An increasing level of carbon dioxide (CO2) in the atmosphere has ultimately resulted in global warming and climate change. The high-performance activated carbon (AC-WL) was synthesized from walnut shell, a low-cost biomass by-product, by physical activation using a tube furnace. The adsorption behavior of CO2 from the CO2/N2 mixture was investigated using a fixed bed. The surface and morphological characterizations of the produced activated carbons were measured using a BET analyzer and a scanning electron microscope (SEM). The effect of temperature, flow rate, CO2 level, and partial pressure on breakthrough behavior was analyzed, and the adsorption response presented in terms of breakthrough point and adsorption capacity. The breakthrough and saturation periods vary significantly with change in temperature. The steepness of the breakthrough curves signifies good utilization of adsorbent capacity at breakthrough point. The increase in temperatures and flow rates lead to an increase in the length of mass transfer zone. The adsorption capacity of 1.58 mmol/g was obtained at 1.30 bars and 293 K with higher capacity utilization factor of 0.8492.These results suggest that the walnut-based activated carbon is favorable for capturing CO2.

中文翻译：

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从核桃壳生物质中捕获二氧化碳的高性能活性炭的合成与表征。

大气中二氧化碳（CO2）含量的增加最终导致了全球变暖和气候变化。高性能活性炭（AC-WL）是由核桃壳（一种低成本的生物质副产品）通过使用管式炉进行物理活化而合成的。使用固定床研究了CO2 / N2混合物对CO2的吸附行为。使用BET分析仪和扫描电子显微镜（SEM）测量所产生的活性炭的表面和形态特征。分析了温度，流速，CO2水平和分压对突破行为的影响，并以突破点和吸附容量表示了吸附反应。突破和饱和期随温度变化而显着变化。穿透曲线的陡度表示在穿透点处吸附剂容量的良好利用。温度和流速的增加导致传质区长度的增加。在1.30 bar和293 K下的吸附容量为1.58 mmol / g，容量利用率为0.8492，表明核桃基活性炭对捕集CO2有利。