Hyper-cross-linked porous polymers based on 1, 1, 1-trimethyl-3, 3, 3-triphenyldisiloxane and their applications in water treatment

A series of new hyper-cross-linked porous polymers (HCP-TTDs) were successfully prepared by the Friedel–Crafts alkylation reaction of 1, 1, 1-trimethyl-3, 3, 3-triphenyldisiloxane and formaldehyde dimethyl acetal (FDA). Nitrogen adsorption–desorption test showed that the BET specific surface areas of them were between 989 and 1285 m 2  g −1 . Furthermore, the prepared HCP-TTDs exhibited excellent adsorption capacities of organic dyes in aqueous solution (Malachite green: 2346 mg g −1 , Congo red: 2052 mg g −1 , and Rhodamine B: 1938 mg g −1 ). The adsorption behavior was well agreed with the pseudo-second-order model and Langmuir model. Additionally, the functionalization of HCP-TTDs could be realized by the condensation reaction of 3-(2-aminoethylamino)propyl-dimethoxymethylsilane (AAMD) and the alkali-treated porous polymer. The functionalized HCP-TTD displayed high adsorption performance for chromium ion, and the adsorption capacity was up to 76.9 mg g −1 , which is higher than many reported adsorbents. Therefore, HCP-TTDs are promising candidates for the removal of dyes and chromium ion from wastewater. Graphical abstract