Preparation, Adsorption And Photocatalytic Performance Of Flower-like Ni?OH?₂ Microspheres, TiO₂ And Its Composite

In recent years,semiconductor is widely used for photocatalytic materials because of its unique advantages.At present,energy storage photocatalyst composed by semiconductor has been a research hotspot area in the photocatalytic technology.Energy storage photocatalyst not only has the ability of photocatalytic degradation,but also can release the redox energy in the dark which stored under the illumination and continue presenting the catalytic activity.It is widely to open the scope of application of photocatalyst.In this study,p-type semiconductor?Ni?OH?₂?and n-type semiconductor?TiO₂?were successfully fabricated and compounded.The adsorption and photocatalytic performance were tested,and even the photocatalytic energy storage ability of composite was explored.The main research contents and results were listed as following:1?Flower-like Ni?OH?₂ microspheres were fabricated by direct hydrothermal,and influence of NiCl₂·6H₂O and ammonia on the morphology of Flower-like Ni?OH?₂ microspheres were also researched.We chose the preferable morphology as reactive conditions to compound four Flower-like Ni?OH?₂ microspheres and characterized them by XRD ? SEM and BET.Adsorption and photocatalytic performance of these samples were evaluated using Congo Red and Methylene blue.The experimental results showed that four kinds of flower-like Ni?OH?₂ microspheres had ideal structure,and all can reach more than 90% of the adsorption performance.However,they didn't have the high photocatalytic performance under the influence of the forbidden band width.One of four kinds Ni?OH?₂ was chosen to fabricate composite for its optimal performance.2?Four kinds of TiO₂ were prepared with different experimental conditions which using tetrabutyl titanate as precursor,ethanol as solvent,Hydrofluoric acid as surfactants.The experimental results showed that four kinds of TiO₂ were anatase phase,The TiO₂ added with HF represented the best photocatalytic activity,and Changing the pH of the dye solution will affect the performance of titanium dioxide.When the pH value is small,the adsorption effect of four kinds of TiO₂ were not ideal,but the adsorption rate increased with the increase of pH value.the best adsorption effect occured at pH 11 and four kinds of TiO₂ have higher photocatalytic degradation ability.3?Six kinds of composites were fabriacted by one step synthesis and multi-synthesis.The experiment results showed that the reaction temperature,preparation methods,additives and other factors may influence the morphology of composites.Composite of one step synthesis had the better adsorption and photocatalytic performance.Composites did not achieve the purpose of improving the photocatalytic,and speculated that the unsatifactory p—n junction was the reason of it.The experiment of photocatalytic energy storage ability manifested that composites did not have the ideal photocatalytic energy storage ability.The reasons of the unsatisfactory performance were various,such as the unsuccessful p—n junction,insufficient UV illumination,and so on.