Selective dye adsorption and metal ion detection using multifunctional silsesquioxane-based tetraphenylethene-linked nanoporous polymers
Multifunctional hybrid fluorescent porous materials have been prepared by Friedel-Crafts reaction of octavinylsilsesquioxane (OVS) with tetraphenylethene (TPE). These hybrid porous polymers possess high surface areas up to 1910 cm2 g-1, bimodal pore structures with micropores centered at ≈ 1.4 nm and mesopores centered at ≈ 4.5 nm, respectively. They show a moderate CO2 adsorption capacity of 6.25 wt% (1.42 mmol g-1) at 273 K/101 Kpa. Remarkably, they exhibit highly size-selective adsorption of dye of 1666 mg g-1 for Rhodamine B (RB), 1040 mg g-1 for Congo red (CR) and 862 mg g-1 for Crystal violet (CV), respectively. Furthermore, the incorporation of tetraphenylethene unit induces higher fluorescence (λem = 490 nm) and high sensitivity for Fe3+, Cu2+ and Ru3+, especially for Fe3+ with KSV =140k M-1 observed. They are very promising for multiple applications in dye separation and sensor, etc.