CB-FC复合材料的制备及其对甲苯吸附性能研究

Study on preparation of CB-FC composite and its adsorption for toluene

以稻壳炭为碳质前躯体、淀粉为粘结剂、聚氨酯泡沫为模板,制备泡沫碳(FC)材料;以FC和葡萄糖为原料,采用生物质水热法制备碳球-泡沫碳(CB-FC)复合材料。通过全自动比表面积及孔径分析仪、扫描电子显微镜、X射线衍射等分析测试方法,将CB-FC复合材料与FC材料进行对比,研究CB-FC复合材料对甲苯溶液的吸附性能,通过吸附动力学曲线和吸附等温曲线探讨FC与CB-FC复合材料的吸附机理。结果表明:CB-FC复合材料具有丰富的孔洞结构,以中孔和微孔为主;生物质水热反应生成的葡萄糖碳球主要集中在FC材料表面及其大孔孔洞处,增加了中孔的比表面积,缩小了大孔的比表面积,且不影响FC材料的晶型结构;吸附等温线符合Langmuir等温吸附模型,以准二级动力学方程描述2种材料对甲苯水溶液的吸附过程,经拟合计算得到单位质量CB-FC复合材料的平衡吸附量为288.18mg/g,比FC材料提高了51.9%左右。

The foamed carbon material(FC)was prepared by using rice shell charcoal as carbonaceous precursor,starch as binder and polyurethane foam as template.Glucose carbon ball-foam carbon composite(CB-FC)was prepared by the biomass hydrothermal method using foam carbon and glucose as raw materials.BET-SEM,XRD and so on were used to compare CB-FC with FC to study the adsorpt properties to the toluene solution.The adsorption mechanism of FC and CB-FC was discussed by adsorption kinetic curve and adsorption isotherm curve.The results showed that CB-FC had a well-developed pore structure with mesopores and micropores.The carbon balls produced by the heat treatment of water heat mainly focused on the surface of foamed carbon and the pores of macropores,which increased the surface area of pores.The specific surface area of macroporous was reduced and the crystal structure of foamed carbon was not affected.The adsorption isotherm was in accordance with the Langmuir isothermal adsorption model.The adsorption process of liquid toluene aqueous solution was described by the quasi-second order kinetic equation.The maximum adsorption capacity of CB-FC was 288.18 mg/g,which was about 51.9%higher than that of FC.