“…Thus far, many adsorbents have been reported for the removal of methyl orange such as chitosan derivatives [ 1 , 17 , 18 ], agriculture waste [ 2 , 19 , 20 , 21 ], biochar [ 3 , 22 ], clay [ 23 ], activated carbon, mesoporous silica, alumina [ 24 ], carbon nanotubes [ 25 ], nanocomposites [ 10 , 12 ], polymers, and many others [ 4 ]. Despite all the progress in this area of research, many challenges still face the application of adsorption at commercial levels due to one or more of the following adsorbent drawbacks: a low adsorption capacity, slow rate of adsorption, biodegradation of the adsorbent, low stability, high cost, complex synthesis procedure, and low selectivity and sensitivity at low concentration levels.…”