Efficient antibiotic wastewater treatment via interfacial water evaporation based soot-coated conjugated microporous polymer hollow microspheres

•A multifunctional self-floating photothermal materials (CS-CMPsHM) were synthesized.•The CS-CMPsHM are capable of adsorption antibiotics by interfacial steam generation.•The improved adsorption was due to specific π-π electron-donor–acceptor interactions.•Wastewater purification was achieved in simulated and actual water samples.•The inhibitory effect of the collected water on plant growth was significantly reduced.