In this study, the polyhydroquinone/Fe3O4 (PHQ/Fe3O4) was synthesized
as a heterogeneous
catalyst to activate persulfate to effectively degrade Rhodamine B
(RhB). The synthetic PHQ/Fe3O4 nanoparticles
were characterized using X-ray diffraction (XRD), transmission electron
microscope (TEM), Brunauer–Emmett–Teller (BET) nitrogen
adsorption, and Fourier-transform infrared (FTIR) spectra. PHQ/Fe3O4 shows better catalytic performance and excellent
reusability than PHQ and Fe3O4. The results
indicated that PHQ/Fe3O4 maintains quinone units
and the presence of the quinone moieties successfully accelerates
the degradation compared to Fe3O4, owing to
the role of quinone assisting the redox cycling of Fe. Effects of
PHQ/Fe3O4 addition, persulfate concentration,
pH, and temperature on the degradation efficiency of RhB by persulfate
are examined in batch experiments. Increasing the temperature may
significantly accelerate the RhB degradation, and the degradation
is found to follow the pseudo-first-order kinetic model. On the basis
of these findings, the possible mechanism of RhB degradation was proposed.
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