Graphene oxide (GO), as a two-dimensional carbon nano-material which is generated from graphite oxide, has engen-dered tremendous attention in the area of materials science andnanotechnology owing to its fascinating physical properties,such as excellent mechanical, electrical, thermal, and opticalproperties.1–3GO contains a range of reactive bearing hydroxyl,carboxyl, and epoxide functional groups on their basal planes,which renders it a good candidate for use in the aforementionedapplications through chemical functionalizations.4,5Addition-ally, due to its ultrahigh surface area and excellent chemicalproperties, GO has been explored as a supporting material ofadsorbents for the preconcentration of small molecules.6,7Eventhrough these merits, it is difficult to use GO directly to fabri-cate uniform separation matrix and to retain it in the column,especially under high pressure in chromatographic systems. Toavoid the abovementioned problems and still take advantage ofthe specic features of GO, fabrication of GO functionalizedmonolithic column is a good choice,8among which monolithiccolumns emerged in the 1990s and have been widely used inmany areas owing to their easy preparation, excellent perme-ability, and fast convection mass transfer. In our previousresearch, GO modied poly(glycidyl methacrylate-ethylenedimethacrylate) monolith was successfully synthesized basedon the amide reaction between amine-modied monolithiccolumn and carboxyl groups of GO. The obtained GO func-tionalized monolith exhibited good mechanical property andenrichment performance for the isolation of sarcosine fromhuman urine samples