Selective adsorption of p-chloronitrobenzene from aqueous mixture of p-chloronitrobenzene and o-chloronitrobenzene using HZSM-5 zeolite.
The selective adsorption of p-chloronitrobenzene (p-CNB) using zeolite as the adsorbent from an aqueous mixture containing p-CNB and o-chloronitrobenzene (o-CNB) was investigated. The maximum adsorption amounts of p-CNB in HZSM-5 zeolite were found to be approximately 4 molecules per unit cell (mol/uc) at all adsorption temperatures investigated. The maximum adsorption amounts of o-CNB in HZSM-5 zeolite were, however, markedly lower than those of p-CNB at different adsorption temperatures. Diffusion results revealed that the diffusivity of p-CNB at 300K was about 100 times higher than that of o-CNB in HZSM-5 zeolite. The remarkable difference in the adsorption amounts and diffusivities between p-CNB and o-CNB resulted in separation factors of 463.6, 96.8 and 21.9 for p-CNB at 278, 300 and 323 K, respectively, indicating a selective adsorption of p-CNB in HZSM-5 zeolite from the aqueous mixture of p- and o-CNB.
Guo
Zhaobing
Z
State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210093, PR China.
Zheng
Shourong
S
Zheng
Zheng
Z
Jiang
Fang
F
Hu
Wenyong
W
Ni
Lixiao
L
D000327:Adsorption; D004058:Diffusion; D009578:Nitrobenzenes / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D017641:Zeolites / Q000737:chemistry*
D009578:Nitrobenzenes; D017641:Zeolites; C010407:4-chloronitrobenzene; C032785:2-chloronitrobenzene