Coconut shells collected from coconut are obtained from Egyp-tian local markets and were used as precursor. Firstly, they werewashed with distilled water to remove any adhering impurities,and then dried at 110◦C for 24 h followed by grinding and sievingin order to use a particles size ranged between 1 mm and 2 mm.NaOH/activated carbon sample (C) was prepared via two steps: car-bonization of dried precursor at 600◦C for 4 h in absence of air usinga stainless steel reactor (600 mm × 40 mm) at a rate of 10◦C/min upto 600◦C. The carbonized sample was cooled and soaked with cer-tain weight of NaOH (40 g of carbonized sample with 120 g of solidNaOH) in 50 ml distilled water for 48 h at room temperature, fol-lowed by drying at 110◦C and finally activated at 750◦C for 4 h.Prepared sample was washed several times with distilled watertill neutral filtrate and then dried at 110◦C to constant weight andfinally stored in a clean dry glass bottle.