Carbon was prepared by the carbonization of walnut shell (Basra market-Iraq) at 500 °C under N2 flow. A conclusion has been reached by many researchers [7–8] that hydrogen bonding network with carbon can be formed by the reaction with good proton conductive medium. Therefore, phosphoric acid was used as a proton conductive medium to interact with carbon through proton transfer reaction. A reactor connect with vacuum pump was used to maintain the pressure of the reaction. The carbonized sample was stirred with concentrated H3PO4 (J. T. Baker) under vacuum (0.7104 mbar) at room temperature for 6 h and subsequent sample was refluxed at 150 °C for 6 h under vacuum (0.7104 mbar). The slurry was then filtered and dried at 100 °C, followed by activated at 500 °C under N2 gas flow. Ash content was determined after complete combustion of the powder aliquot (5 g) in a muffle furnace at 900 °C and weighing the residue. Each sample was divided into a minimum of three replicates, at least.