A porous fluorocarbon sorbent is synthesized from rice husk (RH) in a microwave reactor and then evaluated for the adsorption of different gases (CH₄, CO₂, and N₂). The fluorocarbon is characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), Raman spectroscopy, Thermal gravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). Significant enhancement in the surface area of activated carbon material is obtained from 29 to 531 m² g⁻¹ after removing naturally present silica in RH. Results reveal that rice husk fluorocarbon (RHF) has a higher adsorption affinity for CO₂ (1.8 mmol g⁻¹) than that of the sulfonated rice husk (RHS) (1.4 mmol g⁻¹) at 298 K while the corresponding separation factor of CO₂/CH₄ is 4 and 3; respectively. Higher separation factors of 12 and 10 are observed for the binary system of CO₂/N₂, respectively. Quantum chemical density functional theory (DFT) calculations agree with the experimental observations. They reveal that RHF exhibits strong columbic interactions with considerable interaction energies of −87.85, −76.75, and −55.65 kcal mol⁻¹ with CO₂, CH₄, and N₂ gases; respectively. Finally, the adsorption process results are highly reproducible, with a small decrease in the adsorption capacity of less than 5% after repeated trials.

中文翻译：

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来自稻壳的多孔碳氟化合物用于有效分离气体

在微波反应器中由稻壳 (RH) 合成多孔碳氟化合物吸附剂，然后评估对不同气体（CH ₄、CO ₂和 N ₂）的吸附。碳氟化合物通过傅里叶变换红外光谱 (FTIR)、X 射线衍射 (XRD)、Brunauer-Emmett-Teller (BET)、拉曼光谱、热重分析 (TGA) 和 X 射线光电子能谱 (XPS) 进行表征。去除RH中天然存在的二氧化硅后，活性炭材料的表面积从29增加到531 m ² g ^-1。结果表明，稻壳碳氟化合物 (RHF) 对 CO ₂ (1.8 mmol g ^-1) 比磺化稻壳 (RHS) (1.4 mmol g ^-1 ) 在 298 K 时的分离系数高，而相应的 CO ₂ /CH ₄分离系数为 4 和 3；分别。对于 CO ₂ /N ₂二元系统，分别观察到更高的分离因子 12 和 10 。量子化学密度泛函理论 (DFT) 计算与实验观察一致。他们揭示了 RHF 表现出强烈的库伦相互作用，与 CO ₂、CH ₄和 N _{2 的}相互作用能量为 -87.85、-76.75 和 -55.65 kcal mol ^-1气体；分别。最后，吸附过程的结果具有高度可重复性，经过反复试验，吸附容量小幅下降不到 5%。