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Photothermal-assisted activation of peroxymonosulfate (PMS) is an effective way to promote the advanced catalytic oxidation performance. However, leaching of metal ions is a drawback for currently used metal-based catalysts, which limits their applications for water treatment. Therefore, it is important to develop high-efficient non-metal catalysts for photothermal-assisted PMS activation. Carbon nitride(CN) loaded with FeO_<i>x</i> nanoparticles (FeO_<i>x</i>/CN) were synthesized by the gelation-pyrolysis method. The as-prepared FeO_<i>x</i>/CN catalysts were used to eliminate Rhodamine B (RhB) using the Fenton-like reaction by photothermal-assisted PMS activation. The crystalline structures, morphologies and light adsorption properties of the obtained nanocomposites were analyzed by using X-ray diffractometer, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, N₂ adsorption-desorption and UV-vis spectrophotometer. The results show that the removal rate of RhB by CN/FeO_<i>x</i>/PMS system can reach 98.0% under the condition of near neutral (pH=6) and photothermal(40 ℃ water bath and <i>λ</i>>420 nm visible-light irradiation) synergistic auxiliary reaction for 30 min. The trapping experiments demonstrate that holes (<i>h</i>⁺) and hydroxyl radicals (OH·) are major active species during the PMS activation process.