粉末活性炭吸附水中氯苯的动力学研究

A kinetic study of chlorobenzene adsorption onto powder activated carbon from liquid solution

为了解粉末活性炭(PAC)对水中氯苯的吸附性能,研究了4种PAC对水中氯苯的吸附动力学,并对4种PAC的物理特征及孔径分布进行了分析.结果表明:4种PAC均具有较广的孔径分布,其对氯苯的平衡吸附量随比表面积和孔容积的增大而增大.PAC对氯苯吸附速率很快,5 min吸附量可达到平衡时的80%以上,30 min后吸附基本达到平衡.假二级和假三级动力学模型均能较好地描述吸附过程,假二级模型更适合描述2 h以内的吸附过程,假三级模型适合描述吸附时间大于2 h的吸附过程.

To understand the property of chlorobenzene adsorption on powder activated carbon（PAC）,an analysis of physical characteristics and pore size distributions（PSD） was conducted for the four types of PAC which were used in the kinetic study of chlorobenzene adsorption from liquid solution.It was concluded that all the four types of PAC had a wild pore size distribution,and the adsorption capability increased with the increasing of BET surface area and pore volume.The rate of chlorobenzene adsorption onto PAC was so fast that the adsorption capability at 5 minutes was more than 80 percent of that of adsorption equilibrium achieved at about 30 minutes.The experimental adsorption data showed good correlation with pseudo-second-order kinetics equation and pseudo-third-order kinetics equation which had a satisfied description for the process of chlorobenzene adsorption within 2 h and more than 2 h,respectively.