Hydrophobic porous polymer containing isoxazoline and siloxane groups for 2,4,6-trinitrotoluene (TNT) adsorption via synergistic effect of Lewis acid-base, dipole-π, and π-π interactions

•Click polymerization was used for efficient adsorption of TNT.•Synergistic effect of Lewis acid-base, dipole-π, and π-π interactions was applied.•The maximum adsorption capacity at 25°C was up to 90.7 mg/g within 3 h.•The porous polymer was reversible and could be reused. A series of hydrophobic porous polymer containing isoxazoline and siloxane groups were successfully prepared via catalyst-free click polymerization and freeze-drying technology. In addition to hydrophobicity, synergistic effect of three molecular aborption interactions, namely point-to-point Lewis acid-base, point-to-face dipole-π, and face-to-face π-π interactions, endowed the resulting porous polymer with good 2,4,6-trinitrotoluene (TNT) adsorption efficiency from wastewater. At the same time, the adsorption efficiency of the resulting porous polymer in different natural/polluted water samples was similar to those in laboratory, and about 80% of the initial adsorption capacity remained after five adsorption-desorption cycles. The results showed that hydrophobic porous polymer containing isoxazoline and siloxane groups is a promising adsorbent for the treatment of TNT wastewater.