Abstract
We report a facile sol-gel synthetic method of graphene oxide (GO) embedded ternary heterostructure nanocomposites of N-TiO2/Ag3PO4@GO with different weight ratios of N-TiO2 to Ag3PO4. XRD, Raman spectroscopy, XPS, TEM, DRS, PL studies and BET surface area analysis are employed for characterization which reveals that the nanocomposite can become an excellent photocatalyst. The material is extensively used in photodegradation of Acid Blue 25 dye. The degradation of the dye is influenced by catalyst load, initial concentration, and solution pH and follows modified Langmuir–Hinshelwood model. Among the different nanocomposites, N-TiO2/Ag3PO4@GO(0.6) exhibit superior photoactivity. The highest photo-degradation of 98% is achieved with a catalyst dose of 1.00 g L−1 for an initial dye concentration of 18 μmol L−1 at pH 3 in 20 min of visible-light illumination. The corresponding L-H first order rate constant (k1) value is found to be 17.26 × 10−2 min−1. A possible mechanism relating to the enhanced visible light absorption, substantial separation of photogenerated electron-hole pairs and faster interfacial charge separation between N-TiO2, Ag3PO4 and GO sheets is proposed.
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