中科院西北特色植物资源化学重点实验室/甘肃省天然药物重点实验室知识库

A series of novel organic–inorganic hybrid porous materials were synthesized using the method of suspension polymerization. As content of oleic acid-coated TiO₂ introduced increased, the surface area, pore volume, and average pore diameter increased, and meantime macropores appeared. The adsorption efficiencies of the porous materials for (−)-epigallocatechin gallate (EGCG) and caffeine (CAF) were enhanced, due to synergistic effect of surface area, pore volume, average pore diameter, and several driving forces such as charge induced force, π–π stacking, and hydrogen bond. Adsorption kinetic analysis indicated that pseudo-second-order kinetics can reasonably depict the adsorption process, and intraparticle diffusion became more obvious after a contact time of 30 min. Adsorption isotherm analysis indicated Freundlich isotherm could be used to describe the adsorption process. Charge induced force, π–π stacking, hydrogen bond, and sieving effect of pores were the main driving forces for the adsorption of EGCG and CAF by the organic–inorganic hybrid porous materials. This study will open possibility of expanding number and types of porous materials and provide assistance in tailoring corresponding physical–chemical properties, according to specific analytes.