Porous Adsorbents Cross-Linked with Waste Polystyrene Foam and 3,3′,4,4′-Biphenyltetracarboxylic Acid Dianhydride for the Effective Removal and Enrichment of Cationic Dyes AITranslate

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DOI：https://doi.org/10.1021/acsapm.3c01302

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Postconsumer solid waste has received wide attention in the development of raw materials for innovative products. In this paper, waste polystyrene (WPS) foam was employed as a starting material to react with 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) to synthesize a series of hyper-cross-linked polymers (HPB-s). The maximum adsorption capacities of the hyper-cross-linked adsorbents were 3082.2 and 3279.4 mg g–1 for malachite green (MG) and safranine T, respectively. The kinetics and isotherms were more consistent with the pseudo-second-order and Freundlich models, and the thermodynamic data indicated that the adsorption process was heat-absorbing and spontaneous. Furthermore, HPB-2 still maintained a complete shape and a high adsorption capacity after five adsorption–desorption cycles. More importantly, the adsorption studies for three binary mixed dye systems showed that HPB-2 exhibited efficient and selective adsorption behavior toward cationic dyes from water. The present work demonstrates that HPB-2 has promising potential in purifying dye wastewater.