Control Of Hydration Particle Size Of Fe₃O₄@SiO₂ Nanoparticles,Dispersion And Its Adsorption Behavior

The traditional sewage treatment method has various problems such as long time,large area and high cost.These problems can be improved by using Fe₃O₄@SiO₂MNP for wastewater treatment.In this paper,Fe₃O₄@SiO₂MNP magnetic nanoparticles are studied from four aspects:enhanced dispersibility,optimized preparation methods,explored dispersibility in different environments,and adsorption performance,and obtained valuable experimental results.The main conclusions are as follows:（1）The preparation conditions of Fe₃O₄@SiO₂ magnetic nanoparticles with different hydrated particle sizes were studied.The hydration particle size of the prepared Fe₃O₄@SiO₂MNP was changed by changing the preparation temperature,the amount of TEOS and ammonia used,and 100～200nm,200～300nm,250～350nm,400～500nm,and 900nm’s methods for hydration particle size.（2）To study the influencing factors of Fe₃O₄@SiO₂MNP,experiments were performed in different anions,cations and p H.It’s found that the dispersibility of Fe₃O₄@SiO₂MNP has a small relationship with the type of ions,but has a strong relationship with the ion concentration and valence state.The higher the concentration of the solution,the worse the dispersibility,and the existence of high-valence ions in the solution,the worse the dispersibility.In different p H environment,the dispersibility is better at 3～5,7～11,and the worst is at 5～6.（3）Fe₃O₄@SiO₂MNP were used to adsorb methylene blue and microcystis aeruginosa.The adsorption of 5 different concentrations of methylene blue solution was found to be consistent with Freundlich model and quasi-second-order kinetic model;2different concentrations of Microcystis aeruginosa were adsorbed at normal temperature and low temperature,and it was found that low temperature can inhibit algae growth.But the adsorption efficiency is higher at room temperature.