柚子皮多孔生物炭的制备及其对水中Cu(Ⅱ)的吸附性能研究

Preparation of Porous Biochar from Pomelo Peel and Its Adsorption Performance for Cu(Ⅱ)in Water

本文以农林废弃物柚子皮作为原料,将其高温碳化后活化制备得到多孔生物炭材料。利用扫描电子显微镜、X-射线粉末衍射仪、傅里叶变换红外光谱仪、比表面积分析仪对得到的柚子皮多孔生物炭的形貌与结构进行表征,并将其应用于含Cu(Ⅱ)废水的吸附研究。结果表明:活化后的柚子皮多孔生物炭具有明显的多孔结构,其在45℃下对pH值为6、浓度为20 mg·L^(-1)的Cu(Ⅱ)离子溶液的吸附率最高可达91.26%;柚子皮多孔生物炭对Cu(Ⅱ)的吸附过程符合拟二级动力学模型(相关系数R^(2)=0.979)和Langmuir模型(相关系数R^(2)=0.978)。上述结果表明,柚子皮多孔生物炭可作为一种新型污染废水治理材料使用。

In this paper,a porous biochar material was prepared from agroforestry waste pomelo peel through high-temperature carbonization and activation processes.The morphology and structure of porous biochar from grapefruit peel were characterized by scanning electron microscopy,X-ray powder diffraction,fourier transform infrared spectroscopy,and specific surface area analyzer.These biochar materials were applied to study the adsorption of copper(Ⅱ)from wastewater.The results showed that the activated pomelo peel porous biochar had obvious porous structure,and the adsorption rate was up to 91.26%under conditions of pH 6 and 20 mg·L^(-1) Cu(Ⅱ)ion solution at 45℃.The adsorption process of pomelo peel porous biochar on Cu(Ⅱ)ions conformed to the pseudo second-order kinetic model(R^(2)=0.979)and the Langmuir model(R^(2)=0.978).These results suggest that pomelo peel porous biochar has great potential as a new type of material for controlling pollution in wastewater treatment applications.