TY - JOUR
T1 - A comparative adsorption study of β-naphthol on four polymeric adsorbents from aqueous solutions
AU - Huang, Jianhan
AU - Yuan, Bin
AU - Wu, Xiaofei
AU - Deng, Shuguang
N1 - Funding Information:
Jianhan Huang thanks to the National Natural Science Foundation of China (No. 21174163), the Shenghua Yuying Project of Central South University, the Natural Science Foundation of Hunan Province (11JJ5007), the Science and Technology Project of Hunan Province (2011SK3256) for the financial support, he also needs to appreciate China Scholarship Council for supporting his visit to New Mexico State University.
PY - 2012/8/15
Y1 - 2012/8/15
N2 - Adsorptive removal of aromatic compounds from aqueous solutions by polymeric adsorbents has attracted many concerns in recent years. A comparative adsorption study including equilibria, kinetics and column dynamics of β-naphthol from aqueous solutions was carried out using two hypercrosslinked polymeric adsorbents (HJ-1 and TEPA) we developed and two commercial polymeric adsorbents (XAD-4 and XAD-7). The adsorption isotherms could be well described by the Freundlich equation, and the adsorption equilibrium capacities of β-naphthol followed an order of q e(TEPA)>q e(HJ-1)>q e(XAD-4)>q e(XAD-7). The isosteric adsorption enthalpies on HJ-1 and TEPA decreased with increasing adsorption fractional loading, while a constant enthalpy was observed for XAD-4 and XAD-7, implying that HJ-1 and TEPA had a heterogeneous surface while XAD-4 and XAD-7 possessed a homogenous surface. The surface energetic heterogeneity of HJ-1 and TEPA could be well characterized by the Do's model. The adsorption kinetics were fitted by both pseudo-first-order and pseudo-second-order rate equations, and the intra-particle diffusion was found to be the rate-limiting step. The adsorption breakthrough data were well correlated by the Thomas and Clark models, and the dynamic capacities for TEPA, HJ-1, XAD-4 and XAD-7 adsorbents were calculated to be 341.7, 321.6, 268.0 and 173.8mg/g dry resin, which were within 90% of the corresponding equilibrium capacities obtained in the batch experiments.
AB - Adsorptive removal of aromatic compounds from aqueous solutions by polymeric adsorbents has attracted many concerns in recent years. A comparative adsorption study including equilibria, kinetics and column dynamics of β-naphthol from aqueous solutions was carried out using two hypercrosslinked polymeric adsorbents (HJ-1 and TEPA) we developed and two commercial polymeric adsorbents (XAD-4 and XAD-7). The adsorption isotherms could be well described by the Freundlich equation, and the adsorption equilibrium capacities of β-naphthol followed an order of q e(TEPA)>q e(HJ-1)>q e(XAD-4)>q e(XAD-7). The isosteric adsorption enthalpies on HJ-1 and TEPA decreased with increasing adsorption fractional loading, while a constant enthalpy was observed for XAD-4 and XAD-7, implying that HJ-1 and TEPA had a heterogeneous surface while XAD-4 and XAD-7 possessed a homogenous surface. The surface energetic heterogeneity of HJ-1 and TEPA could be well characterized by the Do's model. The adsorption kinetics were fitted by both pseudo-first-order and pseudo-second-order rate equations, and the intra-particle diffusion was found to be the rate-limiting step. The adsorption breakthrough data were well correlated by the Thomas and Clark models, and the dynamic capacities for TEPA, HJ-1, XAD-4 and XAD-7 adsorbents were calculated to be 341.7, 321.6, 268.0 and 173.8mg/g dry resin, which were within 90% of the corresponding equilibrium capacities obtained in the batch experiments.
KW - Adsorption
KW - Column dynamics
KW - Equilibria
KW - Isosteric adsorption enthalpy
KW - Kinetics
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U2 - 10.1016/j.jcis.2012.05.022
DO - 10.1016/j.jcis.2012.05.022
M3 - Article
C2 - 22658355
AN - SCOPUS:84862836145
SN - 0021-9797
VL - 380
SP - 166
EP - 172
JO - Journal of Colloid And Interface Science
JF - Journal of Colloid And Interface Science
IS - 1
ER -