Study On Preparation Of Ionic Materials And Selective Capture Of CO And SO₂

In recent years,harmful gases?such as CO and SO₂?emitted from industrial waste gas pose a great threat to human health and enviroment.On the other hand,CO and SO₂are favorable basic raw gas,which can be used to synthesize all kinds of value-added chemicals.At present,the selective capture of CO and SO_2,and the absorption rate are still scientific issues that need to be solved urgently.Therefore,in order to solve the above problems,this paper designed and synthesized different ionic materials for the capture of CO and SO₂ according to the gas characteristics of CO and SO₂.The main research contents are as follows:Firstly,a cuprous acetate proton-type ILs?[EimH][OAc]-0.6CuOAc?was synthesized,it shows efficient and selective for absorbing CO at 293.2 K and 1 bar,the absorption capacity of CO is 0.42 mol CO per mol Cu⁺and the equilibrium time was only 10 min.More importantly,the ideal selectivity of CO/N₂ and CO/H₂ is 967 and 93respectively,which is of great significance for the selective separation of CO in industrial waste gas.Then,the infrared spectra and theoretical calculations show that the gas absorption process coexists with physical and chemical absorption behaviors,and the chemical absorption is the main part to absorption by combining the formation of Cu?CO?⁺.In addition,the ionic liquid shows good recyclability.Secondly,a hypercrosslinked hollow nanotube ionic polymers?HNIPs?was designed,which shows extremely fast and highly efficient for SO₂ absorbed from flue gas.The HNIP-TBMB-1 exhibited very high SO₂ absorption capacity(7.2 mmol g^-1)and outstanding SO₂/N₂?3186?and SO₂/CO₂?91?separation selectivity at 298 K and 1bar.Additionally,HNIP-TBMB-1 also shows unprecedented SO₂ adsorption rate,can reach the equilibrium time to 1.75 min,as well as the diffusion time constant was estimated to be 0.25 min^-1 corelated by Fick's diffusion model.Dynamic breakthrough experiments further demonstrated the excellent performance of HNIP-TBMB-1 in removing 3000 ppm SO₂ in actual flue gas.Furthermore,HNIP-TBMB-1 showed good reversibility in adsorption–desorption cycles.The present work demonstrates that designing a HNIP material that has the special architectural feature of hollow nanotubes with inner-channels,can be an effective strategy for realizing ultrafast,selective,and reversible SO₂ capture.