N-Vinylimidazole (cas 1072-63-5) modified hyper-cross-linked resins and their adsorption toward Rhodamine B: Effect of the cross-linking degree

Add time:08/03/2019    Source:sciencedirect.com

Three N-vinylimidazole modified hyper-cross-linked resins (HP2, HP5, and HP8) were prepared and they were employed to adsorb Rhodamine B from aqueous solution. As the initial cross-linking degree increased, the Brunauer–Emmett–Teller surface area of the resins was approximately identical, while the pore volume sharply increased. Particularly, the micropore and micropore volume greatly decreased with increasing the initial cross-linking degree, while the mesopore area, mesopore volume, and average pore size increased. On the other hand, as the initial cross-linking degree increased, the feeding amount of N-vinylimidazole decreased, and the nitrogen content, the total exchange capacity, and the static contact angle lowered. The adsorption experiments indicated that HP8 was the most efficient for adsorption of Rhodamine B among the three resins, and the equilibrium capacity was up to 420.7 mg/g. The adsorption reached equilibrium within 60 min, and the intra-particle diffusion model characterized the kinetic data very well.

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