عنوان مجله
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CHEMICAL ENGINEERING RESEARCH & DESIGN
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چکیده
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In this study, organic contaminant degradation was intensified by increasing the oxidative
capacity of the reaction system through simultaneous photocatalysis and heterogeneous
persulfate activation. Fe nanoparticles were served as a multifunctional modifier to enhance
the photoactivity of graphitic carbon nitride (CN), by tuning optical properties as well
as persulfate (PS) activation rate, by introducing a new activation pathway. The synthesized photocatalysts were characterized by X-ray diffraction (XRD), Fourier transformed
infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive X-ray
spectroscopy (EDX), transmission electron microscopy (TEM), UV-visible diffuse reflectance
spectroscopy (UV-vis DRS), and photoluminescence (PL) analysis. Oxidation power of the
proposed system was examined by the degradation of Rhodamine B (RhB) as a model pollutant under visible light irradiation. The effect of operating parameters contributing to the
degradation process, including initial pH, and the concentration of the photocatalyst and
potassium persulfate were investigated in detail. Scavenging experiments proved that the
photocatalyst hole and sulfate radicals play a major role in RhB degradation, and a plausible
mechanism for the generation of oxidative species was proposed. Furthermore, reusability tests revealed that the photocatalysts possess excellent stability after three repetitive
experiments.
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