Abstract
To achieve simultaneous adsorption removal of anionic and cationic dyes, UiO-66-NH2@Dodecyl functionalized with dodecyl (long-chain alkane) and UiO-66-NH2@PEI modified by polyethyleneimine (PEI) (containing multiple amino groups) were facilely fabricated by post-synthesis functionalization strategy, and characterized systematically. UiO-66-NH2@Dodecyl and UiO-66-NH2@PEI both showed higher adsorption capacities for Congo red (458.2 and 583.4 mg/g) and methylene blue (218.0 and 286.3 mg/g). Adsorption kinetic and isotherm curves could be simulated best by pseudo-second-order kinetic model and Langmuir isotherm model, respectively. Under coexistence of inorganic salts and alkalinity, it was beneficial to improve adsorption capacities. Adsorption capacity of UiO-66-NH2@PEI with multiple amino groups was higher than UiO-66-NH2@Dodecyl at the same experimental conditions, indicating that hydrogen bonding had greater influence on adsorption efficiency. And UiO-66-NH2@Dodecyl and UiO-66-NH2@PEI had better stability. Hydrogen bonding, π-π conjugation, electrostatic interaction and van der Waals force were main adsorption driving forces. The results could provide theoretical and technical help for simultaneous adsorption removal of anionic and cationic dyes.
Published Version
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