Study On Preparation And Application Of Novel Ring Crosslinked Polyphosphazene Materials

At present,the problem of water pollution is getting more and more serious.Dye industrial wastewater and oil seaborne oil spills are typical two types of pollution sources.There are various methods for the treatment of dye wastewater and oily wastewater,among which the more economical and effective method is adsorption recovery.In this paper,for the above two types of pollution sources,with hexachlorocyclotriphosphazene as the backbone,through molecular design,hydrophilic and hydrophobic two different functionalized cyclic cross-linked polyphosphazenes adsorbents were prepared and applied respectively.Dye sewage treatment and separation and recovery of oily wastewater.In this thesis,hydrophilic bicyclic phosphazene was prepared by the reaction of 2,4-diamino-6-phenyl-1,3,5-triazine with hexachlorocyclotriphosphazene to adsorb methylene blue.The reaction conditions were optimized for the standard,the reaction time was 12 h,the ratio of the amount of the substance was 1:2,the amount of binding agent was 1:2(-Cl : py),and the monomer hexachlorocyclotriphosphazene(HCCP)When the concentration was 4 g/L,the prepared product was a hollow pleated floral-like polyphosphazene with the best adsorption effect.The product was characterized by IR,SEM,XRD and TG.Then,the suitable conditions for the adsorption of methylene blue by polyphosphazene were investigated.The results show that the adsorption process has a remarkable adsorption effect at 20-40°C,no need to re-electrify the energy,and the adsorption capacity at pH=2-12 can reach over 92%.The range is wide,and the concentration of PBMA adsorbed methylene blue aqueous solution is in the range of 50-500 mg/L with a wide range.The results showed that the saturated adsorption capacity of PBMA for methylene blue adsorption was 277 mg/g.After 5 times of adsorption and desorption,the adsorption effect was still obvious.The selective adsorption of different acid-base dyes found that the adsorption process was based on acid-base adsorption.Mainly,the selective adsorption of alkaline dyes is better.Secondly,the micro-spherical hydrophobic ring-cross-linked polyphosphazenes were prepared by introducing fluorine-containing hydrophobic groups.By examining the reactant charge ratio,reaction temperature,amount of acid-binding agent,monomer HCCP concentration and other conditions,the preparation of a small particle size,surface Rough hydrophobic polyphosphazene microspheres were characterized by IR,SEM,TEM,XRD and TG,and the adsorption effect was still obvious after 7 cycles.These fully demonstrate that the hydrophobic ring-crosslinked polyphosphazene is a new type of excellent hydrophobic oil-absorbing material and can be recycled,and the adsorption amount for the oil is 4-6 g/g.In order to improve the recovery efficiency,we designed and prepared a ring-crosslinked polyphosphazene-covered melamine sponge and characterized its hydrophobicity using polarized light microscope and water contact angle meter.The results showed that the hydrophobic ring-crosslinked polyphosphazenes were chemically bonded.Firmly fixed on the sponge’s fiber,the sponge’s adsorption to the oil is 60-100 g/g after coating.Compared with the pure hydrophobic phosphorus,the adsorption capacity is increased by more than 10 times.After 10 cycles,the hydrophobic type remains.Existence,only a small amount of oil adsorption decreased.These fully demonstrate that the hydrophobic ring-crosslinked polyphosphazene is a new type of excellent hydrophobic oil-absorbing material.