Synthesis And Application Of Hydrogel Based Prussian Blue Nanocomposite Materials

As a kind of clean and efficient energy,Nuclear energy production may cause environmental problem if safety precautions are not adequately implemented.The leaked radioactive contaminates with highly transport abilities are easily dissolved in water and soils end up in plant materials,even end up in animals and human beings.The isotope ¹³⁷Cs is considered as the most critical radionuclide from the environme nt a l standpoint,because of its relatively long half-life time,high diffusivity,and high solubility.The Cs contaminates commonly exist and transport in monovalent state.Finding a highly efficient way to remove 137Cs is still an important current and focus of research.For the past decades,a series of materials have been reported for the Cs ions selective remove.The reported methods of making use of PB-based adsorbents for Cs ions remove,such as granules adsorption,block adsorption and membrane adsorption,they all have certain shortcomings like complex separation procedures,low efficiency and uncontinuity.So we design an adsorption material,PB-based tube that can be used for efficient fluidic Cs ions remove.Cs ions can be selectively adsorbed by the wall of tube when the Cs aqueous contaminants flow through.Achieving the idea is still a challenge.The work can be divided into the following three parts.1.Synthesis and characterization of double-network hydrogel polyacrylamide/pol y2-acrlamido-2methylpropanesulfonic（PAAm/PAMPS）.Prepared PAAm/PAMPS by two-step polymerization reactions,and characterized by Fourier Transform Infrared Spectroscopy（FTIR）,morphology characterized by scanning electron microscope（SEM）.2.Synthesis and characterization of Prussian blue@Double-network hydrogel（PB@PAAm/PAMPS）.Immersed the PAAm/PAMPS in K₃[Fe（CN）₆]solution for preparation of Prussian blue getting PB@PAAm/PAMPS.Characterized the Cs ions adsorption property of PB@PAAm/PAMPS,The Cs ions adsorption kinetics curve,isothermal adsorption curves of the hydrogels and the cesium ion adsorption performance curves of the PAAm/PAMPS tube and PB@hydrogel tube were obtained.The Cs ions uptake of PAAm/PAMPS reached over 220 mg g-1,The Cs ions capacity of PB@DNH reached up to 397 mg g^-1 in 10 minutes（278K,1000ppm Cs⁺）.3.Shaping of PB@PAAm/PAMPS and Cs ions adsorption research.Prepared PAAm/PAMPS tubes and bowls by glass reaction cel,then prepared Prussian blue nanoparticles in situ by monophyletic method.Carried out the fluidic Cs ions adsorption experiment with peristaltic pump to control the Cs ions aqueous flow rate.The fluid ic Cs ions adsorption curves of PB@hydrogel were obtained with the target of 80%Cs ions remove percent,the cesium ion content can be removed by the maximum efficiency of cesium ion solution at a certain flow rate,but if increased the flow rate we still can kept the tube fluidic Cs ions remove percent by lengthening PB@DNH tube.On the basis of the raw data,the curve was fitted well with a model equation(y=69.795*^0.475),suggesting a relationship between the required length of PB@DNH tube and the flow rate.