Peng Xiaoming, Huang Dengpo, Odoom-Wubah Tareque, Fu Dafang, Huang Jiale, Qin Qingdong
School of Civil Engineering, Southeast University, Nanjing 210096, PR China.
Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China.
J Colloid Interface Sci. 2014 Sep 15;430:272-82. doi: 10.1016/j.jcis.2014.05.035. Epub 2014 Jun 10.
Ordered mesoporous carbon (Fe-CMK-3) with iron magnetic nanoparticles was prepared by a casting process via SBA-15 silica as template and anthracene as carbon source, was used as a magnetic adsorbent for the removal of anionic dye Orange II (O II) and cationic dye methylene blue (MB) from aqueous solution. TEM and magnetometer images showed that the iron magnetic nanoparticles were successfully embedded in the interior of the mesoporous carbon. The effect of various process parameters such as temperature (25-45°C), initial concentration (100-500 mg L(-1)) and pH (2-12) were performed. Equilibrium adsorption isotherms and kinetics were also studied. The equilibrium experimental data were analyzed by the Langmuir, Freundlich, Temkin and Redlich-Peterson model. The equilibrium data for two dyes adsorption was fitted to the Langmuir, and the maximum monolayer adsorption capacity for O II and MB dyes were 269 and 316 mg g(-1), respectively. Pseudo-first-order and pseudo-second-order kinetic and intraparticle diffusion model were used to evaluate the adsorption kinetic data. The kinetic data of two dyes could be better described by the pseudo second-order model. Thermodynamic data of the adsorption process were also obtained. It was found that the adsorption process of the two dyes were spontaneous and exothermic.
通过以SBA - 15二氧化硅为模板、蒽为碳源的浇铸工艺制备了负载铁磁性纳米颗粒的有序介孔碳（Fe - CMK - 3），并将其用作磁性吸附剂，用于从水溶液中去除阴离子染料橙黄II（O II）和阳离子染料亚甲基蓝（MB）。透射电子显微镜（TEM）和磁力计图像表明，铁磁性纳米颗粒成功嵌入介孔碳内部。考察了温度（25 - 45°C）、初始浓度（100 - 500 mg L⁻¹）和pH值（2 - 12）等各种工艺参数的影响。还研究了平衡吸附等温线和动力学。采用Langmuir、Freundlich、Temkin和Redlich - Peterson模型对平衡实验数据进行分析。两种染料吸附的平衡数据符合Langmuir模型，O II和MB染料的最大单层吸附容量分别为269和316 mg g⁻¹。采用伪一级和伪二级动力学以及颗粒内扩散模型对吸附动力学数据进行评估。两种染料的动力学数据用伪二级模型能更好地描述。还获得了吸附过程的热力学数据。发现两种染料的吸附过程都是自发的且放热的。
