Stimuli-responsive supramolecular polymer network based on bi-pillararene for efficient multiple organic dye contaminants adsorption
A novel supramolecular polymer networks gel (NT) based on bi-pillararene, which could adsorb and separate organic dyes were efficiently constructed. First, a novel supramolecular gelator, NBP5 (host), and a tripodal guest, TG (guest), were successfully designed and synthesized. Then, host NBP5 and guest TG could construct a stable supramolecular polymer networks gel, NT, via π-π interactions, hydrogen bonding interactions and host-guest interactions in DMSO/H2O solution. Interestingly, NT shows multi-responsiveness toward outer stimuli, such as temperature, mechanical, concentration, pH and competitive guest. More importantly, NT could carry out adsorption and separation of organic dyes such as methylene blue, crystal violet , methyl orange, orange I, sudan I and sudan Ⅱ by the complex intermolecular interactions. The adsorption rates of this gels for dyes are in the range of 83.15%-97.56%, indicating nice adsorption property. Moreover, the xerogel of NT could desorp in ethanol solution, showing good recyclability. The multi-responsiveness and adsorption separation properties are based on the multi-interaction sites that we rationally introduced into the NT. Therefore, it is a convenient way for the preparation of supramolecular polymer networks-based multiple functional smart materials.