羧基化改性有序介孔碳对罗丹明B的吸附

采用过硫酸钾(KSP)氧化法对有序介孔碳FDU-15进行了改性处理,制备了羧基化改性有序介孔碳FDU-15-KSP,对其进行了表征,并将其用于典型难降解染料罗丹明B的吸附。表征结果显示:KSP氧化处理可提高介孔碳上的羧基含量,但并未破坏其二维六方有序结构。实验结果表明:与FDU-15相比,FDU-15-KSP对罗丹明B的吸附性能显著提高,常温下的饱和吸附量由136.99 mg/g提高到196.08 mg/g;吸附p H为7时吸附效果最好,经60 min吸附后吸附过程基本达到平衡,温度升高有利于吸附的进行;FDU-15-KSP对罗丹明B的吸附过程较符合Langmuir等温吸附模型,是一个自发的、吸热的熵驱动过程;FDU-15-KSP对罗丹明B的吸附行为遵循Lagergren准二级动力学方程,吸附过程以化学吸附为主。

Adsorption of rhodamine B on carboxylated ordered mesoporous carbon

Ordered mesoporous carbon FDU-15 was modified to prepare carboxylated ordered mesoporous carbon FDU-15-KSP by oxidation process with potassium persulfate（KSP）. The product was characterized and used for adsorption of the typical refractory dye rhodamine B. The characterization results show that after KSP oxidation,the amount of carboxyl group on the mesoporous carbon is increased ,but its ordered two-dimensional hexagonal mesostructure isn’t destroyed. The experimental results show thatThe adsorption capability of FDU-15-KSP to rhodamine B is much higher than that of FDU-15,and the saturated adsorption capacity of FDU-15-KSP is increased from 136.99 mg/g to 196.08 mg/g under normal temperature condition；The adsorption effect is the best at pH 7，and the adsorption equilibrium is reached after 60 min of reaction；High temperature is good for the adsorption；The adsorption process of rhodamine B on FDU-15-KSP fits well to the Langmuir model and is spontaneous，endothermic and entropy driven；The adsorption behavior of FDU-15-KSP to rhodamine B is followed the Lagergren pseudo-second-order kinetic model，and the adsorption process is mainly based on chemical adsorption.