Department of Textile Engineering, University of Guilan, Rasht, Iran.
J Hazard Mater. 2011 Jul 15;191(1-3):380-7. doi: 10.1016/j.jhazmat.2011.04.096. Epub 2011 May 5.
In this work, equilibrium and kinetic adsorption of humic acid (HA) onto chitosan treated granular activated carbon (MGAC) has been investigated and compared to the granular activated carbon (GAC). The adsorption equilibrium data showed that adsorption behaviour of HA could be described reasonably well by Langmuir adsorption isotherm for GAC and Freundlich adsorption isotherm for MGAC. It was shown that pre-adsorption of chitosan onto the surface of GAC improved the adsorption capacity of HA changing the predominant adsorption mechanism. Monolayer capacities for the adsorption of HA onto GAC and MGAC were calculated 55.8 mg/g and 71.4 mg/g, respectively. Kinetic studies showed that film diffusion and intra-particle diffusion were simultaneously operating during the adsorption process for MGAC.
在这项工作中，研究了腐殖酸（HA）在壳聚糖处理的颗粒活性炭（MGAC）上的平衡和动力学吸附，并与颗粒活性炭（GAC）进行了比较。吸附平衡数据表明，GAC 的 HA 吸附行为可以用 Langmuir 吸附等温线很好地描述，而 MGAC 的则可以用 Freundlich 吸附等温线描述。结果表明，壳聚糖预先吸附在 GAC 表面上提高了 HA 的吸附能力，改变了主要的吸附机制。计算出 HA 吸附到 GAC 和 MGAC 上的单层容量分别为 55.8 mg/g 和 71.4 mg/g。动力学研究表明，在吸附过程中，MGAC 同时发生了膜扩散和内扩散。
