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.
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