Synthesis Of Organic-inorganic Photosensitive Compounds And Their Applications For Photocatalytic Hydrogen Production

Four organic-inorganic photosensitive compounds [Ru(bpy)2L](PF6)2(L=L1-L4) were obtained by introducing triphenylamine and rhodamine6G into Ruthenium complexes in this paper, and they were used for sensitizing Pt/TiO2to produce hydrogen under irradiation visible light(λ>420nm).1. Four organic-inorganic photosensitive compounds [Ru(bpy)2L](PF6)2(PS1-4) were synthesized by RuCl3, phenanthroline, triphenylamine and rhodamine6G. Elemental analysis,’H NMR, MS and UV-Vis were used to characterize the products.2. Ethanol (C2H5OH) and chloroplatinic acid (H2PtCl6·6H2O) were used as a sacrificial electron donor and a precursor of Pt deposition by photoreduction deposition method on TiO2, respectively. Photosensitive compounds PS1-4were utilized to prepare the composite photocatalysts PS/Pt/TiO2, which were characterized by XRD, TEM and UV-Vis DRS. The results showed that the crystal form of TiO2in the catalysts of TiO2, Pt/TiO2and PS/Pt/TiO2was anatase; The Pt particles were uniformly deposited onto TiO2, and the absorption spectra of TiO2could be expanded to visible region by dye sensitization.3. PS/Pt/TiO2were studied as photocatalysts for hydrogen production under irradiation of a300W xenon lamp. The influences of photosensitive compounds’ structures and amounts, amount of photocatalysts, different kinds of sacrificial agents, amount of TEOA and pH value of solution on the amount of hydrogen production were investigated. It had been found that PS1was the most efficient photosensitive compound for0.5wt%Pt/TiO2, and when the content of photocstalyst, photosensitive compound of PS1and TEOA were50mg,5%,5%(V:V) at pH11, the amount of hydrogen could reach an maximum of9500μmol/g in5h.