“…On the other hand, the non-conventional method of adsorption is more effective and efficient [ [17] , [18] , [19] , [20] , [21] ]. The presence of benzene rings and functional groups on the structures of IBU and MB enhances the ability of carbonaceous material derived from agricultural waste to adsorb these substances from water [ 22 , 23 ]. The properties of carbonaceous materials can be adjusted by treatment with solutions of oxidizing agents (KMnO 4 , NaOCl, HNO 3 , H 2 SO 4 , H 2 O 2 , H 3 PO 4 etc) [ 8 , [24] , [25] , [26] ].…”