Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE A novel phenidone-functionalized hyper-cross-linked polymer was synthesized via nucleophilic substitution and Friedel-Crafts alkylation for salicylic acid adsorption, reaching a q
max of 210.1 mg/g at 308 K. The acceptable adsorption performance relies on the synergy of π–π stacking, hydrogen bonding, van der Waals forces, and acid–base interactions, providing a new aqueous adsorption approach.

ABSTRACT
Functionalized hyper-cross-linked polymers are widely acknowledged as high-performance adsorbents for organic-laden wastewater owing to their specific affinity toward organic contaminants. Herein, phenidone-functionalized hyper-cross-linked resins (PND-HCMPs) were fabricated from chloromethylated polystyrene resins (CMPs) via sequential nucleophilic substitution, followed by Friedel-Crafts alkylation reactions. The adsorption behavior of PND-HCMPs toward salicylic acid (SA) was systematically investigated. Batch adsorption results revealed that the fitted maximum adsorption capacity of PND-HCMPs for SA reached 210.1 mg/g at 308 K, and equilibrium isotherm data were well fitted to the Freundlich model (R
2 = 0.9978). Remarkably, adsorption equilibrium was achieved within 60 min, and kinetic data were excellently described by the pseudo-second-order model (R
2 = 0.9965). Adsorption was facilitated under acidic conditions, and the SA removal efficiency reached 99.1%. Besides, the coexisting inorganic salt Na2SO4 in tap water facilitated SA adsorption via the salting-out effect. Cyclic regeneration experiments verified the acceptable recyclability of PND-HCMPs. Collectively, PND-HCMPs show competent SA removal performance in aqueous solutions and are applicable for practical organic wastewater treatment.