<p>The introduction of conjugated building blocks can improve the adsorption performance of hyper-crosslinked polymers (HCPs). Pyrene was introduced into the HCPs using chloromethylated polystyrene as the precursor, facilitating the hyper-crosslinking through a Friedel–Crafts reaction to finally synthesize an efficient adsorbent named CaHe-2. 1-Naphthylamine and 1-naphthol could be rapidly removed by CaHe-2 within 20&#xa0;min with high removal efficiencies of 93.8% and 90.6%. The maximum adsorption capacity of CaHe-2 reached 171.71&#xa0;mg&#xa0;g⁻¹ for 1-naphthylamine, exceeding most of previously reported adsorbents in, and 184.86&#xa0;mg&#xa0;g⁻¹ for 1-naphthol, which is the maximum value reported so far. The removal efficiencies of CaHe-2 still remained &gt; 98% after five cycles. This conjugation enhancement resulted in drastic changes in the 1-naphthylamine and 1-naphthol adsorption property of porous polymers, displaying a new strategy for creating HCPs with high adsorption capacities.</p> Graphical Abstract <p></p>