The Synthesis And Properties Of Organic-inorganic Hybrid Molecules: Cyclotriphosphazenes

Environmental pollution control and governance is a problem that the worldgenerally faced and should be solved urgently in today. Selecting and developing highefficiency, environmental protection and economic catalyst for the degradation ofpollutants, has become the top priority of environmental pollution. In recent years,scholars did sophisticated researches on semiconducting metal oxides, prepareddifferent types and morphologies of the catalyst, and on the effect of light, it achievedgood photocatalytic degradation positive effect. Common metal oxides include: ZnO,CuO, WO₃and SnO₂. The most widely studied metal oxide is the TiO₂, it is the starmolecule in the domain of photocatalysis. In addition to the above-mentioned catalyst,other types of catalyst, such as plasma photocatalyst, graphene semiconductor catalyst,as well as the Carbon Nitride （C₃N₄）, are also sought after by the field of study. TheC₃N₄is a new type of material, it is because it involves only the C and N and is a purenon-metallic catalysts that make it become a Hot Research Topic.results show that cross-linked product, with a large specific surface area, andcross-linked product class coral-like spatial structure and processes, which provides anecessary prerequisite for being a catalyst. TEM results show the synthesis ofcross-linked product pieces like the film.This paper to the hexachlorocyclotriphosphazen as the core, preparescyclotriphosphazene containing different ratios of tetrazole and oxadiazole functionalgroups covalently cross-linked derivatives, determines its structure by infrared analysis（FT-IR） and X-ray photoelectron spectroscopy analysis（XPS）, analyzes the morphologyof the synthesized catalyst by using scanning electron microscopy （SEM） andtransmission electron microscopy （TEM）, study the thermal stability of the catalyst byusing thermal gravimetric analysis, and explore the effect of catalytic degradation ofthese types of catalysts under the xenon light intensity30amps which takes methyleneblue as simulation of pollutants. This paper provides some basic information forcompounding more efficient and economic non-metallic. The specific implementationsteps are as follows:The first step is the synthesis of intermediates. The study compounds1) hexakis-（4-cyanophenoxy） cyclotriphosphazene（H1） based on hexachlorocyclotriphosphazene bynucleophile substitution and determine its structure by FT-IR�'�¹H-NMR、³¹P-NMR.Then hexakis（4-tetrazolephenoxy） cyclotriphosphazene（H2） which is most crucial issynthesized from （H1）. This paper characterize it’s structure by FT-IR,¹H-NMR and ³¹P-NMR in order to give a multi-angle description to the synthesis of the targetproduct.The second step is compounding three cross-linked covalent product by （H2）synthesis with terephthaloyl chloride, and trimesoyl chloride. SEM results show thatcross-linked product, with a large specific surface area, and cross-linked product classcoral-like spatial structure and processes, which provides a necessary prerequisite forbeing a catalyst. TEM results show the synthesis of cross-linked product pieces like thefilm.The last step in this thesis is simulating degradation of different conc. of methyleneblue using the synthetic cross-linked product as a catalyst, and compares it with （H1）、hexakis-（4-（5-phenyl-1,3,4-oxazodiazol-2-yl）-phenoxy）cyclotriphosphazene （HPCP）andthese two substances in terms of quality than the1:1case the catalytic effect. Accordingto the result, the cross-linked products’s photodegradation effect is the best. This is notonly related to functional group of catalysts, but also the synergy between them, and,more importantly, the formation of spatial structure of catalyst.It can be further confirmed through the above work that the effect of the catalyst isdetermined by various factors. In this thesis different cross-linking products fromcontrolling the reaction of materials achieves a catalytic effect.Follow-up, the study will adjust the cross-linked product of bridge between thefunctional groups of the distance and type of spatial structure changes, and will continueits efforts on investigate the reaction mechanism.Metal-free catalysts, as a new catalyst for its efficiency and security characteristics,are bound to become the new favorite of the catalytic domain in the future.