A comparative adsorption study of beta-naphthol on four polymeric adsorbents from aqueous solutions

作者：Huang, Jianhan^*; Yuan, Bin; Wu, Xiaofei; Deng, Shuguang

来源：Journal of Colloid and Interface Science, 2012, 380(1): 166-172.

DOI：10.1016/j.jcis.2012.05.022

• Adsorption
• Equilibria
• Isosteric adsorption enthalpy
• Kinetics
• Column dynamics

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 beta-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 beta-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, XAD-4 and XAD-7 adsorbents were calculated to be 341.7, 321.6, 268.0 and 173.8 mg/g dry resin, which were within 90% of the corresponding equilibrium capacities obtained in the batch experiments.

• 出版日期2012-8-15
• 单位中南大学