活性炭纤维吸附水中对硝基苯酚的行为

Adsorption Behavior of p-Nitrophenol from Water onto Activated Carbon Fiber

研究了pH和盐对活性炭纤维吸附对硝基苯酚的影响,测定了其吸附等温线,分析了吸附热力学和动力学。结果表明,pH对吸附影响较大,pH为4.3时,吸附量最大。氯化钠的存在对吸附有利。Freundlich方程比Langmuir方程更好地描述活性炭纤维吸附对硝基苯酚的行为,表明此吸附可能存在多分子层吸附,此吸咐是优惠吸附,低温有利于吸附;此吸咐是放热的物理吸附,也是一自发的过程。假二级反应动力学模型很好地拟合吸附动力学实验数据。

Effects of pH and NaCl on the adsorption of p-nitrophenol （PNP） onto activated carbon fiber （ACF） were studied;adsorption isotherms were measured at different temperatures;the thermodynamics and kinetics of the adsorption were also studied. It was found that PNP adsorption amount significantly depended on pH, with the maximum adsorption amount at pH 4.3 ;and sodium chloride in the solution facilitated PNP adsorption on ACF. Freundlich equation was better than Langmuir equation in describing the behavior of PNP adsorption onto ACF, thus indicating the possibility of polymolecular layer adsorption. The adsorption was favorable one, and the adsorption capacity increased with decreasing temperature. The adsorption was an exothermic physical and spontaneous process. The experimental data were fitted very well by the pseudo-second-order kinetic model.