Sorption enhancement of 1-naphthol onto a hydrophilic hyper-cross-linked polymer resin.
A hydrophilic hyper-cross-linked polymer resin NDA-150 was developed to remove 1-naphthol from the contaminated waters. The sorption performance of 1-naphthol on NDA-150 was explored and compared with that on the commercial hydrophobic resin XAD-4. The sorption rates of 1-naphthol onto both of the two resins obey the pseudo-second-order kinetics, and are limited by the successive steps of film diffusion and intraparticle diffusion. The greater sorption rate on XAD-4 than NDA-150 is probably due to the larger average pore diameter of XAD-4. All the adsorption isotherms can be represented by Langmuir equation. The larger capacity and stronger affinity of NDA-150 than XAD-4 probably result from the abundant microporous structure and polar groups of NDA-150. In aqueous phase hydrophobic XAD-4 adsorbs 1-naphthol driven principally by enthalpy change, while the adsorption onto hydrophilic NDA-150 driven mainly by entropy change. The breakthrough and the total sorption capacity of NDA-150 to 1-naphthol were obtained to be 1.10 and 1.58 mmol mL(-1) resin at 293 K, respectively. Nearly 100% regeneration efficiency for the resin was achieved by ethanol at 313 K.
Zhang
Weiming
W
State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, People's Republic of China. wmzhang@nju.edu.cn
Hong
Changhong
C
Pan
Bingcai
B
Zhang
Qingjian
Q
Jiang
Peijuan
P
Jia
Kun
K
D000327:Adsorption; D004058:Diffusion; D057927:Hydrophobic and Hydrophilic Interactions; D007700:Kinetics; D009284:Naphthols / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry*; D013816:Thermodynamics
C539488:NDA 150; D009284:Naphthols; D011108:Polymers; D011137:Polystyrenes; C029350:1-naphthol