Abstract It is challenging to prepare biomass-based super activated carbon (SAC) simultaneously possessing a surface area larger than 2500 m2/g and a pore volume up to 2.2 cm3/g. In this research, SACs were prepared by impregnating coconut shell with H3PO4 at high impregnation ratio before suddenly heating them in CO2 flow. The SAC prepared at impregnation ratio of 3 displayed a specific surface area of 2763 m2/g, a total pore volume of 2.376 cm3/g, and a mesopore volume of 1.365 cm3/g. All these pore parameters ranked among the highest corresponding values reported for porous carbons. Because of the well-developed pore structure of this sample, its adsorption capacities for benzene, methanol, n-hexane and cyclohexane reached 1846, 1777, 1510, 1766 mg/g, respectively, all of which were high compared with the corresponding values previously reported for porous adsorbents. This sample also showed superior adsorption rate and excellent recyclability for the tested VOCs. Raising the impregnation ratio from 3 to 4 did not enhance the pore properties and VOC adsorption performance. This research provided a feasible route to manufacture biomass-based SAC which possessed simultaneously large surface area, superior pore volume, and high broad-spectrum VOC adsorption performance.

中文翻译：

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同时具有大表面积和超高孔容的微介孔活性炭可高效吸附各种VOC

摘要 制备同时具有大于 2500 m2/g 的表面积和高达 2.2 cm3/g 的孔体积的生物质基超级活性炭 (SAC) 具有挑战性。在这项研究中，SAC 是通过在高浸渍率下用 H3PO4 浸渍椰子壳，然后在 CO2 流中突然加热它们来制备的。以 3 的浸渍比制备的 SAC 的比表面积为 2763 m2/g，总孔体积为 2.376 cm3/g，中孔体积为 1.365 cm3/g。所有这些孔隙参数都属于多孔碳报告的最高相应值。由于该样品孔结构发达，对苯、甲醇、正己烷和环己烷的吸附量分别达到1846、1777、1510、1766mg/g，与先前报道的多孔吸附剂的相应值相比，所有这些值都很高。该样品还对所测试的 VOC 显示出优异的吸附率和出色的可回收性。将浸渍比从 3 提高到 4 并没有提高孔隙性能和 VOC 吸附性能。该研究为制备同时具有大表面积、优异孔容和高广谱VOC吸附性能的生物质基SAC提供了可行的途径。