Molecular-sieve porous graphene as a steady phase of gas chromatography column for dissociation and measurement of nitrous oxide, carbon dioxide and gaseous hydrocarbons

摘要: A novel gas chromatography stationary phase is introduced for efficient separation of air, nitrous oxide, methane, carbon dioxide, ethane, propane, butane and pentane. Porous graphene was synthesized through a cost-effective approach. The structure porous texture the prepared were evaluated by field-emission scanning electron microscopy nitrogen adsorption/desorption isotherms. results confirmed high porosity surface area graphene. Also, isotherms showed highly microporous structures with average pore size being < 2 nm, which has contribution in molecules separation. exhibited an excellent performance efficiency compared multi-wall, single-wall nanotube activated carbon. In addition, common problems GC packed column nanomaterials, such as avoiding use long column, flow rate reduction, agglomeration, packing compression back-pressure, completely addressed; therefore, order to overcome these fabricate 1.8″, stainless steel tubes used three lengths 10, 20, 30 cm. After testing, 30 cm determination entered gases continued work. this experiment, two types samples used. first sample contains dioxide oxide at 40 °C, second pentane containing hydrocarbons temperature action 40–200 °C. analytical demonstrated superior steady some dissociation 40 °C good preservative C1–C5 (while using ramp up 6 °C/min) range also resolution, wide linear acceptable repeatability studying mixture. obtained detection limits lower than 4.2 ppm.