and modified hyper-cross-linked polymeric adsorbent, carboxylated polymeric adsorbent were used for the removal of NA; 406 mg g^-1 [28], 719 mg g^-1 [29], 330 mg g^-1 [30], 90.25 mg g^-1 [31]; 510 mg g^-1 [32], and 441 mg g^-1 [33], respectively, but one of the
great advantages ofthe HSANGs compared with other adsorbents that the adsorption reached equilibrium within few minutes, whereas the adsorption took hours to attain equilibrium when other solid adsorbents were used for the removal of NA from aqueous solution.