Adsorption Performance of One- and Two-Component Anionic Dyes Using Core-Shell ZIF-8@ZIF-67
Journal of Solid State Chemistry(2022)
Chong Qing Univ
Abstract
The discharge of dye wastewater threatens the ecology and biological health. Adsorption technology is the preferred treatment method and absorbent is core. In this study, a high-performance ZIF-8@ZIF-67 adsorbent was synthesized by epitaxial growth. XRD and TEM demonstrated the successful synthesis of the core-shell ZIF-8@ZIF-67 and BET showed that the specific surface area, pore volume and diameter of ZIF-8@ZIF-67 were 1518.75 m2/g, 0.65 cm3/g and 1.71 nm, respectively, with microporous being the predominant. The optimum adsorption con-ditions for the adsorption of Direct Blue-86 by ZIF-8@ZIF-67 were an initial concentration of 150 mg/g, a ZIF-8@ZIF-67 dosage of 5 mg, and a pH of 8, and the adsorption capacity at this condition was 301.69 mg/g. The mechanism of adsorption on Direct Blue-86 has been speculated to be electrostatic interaction, hydrogen bonding, Lewis acid-base interaction, 7C -7C stacking and coordination. The kinetics of adsorption of Reactive Yellow and Congo Red in the two-component system were both consistent with the pseudo-second-order kinetic models, with chemisorption being the rate-controlling step and the adsorption rates of Reactive Yellow and Congo Red were both higher than that of one-component system. Meanwhile, they were more consistent with the Langmuir monolayer adsorption models, with maximum adsorption capacities of 261.10 mg/g and 291.55 mg/g, respec-tively, a decrease of 56.66% and 54.52% compared to that in the one-component system.
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Key words
ZIF-8@ZIF-67,Direct Blue-86,Two-component dye system,Adsorption
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