Abstract
The comparative adsorption of o-nitrophenol, m-nitrophenol and p-nitrophenol onto a macroporous polymeric adsorbent (Amberlite XAD-4) and a hypercrosslinked polymeric adsorbent (NJ-8) was investigated. Adsorption equilibrium isotherms were measured by batch equilibration over the temperature range 283-323 K, and two kinds of isotherm model (Langmuir and Freundlich) provided the best fit of the experimental data. The adsorption capacity for each adsorbate on NJ-8 was ca. twice that on Amberlite XAD-4, which is explained by the micropore structure and stronger donor-acceptor interaction of NJ-8 resin. Mini-column experiments showed that NJ-8 resin exhibited the longest breakthrough time. The enthalpy of adsorption was estimated from the temperature dependence of adsorption.
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