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首页> 外文期刊>RSC Advances >Plant derived porous graphene nanosheets for efficient CO2 capture
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Plant derived porous graphene nanosheets for efficient CO2 capture

机译：植物来源的多孔石墨烯纳米片可有效捕获二氧化碳

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摘要

There is an urgent need for the mitigation of climate change through CO2 reduction technologies. In this work, we demonstrate a novel method for production of porous graphene-like nanosheets (PGLNS) from the lignocellulosic fiber of oil palm empty fruit bunches (EFB) by a thermal graphitization technique for efficient CO2 capture. We used a wide range of microscopic and spectroscopic techniques to provide insights into the morphological and structural characteristics of the synthesized PGLNS (with d-spacing of similar to 0.35 nm and pore size of < 1 nm) obtained from the EFB biomass. The PGLNS show excellent performance as adsorbents for post-combustion CO2 capture. At 25 degrees C and 1 bar pressure, the maximum CO2 uptake was 2.43 mmol g(-1) which is considerably higher than other competitive CO2 adsorbents, including zeolite, activated carbon and some metal organic frameworks. The selectivity of the PGLNS for CO2 over N-2 (SCO2/N-2 = 18.7), computed from single component isotherms at conditions pertinent to post-combustion applications, is also much higher than that of most of the previously reported adsorbents. Moreover, the significantly low isosteric heat of adsorption (similar to 21 kJ mol(-1)) revealed the possibility of desorbing CO2 and regenerating the PGLNS for their repeated use at a much lower energy penalty.
机译：迫切需要通过减少二氧化碳的技术来缓解气候变化。在这项工作中，我们演示了一种通过热石墨化技术从油棕空果束（EFB）的木质纤维素纤维生产多孔石墨烯状纳米片（PGLNS）的新方法，该方法可有效捕获二氧化碳。我们使用了广泛的显微镜和光谱技术，以深入了解从EFB生物质获得的合成PGLNS的形态和结构特征（d间距类似于0.35 nm，孔径小于1 nm）。 PGLNS作为燃烧后二氧化碳捕集的吸附剂表现出出色的性能。在25摄氏度和1巴的压力下，最大的CO2吸收量为2.43 mmol g（-1），大大高于其他竞争性CO2吸附剂，包括沸石，活性炭和某些金属有机骨架。根据与燃烧后应用相关的条件下的单组分等温线计算，PGLNS对N-2的CO2的选择性也远高于大多数先前报道的吸附剂。此外，极低的等排线吸附热（类似于21 kJ mol（-1））揭示了脱附CO2并再生PGLNS的可能性，以使其重复使用的能耗大大降低。

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