Adsorption of trichloroethylene and benzene vapors onto hypercrosslinked polymeric resin.
In this research, the adsorption equilibria of trichloroethylene (TCE) and benzene vapors onto hypercrosslinked polymeric resin (NDA201) were investigated by the column adsorption method in the temperature range from 303 to 333 K and pressures up to 8 kPa for TCE, 12 kPa for benzene. The Toth and Dubinin-Astakov (D-A) equations were tested to correlate experimental isotherms, and the experimental data were found to fit well by them. The good fits and characteristic curves of D-A equation provided evidence that a pore-filling phenomenon was involved during the adsorption of TCE and benzene onto NDA-201. Moreover, thermodynamic properties such as the Henry's constant and the isosteric enthalpy of adsorption were calculated. The isosteric enthalpy curves varied with the surface loading for each adsorbate, indicating that the hypercrosslinked polymeric resin has an energetically heterogeneous surface. In addition, a simple mathematic model developed by Yoon and Nelson was applied to investigate the breakthrough behavior on a hypercrosslinked polymeric resin column at 303 K and the calculated breakthrough curves were in high agreement with corresponding experimental data.
Liu
Peng
P
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, PR China.
Long
Chao
C
Li
Qifen
Q
Qian
Hongming
H
Li
Aimin
A
Zhang
Quanxing
Q
D000327:Adsorption; D001554:Benzene / Q000302:isolation & purification*; D005740:Gases; D007220:Industrial Waste / Q000517:prevention & control*; D008962:Models, Theoretical; D011108:Polymers / Q000737:chemistry; D011312:Pressure; D012117:Resins, Synthetic / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics; D014241:Trichloroethylene / Q000302:isolation & purification*; D014835:Volatilization
D005740:Gases; D007220:Industrial Waste; D011108:Polymers; D012117:Resins, Synthetic; D014241:Trichloroethylene; D001554:Benzene