Synthesis Of Na₂Ti₃O₇ Nanotubes Electrode And Its Adsorption Ability Of Cesium Ions Under Electrification

Cesium is one of the precious element and draws great attention in modern society because of its important application value in new energy,new materials,aerospace and other emerging fields.In addition,cesium may cause serious damage to the environment and human health once it enters the soil or invades the human body.Cesium is chemically active and is usually present as an ion in various aqueous solutions.Therefore,it is necessary to develop new techniques and methods for the extraction of cesium ions from solution.Na₂Ti₃O₇ nanotubes electrode were synthesized on surface of foam titanium plate by one-step hydrothermal method（TNT-F）.SEM,TEM,XRD,Raman and XPS were used to characterize the TNT-F.The results showed that the outer diameter and inner diameter of Na₂Ti₃O₇ nanotubes are about 7.97 nm and 4.64 nm respectively,and the fringe spacing is about 0.71 nm.The effects of adsorption potential,initial Cs⁺concentration,pH value and competing ions were investigated.The results show that TNT-F has the dual functions of electrode and adsorption under electric field conditions,and has excellent adsorption performance for Cs⁺.The adsorption performance increases with the increase of potential,and the most suitable adsorption potential is 20V.The increase of initial Cs⁺concentration will also increase the adsorption capacity and shorten the adsorption time.The adsorption performance is slightly affected by pH value of solution and decreases slightly due to the presence of competing ions,but it is still within the applicable range.In addition,a series of experiments were also carried out to explore the desorption ability,reusability and reproducibility of TNT-F in electrochemically switched ion exchange system.The results show that the desorption ratio also can be greatly improved by applying potential.And TNT-F has excellent reusability and reproducibility,which makes it show great adsorption-desorption performance in complex competing ionic solutions.The adsorption kinetics experiment of TNT-F under the electric field condition was also carried out.The results showed that the adsorption process conforms to the pseudo-second order and the adsorption of Cs⁺by TNT-F is a chemical adsorption.The theoretical maximum adsorption capacity is 66.67 mg/g.