Synergistic Catalytic Oxidation Of Dves Using Ordered Mesooorous Carbon Supported Metallo Phthalocvanine

As we all known, water resource is one of the most important elements of people’s survivals,social and economic development. However, with the development of industrialization andurbanization, our world is facing a serious problem of water shortages and water pollution. Theprocesses of textile, printing and dyeing produce a large number of wastewater which have ahigh COD and chromic, and are common sources of water pollution. The conventional treatmenttechnologies widely used in industry for eliminating dyes include physical, chemical andbiological methods. However, the physical methods simply transfer dyes and other organicpollutants from solution to adsorbents, and can not completely eliminate them. The biologicaltreatments subject to certain limitations because of the biological toxicity of dyes orintermediates. Advanced oxidation methods （AOPs） generate strong oxidizing active species anddemonstrate its unique advantages to deal with these problem, while some of AOPs need moreenergy and harsh reaction conditions. Based on the characteristics of the dyeing wastewater andthe severe situation of water resources, to develop the green and efficent methods for treatingdyeing wastewater have an important significance on the conservation of water resources.Metalphthalocyanine derivatives （MPcs） are compounds with large ring of18π electron,having analogous structure to the metalporphyrin and have been extensively studied as catalystsfor a variety of applications in many fields. We note that some inorganic material supportedmetalphthalocyanine, such as carbon material and zeolite, could effectively improve the catalyticactivity. Here, a novel supported metalphthalocyanine was prepared by immobilizing cobalttetraaminophthalocyanine （CoTAPc） on the ordered mesoporous carbon （OMC） covalently. Theexcellent electrical performance and orderly open pore of OMC could enhance the activities ofMPcs and provide the transport channel for the oxidative product of pollutants, finallypreventing the inactivation of catalysts.In this study, we used carboxylic acid-functionalized OMC to attach CoTAPc and R-groupby amide bonds and obtained two new catalysts（CoTAPc-OMC and CoTAPc-OMC-LQ）, whichwere characterized by UV-vis, FTIR-ATR, TGA, TEM, XRD, and so on. These results showedthat the CoTAPc and R-group had successfully loaded on the OMC. In the CoTAPc-OMC system, the catalytic performance of CoTAPc-OMC was studied bythe oxidation of Acid Red G （AR1）. We found that this system has good catalytic performanceon the catalytic oxidation of AR1. The effects of initial concentration of H₂O₂, pH andtemperature and other conditions were investigated. The results indicated that the decomposedrate of AR1increased with the raising H₂O₂concentration. With the increace of pH andtemperature, the catalytic activity was improved. The activation energy has been estimated to be61.87kJ/mol. Repetitive tests showed that CoTAPc-OMC could maintain high catalytic activityover several cycles.In the CoTAPc-OMC-LQ system, we also choose AR1as the target compound. The studiesindicated that CoTAPc-OMC-LQ system has a high catalytic performance in the presence ofNaCl. The effect of various factors on the catalytic activity showed that CoTAPc-OMC-LQ has awidely pH scope. The study found that the catalytic reaction is also consistent with a kineticequation by Allen Niwu Adams formula, and the catalytic reaction activation energy was48.22kJ/mol, reducing13.65kJ/mol than the CoTAPc-OMC catalytic system. After cycling six times,CoTAPc-OMC-LQ also has a high activity. EPR spin-trap technique results showed that thehydroxyl radical is not the major intermediate of these two catalytic systems.