Abstract
To address the problem of cationic organic dye pollution in wastewater, a hydrogel of glycidyl methacrylate-phytic acid crosslinked maleic anhydride-β-cyclodextrin (PAG-β-CDM) was synthesized through free radical polymerization. The structure of PAG-β-CDM was characterized by FT-IR, XPS, elemental analysis, ICP, SEM, XRD, inverse and photometric titrations. The adsorption capabilities of PAG-β-CDM for cationic dyes were studied as well. The results revealed that PAG-β-CDM has a porous structure with abundant functional groups that can effectively adsorb cationic dyes through host-guest interactions, hydrogen bonding, and electrostatic interactions. The maximum adsorption capacities for malachite green, crystal violet, methylene blue and astrazon pink FG were 3655.47, 3183.2, 1336.33, and 2987 mg/g, respectively. Over 90% of the dyes were adsorbed within the first 15 min, indicating that the adsorption rate of dyes on PAG-β-CDM is fast. The results from the adsorption kinetics and isotherms data are consistent with predictions from both Langmuir isotherm model and pseudo-second-order kinetic model. Thermodynamic results indicated that the adsorption of cationic dyes on PAG-β-CDM is spontaneous and exothermic. Additionally, PAG-β-CDM demonstrated high stability and good regenerative capacity over five regeneration cycles.
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