| 摘要： |
A series of novel L-malic acid modified hyper-cross-linked resins were synthesized from macroporous chloromethylated styrene-divinylbenzene copolymer by Fridel-Crafts reaction and esterification reaction. The adsorption behavior of the resin toward p-aminobenzoic acid was investigated from aqueous solution. KZ-3 displayed the most outstanding adsorption capacity due to its proper surface structure and higher functional group utilization rate. Subsequently, the adsorption kinetic of p-aminobenzoic acid onto precursor resin Z-3, modified resin KZ-3 and commercially available polymeric adsorbent H-103 was compared. The result demonstrated that KZ-3 had the optimal adsorption capacity because of its hydrogen bonding driving force and hydrophilicity enhancement which brought by oxygen-containing functional groups. Especially, KZ-3 is 3 times higher than the precursor resin in terms of adsorption rate. Kinetic curves could be characterized by pseudo-second-order rate equation and both the intra-particle diffusion and the film diffusion were the rate-limiting steps. The isotherms could be fitted by Langmuir model and the adsorption was an exothermic, spontaneous and more ordered arrangement process due to its negative thermodynamic parameters. (C) 2018 Taiwan institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved. |
