Ultrasonic-assisted removal of cationic and anionic dyes residues from wastewater using functionalized triptycene-based polymers of intrinsic microporosity (PIMs)

Abstract In this work, a series of hypercrosslinked polymers intrinsic microporosity (HCP-PIMs), namely nitro-triptycene (TRIP-NO 2 ), amino-triptycene (TRIP-NH sulfonated-triptycene (TRIP-SO 3 H) and hydrocarbon-triptycene (TRIP-HC), are employed for the adsorption organic dyes from wastewater. The materials show efficient removal cationic (malachite green, MG) anionic (methyl orange, MO) dyes. parameters herein investigated include initial pH, adsorbate concentration contact time, with aim to elucidate their effect on process. Furthermore, kinetic isotherms studied, findings suggest results fit well pseudo-second-order kinetics Langmuir model. reported maximum capacity is competitive all tested polymers. More specifically, TRIP-SO H TRIP-HC exhibit adsorptions ~ 303 270 mg g −1 MG MO, respectively. selectivity toward assessed by mixing two dyes, showing that completely removes both species, whereas TRIP-NO , TRIP-NH an enhanced MG, compared MO. type water performing ultrasonic-assisted experiments, using in presence either tap or seawater. competing ions concentrations evaluated ICP-MS. Our study shows does not have detrimental polymers, whereas, seawater, performance MO proved be more stable than H, which probably due larger ions. Comparison between magnetic stirring demonstrates former exhibits greater efficiency. This seems rapid mass transfer, driven formation high velocity micro-jets, acoustic microstreaming shock waves, at polymer surface. Reusability studies good stability up five adsorption–desorption cycles.