“…Currently, biomass agricultural waste materials such as rice husks [2], rice straw [3], waste tea [4], olive waste [5], coffee husks [6], barley husks [7], forest industries waste materials such as sawdust [8], fibers [9], switchgrass [10], bamboo culms [11], and agricultural-industries waste such as oil palm shell [12] etc. were used as raw materials for preparing AC, because these materials possess high carbon contents and are low in cost [13].…”