Preparation And Properties Of Polyarylene Ether Nitriles Composite Photocatalyst

As the main pollution discharge of textile printing and dyeing industry,organic dye wastewater causes great harm to water ecological environment and various organisms because of its high toxicity and persistence.Compared with conventional treatment methods,photocatalytic technology has an inestimable future in the efficient treatment of dye wastewater,but the powder catalyst is easy to agglomeration,difficult to treat and recover,resulting in waste and pollution.This article selects the widespread use of titanium dioxide（TiO₂）as the research object,with special polymer polyarylene ether nitriles（Polyarylene Ether Nitriles,PEN）for the construction of primitive,using polymer materials good capability of adsorption and photocatalytic performance to achieve synergy,through enhancing mass transfer process of water pollutant removal efficiency,at the same time,the stable photocatalyst immobilized on the polymer substrate.The specific research contents are as follows:1.Polymer support materials with cubic morphology were prepared by coordination between Fe³⁺and PEN,and a series of PEN composite photocatalysts(PEN-Fe³⁺@TiO₂)were obtained by carrying nano-TiO₂.The adsorption and photocatalytic degradation characteristics of PEN-Fe³⁺@TiO₂ were studied in methylene blue.The kinetic fitting results of the adsorption process show that the whole adsorption process fits the quasi-second-order kinetic model,indicating that the adsorption process is dominated by chemical adsorption.It was found that PEN-Fe³⁺@TiO₂ composite showed good adsorption performance under alkaline conditions.By adjusting TiO₂ load,the equilibrium adsorption capacity of PEN-Fe³⁺@TiO₂ can reach 914.42 mg/g,and the photocatalytic degradation rate can reach 99%.2.The magnetic PEN polymer microspheres were prepared by milk-assisted self-assembly strategy,and TiO₂ nanoparticles were loaded in situ on the surface to obtain magnetic PEN composite photocatalyst（Fe₃O₄@PEN@TiO₂）.The photodegradation efficiency of the prepared composite photocatalyst for methylene blue is up to 99.6%by controlling the placement ratio of the precursor to achieve the load of nano TiO₂.At the same time,under the action of external magnetic field,the powder photocatalyst can be quickly recovered within 10 s,after three cycles of the composite photocatalyst for methylene blue still has a good adsorption degradation rate（75%）,with good recovery and reuse characteristics.3.Fe₃O₄@PEN@TiO₂-2 composite photocatalyst with the best adsorption and degradation performance was selected as the research object to explore its adsorption and degradation performance of different types of dyes,and the influence of external factors such as initial concentration of dyes,different temperatures,different p H values and different water quality on its adsorption and degradation performance.The experimental results show that:in methylene blue,methyl orange,rhodamine B and other sewage like dyes,Fe₃O₄@PEN@TiO₂-2 showed the best adsorption properties for methylene blue,and the saturated adsorption capacity can reach 682.29 mg/g under alkaline conditions,degradation rate can reach 99%.