands at 741 and 489 cm À 1 . [76] The removal of organics on the particle surface can be achieved by a subsequent thermal treatment at 400 °C or higher, but calcination at 600 and 800 °C results in the decomposition of the spinel-type structure.…”

Improved Removal of Cr(VI) using Fe3O4/C Magnetic Nanocomposites Derived from Potassium Fulvic Acid

“…The XPS spectra of O1s in Figure c contains three peaks (533.4, 531.7 and 530.3 eV) belonging to C−O, ‐OH and Fe−O, respectively . The relative contents of the above three peaks are 21.55%, 32.56% and 45.89% before adsorption.…”