Fe_3O_4@SiO_2@CPB磁性纳米粒子对刚果红的吸附研究

Adsorption of Congo Red by Fe_3O_4@SiO_2@CPB Magnetic Nanoparticles

使用简单的合成方法,制备出Fe_3O_4@SiO_2@CPB磁性纳米粒子,通过透射电子显微镜进行结构表征.研究了刚果红初始浓度、反应温度和pH值对吸附效果的影响.研究结果表明,吸附剂对刚果红具有较好的吸附能力,吸附量随刚果红浓度增大和温度升高而增大,而pH对吸附量的影响不大.吸附动力学表明Fe_3O_4@SiO_2@CPB对刚果红的吸附过程更符合准二级反应模型.等温吸附线性拟合表明该吸附过程更符合Langmuir等温吸附,最大吸附容量为434.783 mg/g左右.

Fe3O4@ SiO2@ CPB magnetic nanoparticles were prepared by a simple synthesis method and characterized by transmission electron microscopy（ TEM）.The effects of the initial concentration of congo red,the reaction temperature and the pH valueon the adsorption effect were studied. The results showed that the adsorbent has better adsorption capacity for congo red.The amount of adsorption increases with the increase of congo red concentration and temperature,while the pH had little effect on the adsorption amount. The adsorption kinetics showed that the Fe3O4@ SiO2@ CPB adsorption process for congo red was more consistent with the pseudo second-order reaction model.The isothermal adsorption linear fitting showed that the adsorption process was more in line with Langmuir adsorption,and the maximum adsorption capacity was about 434.783 mg/g.