The Study Of Visible Light-driven Selective Oxidation Of Aromatic Alcohols And Selective Hydrogenation Of Unsaturated Aldehyde

In this work,we report a facile and bioinspired synthesis of mesoporous indium sulfide nanoparticles with flowerlike structures controlled by amino acids.During the synthesis procedure,indium sulfide precipitate was prepared by a simple solvothermal method with different amino acids as the directing and assembling agent.The resulted photocatalyst was characterized by X-ray powder diffraction?XRD?,scanning electron microscopy?SEM?,UV-vis diffuse reflection spectroscopy?DRS?,transmission electron microscopy?TEM?,Brunauer-EmmettTeller?BET?specific surface area,electron spin resonance?ESR?and X-ray photoelectron spectroscopy?XPS?.Depending on different amino acids as the crystallization modifiers,the indium sulfide samples exhibit different morphologies.The photocatalytic test of selective oxidation of aromatic alcohols to aromatic aldehydes under visible light irradiation shows that indium sulfide nanoparticles synthesized with addition of amino acids exhibit an increased photoactivity than that of In₂S₃ nanocatalyst without amino acids,which can be attributed to both the relative high BET surface area and effective separation of photogenerated charge carriers.The effect of various radical scavengers is also investigated.Moreover,the facile solvothermal approach by the introduction of amino acid with a suitable combination of functional groups,such as –NH2 and –COOH,presents a means of achieving well ordered nanomaterials in a cost-effective and scalable manner.In the exploration of other synthetic conditions of In₂S₃,different sulfur sources have different effects on the growth of In₂S₃.The samples obtained after addtion L-Cysteine were poor in crystallinity.The photoactivity of as synthesized samples under the conditions of TU?thiourea?and TAA?thioacetamide?was slightly improved.Increasing the concentration of sulfur ions also has a significant effect on the synthesis of In₂S₃.Exploring the appropriate In/S ratio is critical to the synthesis of indium sulfide.Pt/RGO catalysts were prepared by chemical reduction method.By using ethylene glycol as solvent and reducing agent,GO and Pt were reduced at the same time by solvothermal method,so that Pt was uniformly dispersed on the surface of RGO.And the size of Pt particles obtained by this synthesis method was relatively uniform.In the reaction of selective hydrogenation of cinnamaldehyde,it was found that the catalyst modified by the metal Pt modifier had a high conversion rate,which may be due to the weakening of the C=O bond due to the addition of Pt particles.This reaction is rarely reported in the field of photocatalysis,more experimental conditions and reaction mechanism remains to be further studied.