Binary competitive adsorption of naphthalene compounds onto an aminated hypercrosslinked macroporous polymeric adsorbent.
An aminated hypercrosslinked macroporous polymeric adsorbent was synthesized and characterized. Adsorption isotherms for 1-amino-2-naphthol-4-sulfonic acid (1,2,4-acid) and 2-naphthol obtained from various binary adsorption environments can be well fitted by Freundlich equation, which indicated a favorable adsorption process in the studied range. Adsorption for 1,2,4-acid was an endothermic process in comparison with that for 2-naphthol of an exothermic process. 2-naphthol molecules put a little influence on the adsorption capacity for 1,2,4-acid. However, the adsorption to 1,2,4-acid depressed that to 2-naphthol in a large extent for the stronger electrostatic interaction between 1,2,4-acid and adsorbent. The predominant mechanism can be contributed to the competition for adsorption sites. And the simultaneous environment was confirmed to be helpful to the selective adsorption towards 1,2,4-acid based on the larger selectivity index.
Liu
Fu-qiang
FQ
State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, China. jogia@163.com
Chen
Jin-long
JL
Cheng
Xiu-mei
XM
Ge
Jun-jie
JJ
Li
Ai-min
AM
Zhang
Quan-xing
QX
D000327:Adsorption; D008962:Models, Theoretical; D009281:Naphthalenes / Q000737:chemistry*; D011108:Polymers; D016062:Porosity; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D009281:Naphthalenes; D011108:Polymers; D014874:Water Pollutants, Chemical