Using flax stem and ferrous sulfate, a composite porous carbon material was prepared by means of high‐temperature roasting and a one‐step process in a muffle furnace. The samples were characterized using X‐Ray diffraction (XRD) and Scanning electron microscopy (SEM), and the effects of ferrous sulfate concentration, carbonization temperature, and pH values of Cr(VI) aqueous solution on the removal performance of Cr(VI) were studied. XRD and SEM analysis showed that the prepared samples were amorphous porous carbon loaded with FeS/Fe₂O₃/Fe₃O₄. High FeSO₄ impregnation concentration, high carbonization temperature, and a low pH value of Cr(VI) aqueous solution were beneficial for Cr(VI) removal. When pH = 2, the amount of Cr(VI) removal was 99.93 mg/g by the sample obtained from 1 g flax powder impregnated in 4.5 mmol FeSO₄/40 mL H₂O solution and calcined for 2 hr at 800°C.

中文翻译：

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FeS /氧化铁复合材料和亚麻茎基多孔碳的制备及其对Cr（VI）的去除能力

使用亚麻茎和硫酸亚铁，通过高温焙烧和马弗炉中的一步法制备了复合多孔碳材料。使用X射线衍射（XRD）和扫描电子显微镜（SEM）对样品进行表征，以及硫酸亚铁浓度，碳化温度和Cr（VI）水溶液的pH值对Cr（VI）去除性能的影响被研究了。X射线衍射（XRD）和扫描电镜（SEM）分析表明，所制备的样品为负载有FeS / Fe ₂ O ₃ / Fe ₃ O _4的非晶态多孔碳。高FeSO ₄浸渍浓度，较高的碳化温度和较低的Cr（VI）水溶液pH值均有助于去除Cr（VI）。当pH值= 2，Cr量（VI）去除率为99.93毫克/克通过从4.5毫摩尔的FeSO浸渍1克亚麻粉末获得的样品₄ / 40mL的ħ ₂ O解决方案，并在800℃下煅烧2小时。