多级介孔炭对刚果红染料吸附性能的研究

STUDY ON ADSORPTION OF CONGO RED FROM AQUEOUS SOLUTION BY HIERARCHICAL MESOPOROUS CARBON

以商业硅胶为模板，采用硬模板法制备了多级介孔炭，并研究了其对水溶液中刚果红染料的吸附性能。研究结果表明制备的多级介孔炭具有高比表面，大孔容和集中孔径分布以及高效吸附脱除刚果红染料的性能。多级介孔炭对水溶液中刚果红的吸附等温线符合Langmuir吸附模型，且在45℃具有最大吸附量，为446．89nag·g^-1。吸附动力学研究表明动力学数据遵循拟二级动力学模型。热力学研究发现，在25—45oC内，刚果红在多级介孔炭上的吸附行为时吸热过程，且是自发进行的。

In this work, the adsorption behavior of Congo Red （CR） from aqueous solution on hierarchical mesoporous carbon which was prepared using commercial silica gel as a hard template and characterized by the N2 adsorption/ desorption method below 77 K, were investigated under various experimental conditions. The results show that the hierarchical mesoporous carbon possesses high surface area, large pore volume, narrow pore size distribution, and adsorbed efficiently CR dye from aqueous solution. The equilibrium adsorption data fitted well with the Langmuir isotherm via non-linear regression analysis, and the maximum adsorption capacity for CR is 446.89 mg· g^-1 at 45 ℃ . Kinetic studies show that the dynamical data obey well the pseudo-second-order kinetic model. For thermodynamic studies, parameters such as the Gibbs free energy, the enthalpy and the entropy, imply that the adsorption process is spontaneous and endothermic at the temperatures under investigation （25-45 ℃ ） .