Novel Substituted Subphthalocyanine:Synthesis Characterization And Photo-catalytic Activity Of Their TiO₂-base Composites

Since the first subphthalocyanine(SubPc)was synthesized in 1974,it has attracted considerable attention and been widely studied by researchers for its excellent chemical stability and light,electric and magnetic properties.As a low conjugate homologue of phthalocyanine compounds,which have been widely used in photocatalytic degradation,SubPc has the potential for utilization in this field because of its modifiable structure and its unique spatial configuration.At the same time,since TiO2 was first found to be able to degrade water under ultraviolet light in 1972,it is widely used in the field of photocatalytic degradation of organic pollutants due to the fact that it is chemically stable,recyclable,low in price,easy to prepare,environmentally friendly,nontoxic and has high photocatalytic activity.A wide photovoltaic response band of SubPc is loaded on TiO2 with excellent photocatalytic activity,and it is prepared to obtain "organic-inorganic" photosensitive catalyst.For the first time,this powerful combination of photocatalyst was applied to the photocatalytic degradation of organic matter in wastewater.Through experimental analysis,it was found that methyl orange and bromophenol blue in aqueous solution have better degradation effect.This research innovatively applies SubPcs to this field,synthesizes a series of SubPc compounds,uses them as photosensitizers,synthesizes SubPc-TiO2 photosensitive catalysts,degradates methyl orange and bromophenol blue in aqueous solution under visible light conditions,discusses the effect of the amount and the structure of subphthalocyanine on the catalysis,and sums up the influence law to provide basis and enlightenment for its further development.The main research contents of this paper are as follows:a.Two series of 18 new SubPc compounds were synthesized,and characterized by IR,UV and elemental analysis.b.The 18 kinds of SubPc compounds were prepared by monocrystalline culture,and 6 kinds of SubPc single crystals were cultured,and their structure was confirmed by XRD.Five of them are not reported in the new structure,and found a new solid phase accumulation model of SubPc and a carboxyl group and the SubPc axial bonding of the SubPc compoundsc.Photosensitized catalysts were prepared from 6 kinds of subphthalocyanine compounds grown from single crystals and TiO2.By analyzing their degradation effects on methyl orange and bromophenol blue and combining relevant characterizations,it was found that the amount and axial ligands of SubPc influence the catalytic effect of the photosensitive catalyst.d.According to the different amount and the different axial functional groups of SubPc compounds,combined photocatalytic effect to analysis and summary of the reasons,to provide further ideas and lessons for the further study of SubPc-TiO2 p hotosensitive catalystse.Search for related literature,combined with photocatalytic performance test results,propose a preliminary photocatalytic degradation mechanism.