Organic Functionalization Of Electrode Based On Graphene In Capacitive Deionization With High Performance

Capacitive deionization is a water quality desalination technology based on the principle of electric double-layer capacitor.The cations and anions in solution move towards two poles of capacitor under the force of electrostatic field and are adsorbed into electrode material on the purpose of purifying and desalting.The technology is favored because of its green environmental protection,energy conservation,high efficiency and low secondary pollution.Carbon materials,such as graphene,carbon aerogels and so on,not only have good conductivity,but also have large special area,which can form a strong surface electric double layer in the electric field.Therefore,they are widely used as electrode materials in CDI technology.In this paper,graphene was used as carbon precursor.The first study was the optimum reaction temperature of amino polystyrene and graphene oxide,then discuss the synthesis effect between Diethylenetriamine,triethylene-tetramine,Octanethylenediamine and some small molecules with different amino numbers and graphene oxide,which help constructing amino polystyrene-reduced graphene doping with tin oxide and amino small molecule functionalized graphene for electric adsorption detection.On this basis,different proportion of amino small molecular functional graphene and activated carbon were mixed to achieve the purpose of enhancing the adsorption effect of activated carbon.The research results show that:(1)the optimal reaction temperature of amino polystyrene and graphene oxide is 120?.Under the synergistic effect of conjugate structure and tin oxide,the compound material has special capacitance of 122.2 F/g,the charge transfer resistance of 0.93 ?,the special surface area of 141.00 m/g,the adsorption capacity of 8.07 mg/gand excellent cycle stability.(2)Because of tiny steric hindrance,triethylene-tetramine and other short chain amino molecules can form high hydrophilic functional materials with good capacitance.The functionalization of octanethylenediamine is lame for its poor reaction sites and its special capacitance is 29%-48%less than other contrast material.The functional GO is mixed with AC in the radio of 10:90,the synergistic effect of graphite substrate and AC can effectively increase the special capacitance compound material and greatly improve its adsorption efficiency.At this time,the specific capacitance and adsorption capacity of the material are 294.57 F/g and 15.17 mg/g respectively.