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Frontiers of Environmental Science & Engineering

Front. Environ. Sci. Eng.    2016, Vol. 10 Issue (3) : 482-490
The prediction of adsorption isotherms of ester vapors on hypercrosslinked polymeric adsorbent
Liuyan WU,Lijuan JIA,Xiaohan LIU,Chao LONG()
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
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Adsorption isotherms of methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate and ethyl propionate on hypercrosslinked polymeric resin (ND-100) were measured at 303K, 318K and 333K,respectively, and well fitted by Dubinin–Astakhov (DA) equation. The plots of the adsorbed volume (qv) versus the adsorption potential (?) at three different temperatures all fell basically onto one single curve for every ester. A predicted model based on DA equation was obtained on the basis of adsorption equilibrium data of methyl acetate, ethyl acetate and ethyl propionate at 318K. The model equation successfully predicted the adsorption isotherms of methyl acetate, ethyl acetate and ethyl propionate on ND-100 at 303K, and 333K, and also gave accurate predictive results for adsorption isotherms of the other two ester compounds (propyl acetate and isopropyl acetate) on ND-100 at 303K, 318K and 333K. The results proved the effectiveness of DA model for predicting the adsorption isotherms of ester compounds onto ND-100. In addition, the relationship between physico-chemical properties of adsorbates and their adsorption properties was also investigated. The results showed that molecular weight, molar volume and molar polarizability had good linear correlations with the parameter E (which represents adsorption characteristic energy) of DA equation.

Keywords hypercrosslinked polymeric adsorbent      adsorption isotherm      ester      prediction     
Corresponding Authors: Chao LONG   
Online First Date: 04 December 2015    Issue Date: 05 April 2016
 Cite this article:   
Liuyan WU,Lijuan JIA,Xiaohan LIU, et al. The prediction of adsorption isotherms of ester vapors on hypercrosslinked polymeric adsorbent[J]. Front. Environ. Sci. Eng., 2016, 10(3): 482-490.
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Liuyan WU
Lijuan JIA
Xiaohan LIU
parameters ND-100
SBET/(m2·g-1) 1325
Vmicro/(cm3·g-1) 0.423
Vmeso/(cm3·g-1) 0.194
Vtotal/(cm3·g-1) 0.617
Tab.1  Salient properties of ND-100
adsorbates methyl acetate ethyl acetate propyl acetate isopropyl acetate ethyl propionate
molecular weight/(g·mol-1) 74.1 88.1 102.1 102.1 102.1
molar volume/(cm3·mol-1) 82 98 115 115 115
boiling point/°C 57.8 77 89 101.6 99
saturated vapor pressure at 298K/(kPa) 28.85 12.61 8.09 4.44 4.97
dipole moment/D 1.68 1.78 3.01 1.78 1.7
molar polarizability/(cm3·mol-1) 4.23 5.33 6.43 6.44 6.44
density/(kg·m-3) 922 888 877 863 878
Tab.2  Physico-chemical properties of adsorbates
Fig.1  adsorption isotherms of five esters vapors on ND-100 fitted by Langmuir, Freundlich and DA models at 303K, 318K, and 333K: (a) methyl acetate, (b) ethyl acetate, (c) isopropyl acetate, (d) propyl acetate, and (e) ethyl propionate
adsorbates parameters
q0 /(mL·g-1) r E/(kJ·mol-1) R2
methyl acetate 0.617 1.122 8.62 0.992
ethyl acetate 0.573 1.139 10.18 0.998
isopropyl acetate 0.589 1.017 11.64 0.995
propyl acetate 0.571 1.122 11.75 0.993
ethyl propionate 0.587 1.282 11.34 0.975
Tab.3  Fitting parameters of adsorption characteristic curves for ester VOCs on ND-100
Fig.2  Adsorption characteristic curves of five esters vapors on ND-100 fitted by DA model: (a) methyl acetate, (b) ethyl acetate, (c) isopropyl acetate, (d) propyl acetate, and (e) ethyl propionate
Fig.3  Esters’ physico-chemical properties vs parameter E in DA equation. (Physico-chemical properties: boiling point, saturated vapor pressure at 298K, molecular weight, molar volume, dipole moment and molar polarizability)
Fig.4  Plots of adsorbed volume (qv) vs. adsorption potential density (?/Vm) for methyl acetate, ethyl acetate and ethyl propionate onto ND-100 at 318K
Fig.5  Comparison of the predictive and experimental adsorbed volume of ester vapors onto ND-100: (a) methyl acetate, ethyl acetate and ethyl propionate at 303K and 333K; (b) isopropyl acetate and propyl acetate at 303K, 318K and 333K
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