Study On Preparation And Catalytic Properties Of Phthalocyanine/SiO₂Composite Macroporous Materials

A new type of SiO2macroporous material was prepared by using a three dimensional skeletalpolymer as template, which was used to obtain the metal phthalocyanine/silicacompositemacroporous materials (Co(II)-taPc/SiO2, Fe(Ш)-taPc/SiO2) by loading the metal phthalocyanine.And the catalytic properties of Co(II)-taPc/SiO2, Fe(Ш)-taPc/SiO2are studied. The specificresearch methods and achievements are as follows:A new type of SiO2macroporous material was prepared by using a three dimensional skeletalpolymer with an epoxy resin matrix as template through the in situ sol-gel course of ethyl silicateand the high temperature sintering. This material shows three dimensional ultrathin structure, andits pore structure is of three-dimensional continuum with the pore sizes in a range of1-2m, theporosity above90%, the apparent density less than0.2g·cm-3and the specific surface area over130m2·g-1. This new template method for the Preparation of macroporous materials avoid theproblem of inorganic filling up, making it possible to thepreparation of large size complex shapesof macroporous materials.Co(II)-taPc/SiO2and Fe(Ш)-taPc/SiO2compond macroporous materials were obtained byusing macroporous SiO2as carrier, and loading on Co(II)-taPc and Fe(Ш)-taPc via a simpleimmersing/solvent exchanging method. The two macroporous catalysts were characterized bymeans of SEM, HRTEM, UV-Vis diffuse reflectance spectrometry and Raman spectrometry. Theresults showed that the Co(II)-taPc molecules dispersed very well on the wall of the SiO2support,and mainly existed in the form of monomer with good dispersion and high stability.In the catalytic oxidation of2-mercaptoethanol trials，we studyed the catalyst performanceof the Co(II)-taPc/SiO2by following the tracks of oxygen consumption rate. The results showedthat the Co(II)-taPc/SiO2catalysts exhibited similar properties as an mimic enzyme, judged fromthe Michaelis-Menten equation that the dynamics followed. A gradually increasing catalyticactivity was observed as the content of Co(II)-taPc increased from0.7%to3.6%, the rmaxof3.6%Co(II)-taPc/SiO2is3.85mL·min-1and the Kmis0.113mol·L-1. The catalysts showed good stabilityand high reuse rate, and their catalytic activity was not affected barely after10times of cyclingutilization. The photocatalytic activity and circulating degradation rate of the Fe(Ш)-taPc/SiO2catalystswere determined by using rhodamine B as the objective substance. The results showed that rapiddegradation of rhodamine B was observed under the radiation of visible light. The degradatereaction followed first order kinetics equation. Its catalytic activity enhanced with the increase ofthe load. And the highest degradation rate was up to97.4%within1h of reaction. The catalystsexhibited activities changed very slightly during6times of cycling utilization.