Equilibrium and kinetic studies on the adsorption of aniline compounds from aqueous phase onto bifunctional polymeric adsorbent with sulfonic groups.
In the present study, a hydrophilic bifunctional polymeric resin (LS-2) with sulfonic groups was synthesized, and the adsorption performance of three aniline compounds, aniline, 4-methylaniline, and 4-nitroaniline onto LS-2 was compared with that on the commercial Amberlite XAD-4. The uptake of the aniline compounds on LS-2 is a procedure of coexistence of physisorption and chemisorption and obeys the pseudo-second order rate equation, while the uptake of the compounds on XAD-4 is merely a physical adsorption and follows the pseudo-first order rate equation. All the isothermal data fit well with the Freundlich model, and the values of K(F) of the compounds adsorbing on LS-2 are much higher than those on XAD-4 suggesting the higher adsorbing capacities on LS-2 than those on XAD-4, which may be attributed to the microporous structure and the polar groups on the network of LS-2 resin. Dynamic adsorption and desorption studies for aniline on LS-2 show that the breakthrough adsorption capacity and the total adsorption capacity are 0.96 and 1.24 mmol per milliliter resin, respectively. Nearly 100% regeneration efficiency for the adsorbent was achieved by 5% hydrochloric acid.
Jianguo
Cai
C
State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, PR China. ciger6267@163.com
Aimin
Li
L
Hongyan
Shi
S
Zhenghao
Fei
F
Chao
Long
L
Quanxing
Zhang
Z
D000327:Adsorption; D000814:Aniline Compounds / Q000737:chemistry*; D007700:Kinetics; D011137:Polystyrenes / Q000138:chemical synthesis / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry*; D012117:Resins, Synthetic / Q000138:chemical synthesis / Q000737:chemistry*; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000379:methods
D000814:Aniline Compounds; D011137:Polystyrenes; D011145:Polyvinyls; D012117:Resins, Synthetic; D014874:Water Pollutants, Chemical; C019498:4-nitroaniline; C012101:XAD-4 resin; C003771:Amberlite XAD-2 resin; C023650:aniline; C021313:methylaniline