Obtaining clean water from salt by capacitive deionization (CDI) with chemically modified graphene (rGO) was explored in this study. Strong acid (HNO3:H2SO4 = 2:1) employed to modify rGO enhance its hydrophilicity and electrochemical properties. Characteristics of with/without modification were analyzed XRD, SEM, FTIR, contact angle, BET, cyclic voltammetry (CV). Contributions sulfonic groups, ...