Abstract
Ag-ZnO/PANI nanocomposite was prepared via the sol-gel technique following in situ oxidative polymerization of polyaniline (PANI). XRD, UV-Vis, and FT-IR spectroscopy were employed to study the crystal size, bandgap energy, and bond structure of as-synthesized nanocomposites. The mean crystallite size of the nanocomposite determined from XRD was 35.68 nm. Photocatalytic degradation of malachite green (MG) dye using as-synthesized photocatalysts was studied under visible light irradiation. The highest degradation efficiency was recorded for Ag-ZnO/PANI nanocomposites (98.58%) than Ag-ZnO nanoparticles (88.23%) in 120 min. The kinetics of photocatalytic degradation of MG follows pseudo-first-order reaction with rate order of 1.16 10−2 min−1. Moreover, the photocatalytic activity of Ag-ZnO/PANI nanocomposites was evaluated and compared with Ce-Cd oxide, electrospun P(3HB)-TiO2, and with other catalysts in the literature. The optimal conditions for photocatalytic degradation are as follows: the concentration of malachite green (0.2 g/l), pH (8), and the concentration of catalyst load (0.2 g/l) under visible light with an irradiation time of 120 min.
Highlights
Malachite green (MG) is an organic compound that has arisen as a dubious agent in hydroponics in aquaculture, and it is utilized as a dyestuff for coloring materials such as cotton silk, paper, wool, and leather [1]
To the best of our knowledge, there is no study in the literature that investigates the reaction kinetics of photocatalytic degradation of malachite green using polyaniline/ Ag-ZnO nanocomposite to improve optical and photocatalytic performance. us, this research was deliberated to synthesize the photocatalysts by incorporating Ag and PANI comodified ZnO nanoparticles and discovering the optical properties and kinetics of the photocatalytic activity under visible light irradiation for the degradation and decolorization of MG dye
X-Ray Diffraction Analysis. e average crystallite size (d) was calculated from the XRD pattern according to the Scherrer equation [31]: d kλ, βcosθ where k is a constant, λ is the wavelength (0.15405 nm), β is the full width at half maximum (FWHM) of the diffraction line, and θ is the diffraction angle. e XRD patterns of Ag-doped ZnO nanoparticles showed the crystalline peaks at diffraction angles 2θ 31.79, 34.44, 36.27, 47.55, 62.87, 67.97, and 69.11o for the diffraction plane from (100), (002), (101), (102), (110), (103), (112), and (201), respectively, and XRD result shows the typical peak patterns of Ag-ZnO nanoparticles were wurtzite structure (Figure 2(a))
Summary
Malachite green (MG) is an organic compound that has arisen as a dubious agent in hydroponics in aquaculture, and it is utilized as a dyestuff for coloring materials such as cotton silk, paper, wool, and leather [1]. E produced electron/hole pair incites a complex arrangement of reactions that can bring about the total degradation of Journal of Chemistry organic contaminants, for example, a dye adsorbed on the semiconductor surface [14, 15] In such a manner, the use of photocatalysis gives off an impression of being a really engaging methodology for the decomposition of poisonous mixtures (toxic compounds) to nonhazardous products [2,3,4,5,6,7,8, 16,17,18]. Us, this research was deliberated to synthesize the photocatalysts by incorporating Ag and PANI comodified ZnO nanoparticles and discovering the optical properties and kinetics of the photocatalytic activity under visible light irradiation for the degradation and decolorization of MG dye To the best of our knowledge, there is no study in the literature that investigates the reaction kinetics of photocatalytic degradation of malachite green using polyaniline/ Ag-ZnO nanocomposite to improve optical and photocatalytic performance. us, this research was deliberated to synthesize the photocatalysts by incorporating Ag and PANI comodified ZnO nanoparticles and discovering the optical properties and kinetics of the photocatalytic activity under visible light irradiation for the degradation and decolorization of MG dye
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