Study On The Preparation And Photocatalytic Performance Of Metal Phthalocyanine Multiphase Catalysts

With the rapid development of industrialization and urbanization,the problem of water pollution has become more and more prominent in recent years.Especially,the organic pollutants which are difficult to be degraded are discharged into the water body and have serious effects on the ecological environment and the human body.It is difficult to remove it by conventional water treatment method.For this kind of waste water and metal phthalocyanine visible photocatalyst become the hot spot in the world,the metal phthalocyanine compound has strong absorption in the visible region and can be used in practice.Although the metal phthalocyanine is good in chemical stability and excellent performance,its solubility in water is low and it is easy to form dimer.It is difficult to recover.To solve these problems,the most simple and effective method is to immobilize it to the porous carrier,preparating multiphase catalyst.In this paper,five kinds of binuclear hexacarboxyl metal phthalocyanines were synthesized and then supported and bonded to MCM-41.The supported and bonded heterogeneous catalysts were prepared and reacted with H₂O₂ to form a reaction system.In addition,further studies are still required to inspect the reaction mechanisms of many remediation technologiesIn this paper,five kinds of hexacarboxy binuclear metal phthalocyanine BNHCPcM?M=Fe???,Zn???,Ni???,Co???,Cu????were synthesized by solid phase method using trimellitic anhydride and pyromellitic anhydride as precursors.The MCM-41molecular sieve was calcined and activated to remove the template and then silylated with3-aminopropyltrimethoxysilane to obtain modified MCM-41-NH₂;five hexacarbonyl dinuclear metal phthalocyanines were loaded and bonded with MCM-41-NH₂ to obtain supported hexacarbonyl dinuclear metal phthalocyanine and bonded hexacarbonyl dinuclear metal phthalocyanine catalyst.Through elemental analysis,UV-visible Spectroscopy,infrared spectroscopy,X-ray powder diffraction,nitrogen adsorption desorption and scanning electron microscopy.The synthesis of polyphase metal phthalocyanine catalyst was carried out,which retained the uniform pore structure and high catalytic activity.The oxidation of methyl orange wastewater under simulated visible light was affected by the factors such as catalyst dosage,H₂O₂ concentration,pH and influent concentration.Whenthe amount of catalyst was 1.5g/L,the concentration of H₂O₂ was 30mmol/L,pH 5and the influent concentration was 60mg/L,the decolorizationrate of supported hexachlorocarbonylmophthalocyanine catalyst was 92%.When the amount of catalyst was1g/L,H₂O₂ concentration is 30mmol/L,pH 5 and water concentration of 60mg/L,the decolorization rate of the hexagonal carboxylate phthalocyanine catalyst was 96%.under the optimum conditions,The experimental results show that the catalytic activity of cobalt phthalocyanine is the best in the two series of catalysts.The stability test showed that the two kinds of heterogeneous metal phthalocyanine catalysts were highly active after four cycles,and the stability of the bonded catalyst was better than that of the supported type.