Abstract
Zero-valent iron-modified Degussa P25-TiO2/ZnO nanocomposites (denoted as P25/Fe0/ZnO) were designed and prepared via Fe0 impregnation of P25-TiO2/ZnO and then were employed in the visible-light photocatalytic degradation of p-nitrophenol (PNP) in the presence of [K2S2O8]. Central composite design was applied for response surface modeling (RSM) to understand the influence of selected factors (pH, [Fe0] wt% and [K2S2O8] concentration) on the degradation of PNP and to determine the interaction between the factors. The maximal PNP degradation efficiency (86.9%) was obtained with P25/1.5 wt% Fe0/ZnO at 3 mg/L of [K2S2O8] concentration and pH 7.5. In addition, the RSM showed a satisfactory correlation between the experimental and predicted values of PNP degradation. The P25/Fe0/ZnO photocatalyst performance was also examined degrading methyl orange and phenol and high degradation efficiency, 82 and 99%, was achieved, respectively. The structure, morphology, light absorption and photocatalytic properties of as-prepared P25/Fe0/ZnO were studied using TEM, BET, XRD, FTIR and DRS.
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The authors thank the Razi University Research Council for support of this work.
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Joshaghani, M., Yazdani, D. & Zinatizadeh, A. Statistical modeling of p-nitrophenol degradation using a response surface methodology (RSM) over nano zero-valent iron-modified Degussa P25-TiO2/ZnO photocatalyst with persulfate. J IRAN CHEM SOC 14, 2449–2456 (2017). https://doi.org/10.1007/s13738-017-1179-9
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DOI: https://doi.org/10.1007/s13738-017-1179-9