Azolla biomass as a very fast growing fern was utilized to prepare hierarchically nanoporous activated carbons with high surface area and crystallinity. As-prepared activated carbons were characterized using powder X-ray diffraction (PXRD), Raman, Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS), N₂ sorption, scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HR-TEM). XRD and FTIR results confirmed that CaCO₃ which is naturally present in azolla biomass is responsible for crystallinity of the final materials and in collaboration with NaOH as activation agent led to high surface area nanoporous carbons. Activation process increased the specific surface area of the initial char from about 3 m² g⁻¹ to 2680 m² g⁻¹. Large ordered atomic layers domains of carbon were observed in HR-TEM. CO₂ adsorption capacity was investigated for the azolla-derived carbons which proved the high room temperature capture ability of near 7.18 mmol g⁻¹ at 1 bar and 12.5 mmol g⁻¹ at 20 bar. More significantly, extraordinary capacity of methylene blue uptake by about 4448 mg g⁻¹ has been observed in azolla-derived porous carbon which is the highest ever reported for water cleaning.

Azolla生物质作为快速增长的蕨类植物被用于制备具有高表面积和结晶度的分级纳米多孔活性炭。使用粉末X射线衍射（PXRD），拉曼光谱，傅立叶变换红外光谱（FTIR）和X射线光电子能谱（XPS），N ₂吸附，扫描电子显微镜（SEM）和高分辨率透射电子对制得的活性炭进行表征显微镜（HR-TEM）。XRD和FTIR结果证实，在偶氮生物质中天然存在的CaCO ₃负责最终材料的结晶，并与作为活化剂的NaOH协同作用产生高表面积的纳米孔碳。活化过程使初始炭的比表面积从约3 m ²  g增加到^-1至2680 m ²  g ^-1。在HR-TEM中观察到碳的大有序原子层域。研究了偶氮来源的碳的CO ₂吸附容量，证明了在1 bar下接近7.18 mmol g ^-1和在20 bar下为12.5 mmol g ^-1的高室温捕获能力。更重要的是，在偶氮来源的多孔碳中观察到了约4448 mg g ^-1的亚甲基蓝吸收能力，这是有史以来最高的水清洗记录。