Li Kunquan, Zheng Zheng, Feng Jingwei, Zhang Jibiao, Luo Xingzhang, Zhao Guohua, Huang Xingfa
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China.
J Hazard Mater. 2009 Jul 30;166(2-3):1180-5. doi: 10.1016/j.jhazmat.2008.12.035. Epub 2008 Dec 9.
Activated carbon fiber prepared from cotton stalk was used as an adsorbent for the removal of p-nitroaniline (PNA) from aqueous solutions. Liquid phase adsorption experiments were conducted and the maximum adsorptive capacity was determined. The effect of experimental parameters such as pH, salinity and temperature on the adsorption was studied. The obtained experimental data were then fitted with the Langmuir, Freundlich and Redlich-Peterson models to describe the equilibrium isotherms. The kinetics rates were modeled by using the pseudo-first-order and pseudo-second-order equations. The results indicated that cotton stalk activated carbon fiber (CS-ACF) is an effective adsorbent for the removal of PNA from aqueous solutions. The maximum adsorption capacity of 406 mg g(-1) was achieved at the initial PNA concentration of 200 mg L(-1). The optimum pH for the removal of PNA was found to be 7.6. The presence of ammonium chloride proved to be favorable for the process of adsorption. The adsorption amount decreased with increasing temperature. The Redlich-Peterson model was found to best represent the equilibrium data. The kinetic data followed closely the pseudo-second-order equation. Thermodynamic study showed the adsorption was a spontaneous exothermic physical process.
以棉秆制备的活性炭纤维作为吸附剂，用于去除水溶液中的对硝基苯胺（PNA）。进行了液相吸附实验并测定了最大吸附容量。研究了pH值、盐度和温度等实验参数对吸附的影响。然后将获得的实验数据与朗缪尔、弗伦德里希和雷德利希 - 彼得森模型进行拟合，以描述平衡等温线。动力学速率通过拟一级和拟二级方程进行建模。结果表明，棉秆活性炭纤维（CS - ACF）是从水溶液中去除PNA的有效吸附剂。在初始PNA浓度为200 mg L(-1)时，实现了406 mg g(-1)的最大吸附容量。发现去除PNA的最佳pH值为7.6。氯化铵的存在被证明有利于吸附过程。吸附量随温度升高而降低。发现雷德利希 - 彼得森模型最能代表平衡数据。动力学数据紧密遵循拟二级方程。热力学研究表明吸附是一个自发的放热物理过程。
