This　study　developed　a　method　to　fabricate　a　surface-oxidized　rigid　carbon　foam　(ORCF)　with　hierarchical　macro-nanoporous　structure　via　KOH　activation　of　the　carbon　foam　with　two　kinds　of　macropores　followed　by　HNO　3　hydrothermal　oxidation.　The　structures　of　the　prepared　ORCF　were　characterized　using　scanning　electron　microscopy,　transmission　electron　microscopy,　X-ray　diffraction,　Fourier　transform　infrared　(FTIR)　spectra,　X-ray　photoelectron　spectroscopy,　and　N　2　adsorption-desorption　analyzer.　Results　demonstrate　that　the　ORCF　possesses　a　fluffy　and　porous　structure　with　rich　oxygen-containing　groups.　There　are　numerous　through-holes　on　its　pore　surfaces　connected　with　two-level　macropores　forming　hierarchical　macroporous　channels.　Meanwhile,　the　ORCF　remains　a　good　bulk　structure　with　a　compression　strength　of　0.74　MPa　at　a　bulk　density　of　0.09　g　cm　???3　.　Batch　adsorption　experiments　for　malachite　green　(MG)　and　Pb　2　+　were　studied　through　the　single　variable　method　to　investigate　the　effects　of　different　initial　conditions　on　its　adsorption　process.　The　ORCF　has　maximum　adsorption　capacities　for　MG　and　Pb　2　+　of　587.68　mg　g　???1　and　157.80　mg　g　???1　with　high　partition　coefficients　of　17.41　mg　g　???1　??M　???1　and　14.86　mg　g　???1　??M　???1　,　respectively.　The　experimental　data　are　suitable　for　Langmuir　isotherm　and　Pseudo-secondorder　kinetic　models,　which　correspond　to　monolayer　chemisorption.　Thermodynamic　analysis　indicates　that　the　adsorption　process　is　spontaneous　and　endothermic.　Moreover,　the　removal　percentages　of　MG　and　Pb　2　+　by　the　ORCF　could　remain　above　90%　after　five　cycles,　implying　that　the　ORCF　is　an　efficient　adsorbent　with　good　adsorption　ability　and　cycling　stability.　??　2022　Published　by　Elsevier　Ltd　on　behalf　of　The　editorial　office　of　Journal　of　Materials　Science　&　Technology.