Synthesis And Properties Of Polyacid-based Composite Materials

With the development of society,the application of polyacid-based compos ite materials has been very extensive,Polyacid-based composite materials have been involved in various aspects of industry,life,etc.Polyacid-based composite materials play an important supporting role for human survival and developme nt.The development of materials science plays an important role in the develo pment of other directions.A single-function material cannot meet the needs of people today,and it has become a new trend to develop the same material for different applications.We used(Ni C₁₀H₂₆N₆)₂(Si W₁₂O₄₀)and strontium titanate as substrates to synthesize composite materials,and investigated the photocatal ytic performance and mechanism of the composite materials respectively.Durin-g the experiment,(Ni C₁₀H₂₆N₆)₂(Si W₁₂O₄₀)showed photochromic properties,and further synthesized three polyoxometalates.And its photochromic properties we re studied.The specific research content is as follows:?1?A simple water bath method was used to synthesize heteropolymetal oxoate from Keggin-type polyacid with macrocyclic nickel(Ni C₁₀H₂₆N₆)?Cl O₄?₂ and then load ferric oxide to synthesize composite materials.Studies have shown that(Ni(C₁₀H₂₆N₆)₂(Si W₁₂O₄₀)-Fe₂O₃ has different adsorption and degradation properties for different substances.For Rhodamine B solution,the degradation rate of NF-3reaches 98%,and the degradation effect of NF-4 sample is the best,which can completely degrade Rhodamine B solution.For the degradation effect of2,4-dinitrophenol,NF-3 reached 90.2%.At the same time,the degradation mechanism was investigated.?2?We used(Cu C₁₀H₂₆N₆)?Cl O₄?₂and(Ni C₁₀H₂₆N₆)?Cl O₄?₂ to modify Keg-gin type Silicotungstic acid to synthesize(Cu C₁₀H₂₆N₆)₂(Si W₁₂O₄₀)and(NC₁₀-H₂₆N₆)₂(Si W₁₂O₄₀).It was characterized by FTIR,EM,XPS and DRS.Through experiments,we found that it has excellent photochromic performance under both visible light and simulated sunlight.Under simulated sunlight,it can be converted to intermediate colors within 20 s,and the color can be completely changed within 1 min.It takes about 5 min under visible light.At the same time,the mechanism was explored.?3?We synthesize(Cu C₁₀H₂₆N₆)₃(PMo₁₂O₄₀)₂,(Ni C₁₀H₂₆N₆)₃(PMo₁₂O₄₀)₂ by modifying H₃PMo₁₂O₄₀ with(Cu C₁₀H₂₆N₆)?Cl O₄?₂ and(Ni C₁₀H₂₆N₆)₃(PMo₁₂O₄₀)₂Two new polyacid-based composite materials,Through experiments,it was found that these two materials have excellent photochromic properties.Through a series of investigations,we have proposed a possible mechanism of color change.?4?The ternary polyacid-based composite material was synthesized by a simple hydrothermal method.The metal composite oxide Sr Ti O₃ was modified with Ag₃PO_4.During the synthesis,Ti O₂ hydrolyzed by butyl titanate was combined with Ag₃PO₄and Sr Ti O₃ to form a stable heterojunction.Studies have shown that when given visible light for 10 minutes,SA-2 degrades tetracycline by more than 90%,and it is almost completely degraded in 15 minutes.At the same time,its degradation mechanism were explored.