Facile synthesis of spherical Au/TiO2 nanoparticles by sol-gel method using Tween 80 for photocatalytic decolourization of Malachite Green dye

HSM Abd-Rabboh, M Benaissa… - Materials Research …, 2018 - iopscience.iop.org
HSM Abd-Rabboh, M Benaissa, MA Ahmed, KF Fawy, MS Hamdy
Materials Research Express, 2018iopscience.iop.org
The current study demonstrated the successful photocatalytic decolourization of malachite
green (MG) dye over novel spherical TiO 2 nanocomposites embedding with 0–1 wt% of Au
nanoparticles. Au/TiO 2 nanocomposites were prepared by using sol-gel method and Tween
80 as a template. A shift in solution color from yellow to dark purple color was spontaneously
detected after addition of Tween 80 revealing the reduction of Au ions into metallic Au
nanoparticles. The structural, crystalline and morphological features of the samples were …
Abstract
The current study demonstrated the successful photocatalytic decolourization of malachite green (MG) dye over novel spherical TiO 2 nanocomposites embedding with 0–1 wt% of Au nanoparticles. Au/TiO 2 nanocomposites were prepared by using sol-gel method and Tween 80 as a template. A shift in solution color from yellow to dark purple color was spontaneously detected after addition of Tween 80 revealing the reduction of Au ions into metallic Au nanoparticles. The structural, crystalline and morphological features of the samples were characterized using X-ray diffraction, XRD, Field emission scanning electron microscopy, FESEM, together with energy-dispersive X-ray spectroscopy, EDX, and Fourier transform infra-red spectroscopy, FTIR,. The obtained characterization results indicate that the existence of Au nanoparticles control the growth of titania crystallites and reduce the crystallite size to nano dimensions. The photocatalytic reactivity of Au/TiO 2 was found to be highly effected in the presence SnO 2 as a co-dopant with Au. DR UV-Vis study showed the disappearance of surface plasmon absorption in the presence of SnO 2.
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