Initial behavior of intraparticle diffusion model used in the description of adsorption kinetics
Initial behavior of intraparticle diffusion model used in the description of adsorption kinetics
复制标题
DOI：
10.1016/j.cej.2009.04.042
复制
发表时间：
2009-11
影响因子：
15.1
通讯作者：
Feng Wu;Ru-Ling Tseng;R. Juang
中科院分区：
文献类型：
--
作者：
Feng Wu;Ru-Ling Tseng;R. Juang
Weber和Morris提出的颗粒内扩散模型（IPD）已广泛应用于吸附动力学分析。在这项工作中，根据该模型绘制了各种初始吸附因子（Ri）的特性曲线。根据Ri值从0到1将初始吸附分为四个区域；即接近完全初始吸附（区域4）、强初始吸附（区域3）、中间初始吸附（区域2）和弱初始吸附（区域1）。以油棕壳为原料，采用蒸汽活化法制备微孔体积分数分别为0.537和0.686的活性炭。基于标准差，单宁酸（TA）、亚甲基蓝（MB）、苯酚和4-氯苯酚（4-CP）在活性炭上的吸附动力学可以通过颗粒内扩散模型得到最好的描述。 TA和MB的初始吸附属于2区，苯酚和4-CP的初始吸附大部分属于3区。调查的86个吸附系统中近80%属于2区和3区，表明使用较小颗粒的活性炭和蒸汽活性炭时Ri值较小。
The intraparticle diffusion model (IPD) proposed by Weber and Morris has been widely applied for the analysis of adsorption kinetics. In this work, the characteristic curves based on this model were plotted with various initial adsorption factors (Ri). Four zones of the initial adsorption according to Rivalue from 0 to 1 were classified; that is, approaching completely initial adsorption (zone 4), strongly initial adsorption (zone 3), intermediately initial adsorption (zone 2), and weakly initial adsorption (zone 1). Activated carbons with micropore volume fraction of 0.537 and 0.686 were prepared from oil-palm shells by steam activation. Based on the standard deviations, the kinetics of the adsorption of tannic acid (TA), methylene blue (MB), phenol, and 4-chlorophenol (4-CP) on activated carbons could be best described by intraparticle diffusion model. The initial adsorption of TA and MB belonged to zone 2, and that of phenol and 4-CP mostly belonged to zone 3. Nearly 80% of the 86 adsorption systems surveyed belonged to zones 2 and 3, indicating that the Rivalue was smaller when the carbon with smaller particle and steam-activated carbon was used.