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Abstract
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Carbon-doped g-C3N4 (CGNS) nanocomposite with Ag2O and α-Fe2O3 has
been synthesized to improve g-C3N4 photocatalytic activity. The prepared
CGNS/Ag2O/α-Fe2O3 (GAF [with mass ratio 3:2:1]) nanocomposite exhibits
the expanded visible-light absorption region leading to the enhanced photocatalytic
performance for Acid Red 14 (AR14) degradation. Besides, it is
found that the recombination rate of the charge carriers effectively suppresses
the nanocomposite. For a better understanding of the photocatalytic
degradation mechanism, the reactions have been performed in the presence
of different scavengers. The experiments indicate that superoxide anion radicals
possess a more influential role in AR14 degradation in comparison
with hydroxyl radicals and holes. The degradation efficiency has been
decreased from 94.68 to 85.60 after five consecutive photocatalytic tests
implying that the prepared nanocomposite is a stable photocatalyst. In the
end, the kinetic study of AR14 degradation on nanocomposite with considering
pseudo-first-order kinetics results in a nonlinear empirical kinetic
model development for prediction of degradation efficiency of AR14 on
nanocomposite.
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