Development of pH-sensitive hydrogel nanocomposite based on acrylic acid/ graphene oxide/acryloyl tetra ammonium thiacalix[4]arene for separation of cationic dyes

Hydrogels Based on Polyacrylamide and Functionalized Carbon Nanomaterials for Adsorption of a Cationic Dye

“…The results obtained herein approach or even surpass those obtained in other works. The adsorption capacity obtained by the GO-0.25 hydrogel is 274 mg.g -1 , which is a value greater than double or even quadruple the values obtained by the nanocomposites of poly(acrylic acid), graphene oxide and monoacryloyl tetramonium tiacalix [4]arene [19] and by graphene oxide and aminated lignin aerogels [30]. The adsorption capacities of 289.10 and 265.87 mg.g -1 obtained in the works of Zhang et al [31] and Chen et al [32] are values closer to those obtained in this work.…”

“…The systems were kept under gentle agitation, and the study was carried out over a period of 24 h. At intervals of 1, 2, 3, 4, 6 and 24 h, aliquots of the solution were collected to determine the concentration of dye remaining after each interval. The concentrations were determined with the aid of a UV-VIS Perkin Elmer spectrophotometer Lambda 35 at the maximum wavelength of 620 nm for MG using the Beer-Lambert law [19]. A previously made calibration curve was used to determine concentrations after each interval.…”

“…The removal percentage was calculated by subtracting the initial concentration (C i ) of the dye from the nal concentration (C f ) and dividing by the initial concentration (C i ) as described in equation 3 [19]:…”

“…Poly(acrylic acid), graphene oxide and monoacryloyl tetraammonium thiacalix [4]arene nanocomposite 96.25 67.5 [19] Compound of hydroxyethyl starch and graphene oxide 91.1 89.3 [29] Graphene Oxide/Amine Lignin Aerogels 91,72 113.5 [32] Magnetic carboxymethyl functionalized chitosangraphene oxide compound over than 90 289.1 [30] Fe 3 O 4 @SiO 2 -Graphene oxides core-shell magnetic microspheres approximately 70 265.87 [31] Polyacrylamide graft copolymer and potato starch less than 20 5.9 [33] Amine guar gum/graphene oxide nanocomposite 98 230.56 [35] Polyacrylamide and graphene oxide nanocomposite 76 274 This work…”