According to the planar structure and the small molecular size of theophylline (TP), a novel hyper-cross-linked polymeric adsorbent with high microporous surface area (denoted GQ-06) was synthesized and its adsorption to TP was explored from aqueous solution. The results showed that GQ-06 possessed a high microporous surface area of 1223 m2/g and bimodal pore size distributions. The equilibrium adsorption capacity of TP on the five polymeric adsorbents followed an order as: XAD-4 <NDA-88 <H103 <NDA-150 <GQ-06, which was in agreement with the order of the microporous surface area. T...