Synthesis of Hyper-Crosslinked Polymers From 9-Bromophenanthrene and Octavinylsilsesquioxane for High Adsorption of Rhodamine B, Congo Red and I2 Vapor Assisting With C?Br⋯π Interaction

Disposal of dye-contaminated wastewater has become an imperative issue. Synthesis of novel materials for larger-capacity removal of those contaminants assisting by special interaction is a significant challenge. In this paper, a series of hyper-crosslinked poly 9-bromophenanthrene hybrids (HCPs) were synthesized by combination of 9-bromophenanthrene (9BP) and octavinylsilsesquioxane (OVS) via Friedel-Crafts alkylation reaction. The synthesized HCPs were well characterized. The results illustrated that HCPs were porous polymer hybrids consisting of micropores and mesopores with the apparent surface areas ( S BET ) in range of 980.0–1010.6 m 2 g −1 , and the micropore and mesopore widths located at 1.42 and 4 nm. Dye adsorption disclosed that the adsorbed amounts of rhodamine B (RB) and Congo red (CR) on HCP-2 respectively arrived at 2646.0 ± 37.4 and 1550.0 ± 38.5 mg g −1 , ascribing to the interactions of pore filling, hydrogen bonds, π  π stacking, electrostatic attraction, especially the C  Br⋯π interaction between the resulting polymers and the dye molecules of RB and CR. Moreover, HCP-2 exhibited larger adsorbed amount of iodine vapor arriving at 179.9 ± 2.6 wt%. This work provided an innovative strategy to design new adsorbents for larger-amount removal of contaminants from the environment.