介孔SBA-15分子筛对苯酚的吸附性能  

Adsorption of Phenol onto Mesoporous SBA-15 Molecular Sieves

作　　者：王贵珍[1] 陈玉红[1] 李永真[1] 邸青[1] 薛全民[2] 

机构地区：[1]河北化工医药职业技术学院,河北石家庄050026 [2]北京科技大学机械工程学院,北京100083

出　　处：《石油化工》2012年第6期704-708,共5页Petrochemical Technology

基　　金：河北省高等学校自然科学青年基金项目(2011148)

摘　　要：针对废水中苯酚的脱除,研究了硅基介孔分子筛SBA-15对苯酚的吸附,并与活性炭进行了对比;采用XRD和N2吸附-脱附法对SBA-15分子筛和活性炭进行了表征。与活性炭相比,SBA-15分子筛的比表面积虽小,但其具有丰富的介孔,使其达到吸附平衡所用的时间较短且饱和吸附量较大。SBA-15分子筛对苯酚的吸附可用Langmuir和Freundlich等温吸附方程描述,其中Langmuir等温吸附方程具有更好的相关性。分别采用拟一级和拟二级反应模型考察了SBA-15分子筛对苯酚的吸附动力学,拟二级反应模型与实验数据之间有很好的相关性。热力学参数的计算结果表明,SBA-15分子筛对苯酚的吸附过程是放热和自发的过程,且以物理吸附为主。In order to remove phenol from waste water, the adsorption of phenol on mesoporous SBA-15 was studied by thermodynamic and kinetic methods, and was compared to self-made activated carbon（AC）. The SBA-15 and AC were characterized by means of XRD and N2 adsorption-desorption. Compared to AC, the specific surface area of SBA-15 is small, but it has a lot of mesopores which leads to shorter adsorption equilibrium time and larger saturated adsorption capacity. Freundlich and Langmuir isothermal adsorption equations were used to describe the adsorption, and it was showed that the Langmuir model fitted the experimental data better. The adsorption kinetics was investigated with pseudo-first-order and pseudo-second-order models, and the adsorption rate constants were calculated. It was found that the pseudo-second-order kinetic model could provide better correlation with the experimental data. The calculated results for the thermodynamic parameters showed that the adsorption process was exothermic, spontaneous and physical adsorption.

关 键 词：SBA-15分子筛 苯酚 介孔分子筛 吸附动力学 吸附热力学 

分 类 号：TQ424.25[化学工程]