▎ 摘　　要

Natural polysaccharides were used as adsorbents for the removal of toxic dyes from effluents. First, nanocomposites of chitosan (CH), graphene oxide (GO), sodium alginate (ALG), and beta-cyclodextrin (beta-CD) were synthesized. The synthesized nanocomposites were characterized by XRD, FTIR, FE-SEM, and EDS to know their interactions and morphology. The adsorption performance of GO/ALG/CH and GO/ALG/CH/beta-CD nanocomposites was studied by adsorbing rose Bengal (anionic dye) under different reaction conditions (e.g., concentration of dye solution, temperature, adsorbent dosage, adsorption time, and pH). Among the two studied adsorbents, a higher adsorption capacity was reached using GO/ALG/CH/beta-CD nanocomposite. It was seen that adsorption of dye increased with the agitation period and attained equilibrium at 540 min for GO/ALG/CH/beta-CD and at 660 min for GO/ALG/CH nanocomposite. Various kinetic models were analyzed and from all models, pseudo-second-order was the best fit model for adsorption. The adsorption equilibrium data followed the Langmuir isotherm model that indicated that the adsorption process is a monolayer. The adsorption process was exothermic and spontaneous, and the lower temperature was favorable for rose Bengal dye adsorption. The mechanism of adsorption of rose Bengal involves both physical and hydrogen bonding due to polymer and inclusion formation due to beta-CD through host-guest interactions. [GRAPHICS]