化学气相沉积法改性ACFs及其去除溶液中甲基橙的应用(英文)

Modification of ACFs by chemical vapor deposition and its application for removal of methyl orange from aqueous solution

通过化学气相沉积法(CVD)对粘胶基活性炭纤维(ACFs)进行表面改性,利用比表面积、SEM、孔径分布和红外光谱等分析方法对样品进行表征。通过吸附实验研究改性ACFs对溶液中甲基橙的吸附行为。结果表明,吸附数据较符合Langmuir等温线模型;准二级动力学方程能够较好地反映改性ACFs对溶液中甲基橙的吸附动力学;颗粒间扩散为控制步骤,但并非唯一控制步骤。经计算获得的热力学参数包括ΔG、ΔH和ΔS,表明吸附为自发的放热物理吸附过程。从红外光谱分析可知,氢键作用是改性ACFs吸附甲基橙的主要吸附机理。

Viscose activated carbon fibers （ACFs） were characterized using specific surface area, scanning electron modified with chemical vapor deposition （CVD）. The samples were microscopy （SEM）, pore size distribution and Fourier transform infrared spectroscopy （FTIR）. Batch adsorption experiments were carried out to investigate the adsorption behavior of modified ACFs for methyl orange（MO） from its aqueous solutions. The results show that the adsorption isotherms of MO onto modified ACFs well follows the Langmuir isotherm equation. The adsorption kinetics of MO can be well described by the pseudo second-order kinetic model. The adsorption process involves the intra-particle diffusion, but is not the only rate-controlling step. Thermodynamic parameters including AG, AH and AS were calculated, suggesting that the adsorption of MO onto modified ACFs is a spontaneous, exothermic and physisorption process. FTIR result indicates that the major adsorption mechanism of modified ACFs for MO is hydrogen bond.