Double-imprinted mixed matrix membranes with polydopamine-induced nanocomposite for selective recognition and separation applications

Herein, according to the polydopamine (PDA)-based imprinting and thermal-induced imprinting methods, we reported on the development and applications of double-layer-imprinted mixed matrix membranes (DI-MMMs) through a dual-imprinted strategy, thereinto, the tetracycline (TC), one of the pollution-intensive pharmaceutical and personal care products , was chosen as template molecule. As to the first-TC-imprinted layer, the blended PDA-based TC-imprinted activated carbon (AC) and SiO 2 were both used for the preparation of membrane. Next, κ-carrageenan-modified graphene oxide (GO) nanosheets would be regarded as the surface-loaded layer to support the thermal-induced imprinting synthesis (second-TC-imprinted layer). Importantly, high adsorption capacity at around at 106.44 mg/g and fast adsorption rate (within 60 min) had been successfully obtained. Importantly, permselectivity rates ( β ) of our imprinting membranes were obtained as 3.60, 3.33 and 3.51, respectively. Overall, based the practical selective separation and scalability analysis, we believed that the as-prepared DI-MMMs with high-intensitive recognizability and permeability of template molecule would provide a possibility for breaking the permeability-selectivity trade-off of molecularly imprinted membrane materials.