About 6g of sample were placed in the stainless steel device and heated from room temperature (30±1oC) to carbonization temperatures of 700oC, with a heating rate of 10oC/min. The sample was kept at the carbonization temperature for a retention time of 1 hour. The sample was then cooled to room temperature naturally, washed with deionized water, followed by 0.1M
hydrochloric acid solution until the washing solution reached pH 7.0 to neutralize the sample surfaces. The sample was then dried in an oven at 105±1oC and stored in desiccator till further use. All produced chars were then sieved between 100-70 µm size
using standard sieves and underwent further adsorption studies.