Mono-Substituted Molybdenium Preyssler Heteropolyacid: An Eco-Friendly Photocatalyst for the Synthesis of Gold Nanoparticles in Solution and Titanium Dioxide Surface with Excellent Photoactivity in Combination with Titanium Dioxide
Fatemeh F. Bamoharram, Saideh Kadkhodaei, Ali Ayati, Javad Baharara and Majid M. HeraviAffiliation:
Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran.
AbstractGold nanoparticles were synthesized using a straightforward photoreduction procedure in the presence of mixed-addenda Preyssler heteropolyacid, H14[NaP5W29MoO110], (PMo), in which it acts as a reducing agent, as well as a photocatalyst and stabilizing agent. The obtained results showed that the construction rate, morphology and the size of the gold nanoparticles strongly depends on the volume of propan-2-ol amount used as solvent. The shapes of the synthesized gold nanoparticles in the low volume of the solvent were almost uniform spheres with the size of 40-60 nm. The morphologies of the gold nanoparticles in higher volume of the aforementioned solvent were found to involve a mixture of triangular, tubular, pentagonal and hexagonal structures along with spheres in range of 5-30 nm. Besides, the ability of the PMo as reducing agent for the synthesis of gold nanoparticles onto the surface of TiO2 via photochemical technique was investigated. The results showed that, PMo as a reducing catalytic linker could be bind onto titanium dioxide to synthesis the desired gold nanoparticles. The synthesized gold nanoparticles and nanocomposites were characterized by TEM, XRD, SEM, UV and FTIR techniques.The photocatalytic activity of the synthesized nanocomposite was measured by photodegradation of the organic dye “malachite green” under UV-Vis light and was found being excellent.
Mixed-addenda Preyssler, heteropolyacid, nanocomposite, gold nanoparticles, photocatalyst, titanium dioxide
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