The　incorporation　of　polar　functionalgroups　into　UiO-66　permits　control　over　the　pore　sizeand　environment,resulting　in　increased　interaction　between　UiO-66　derivatives　andCO(2).　Ultimately,　this　modification　enhances　the　separationperformance　of　trace　levels　of　CO2.　The　selective　capture　of　low-concentration　CO2　fromair　or　confined　spaces　remains　a　great　challenge.　In　this　study,　variousfunctional　groups　were　introduced　into　UiO-66　to　generatefunctionalized　derivatives　(UiO-66-R,　R　=　NO　(　2　),　NH　(　2　),　OH,　and　CH　(　3　)),　aiming　at　significantly　enhancing　CO2　adsorption　andseparation　efficiency.　More　significantly,　UiO-66-NO　(　2　)　and　UiO-66-NH　(　2　)　with　high　polarity　exhibit　exceptional　CO2　affinityand　optimal　separation　characteristics　in　mixed　CO2/O-2/N-2　(1:21:78).　In　addition,　the　impressive　stabilityof　UiO-66-NO　(　2　)　and　UiO-66-NH　(　2　)　endows　them　with　excellent　recycling　stability.The　effective　adsorption　and　separation　performances　demonstratedby　these　two　functional　materials　suggest　their　potential　as　promisingphysical　adsorbents　for　capturing　low-concentration　CO2.