Synthesis And Photocatalytic Activity Of Replaced Phthalocyanine/SnO₂Composite Material

SnO₂is a kind of important semiconductor materia, which is believed to be importantphotocatalyst for its good optical steability and no toxicity. But it is not facilitate towidespread for the deficiencies such as large band gap and weak photocatalytic activity.Because of intensively absorbing visible light, metal phthalocyanine （MPc） is used to besensitizer early. It is expected to be more excellent performance of the photocatalyticmaterials, if is used for the sensitization of SnO₂.At present, the replaced metal phthalocyanine as a photosensitive agents in the synthesisand properties is less studied, as the special properties of phthalocyanine （solubility goodpreparation, relatively simple, etc）. First, nucleophilic substitution was completed respectivelyfor preparation precursor body between the five chlorine phenol, alpha-naphthol, phenol,heptanol,8-hydroxyquinoline and4-nitro-dicyanobenzens, the next five different kinds ofcomposite materials were synthesized in-situ through four gather reaction with adjacent4-nitro-dicyanobenzens on the surface of SnO₂naoparticles while SnO₂gel base has beenformed with Co（Ⅱ） as template, each composite material was prepared different molar ratios,the prepared products were characterized by means of UV-Vis、IR、XRD and TG-DSCmethods, and the photocatalytic activity of the prepared products were investigated by usingphotocatalytic degradation of Rodanming B in visible light as a model reaction．The experimental results indicate that the UV-Vis spectrum of the production bringsabout moving to long wavelength in its characteristic absorption Q belt; the vibrationabsorption peaks of M-O appreared in IR spectrum, the size of crystal particals have becomesmaller than before, all that show in the different substituents phthalocyanine cobalt CoPc andSnO₂were linked with partial chemical bond; in the curve of TG-DSC analysis, the stabilityof composite materials can be improved by means of in-situ.In visible degradation experiments, compared with the pure SnO₂, the degradation rateof composite materials is highly raised via broading the scope of the of SnO₂and thedegradation rate of Rh B of8mol%CoPc(β-OC₁₂H₇)₄/SnO₂is up to89.2%more higher thanothers in2.5h, which has the best application prospect.The experiment on photocatalytic stability indicated that the light catalytic activity of4mol%CoPc（β-OC₆Cl₅）₄/SnO₂is stable without toxicosis and inactivation. The bondformation between CoPc（β-OC₆Cl₅）₄and SnO₂is relatively stable.