Gil A, Taoufik N, García A M, Korili S A
Department of Applied Chemistry, Public University of Navarra , Pamplona , Spain.
Institute for Advanced Materials-INAMAT, Public University of Navarra , Pamplona , Spain.
Environ Technol. 2019 Sep;40(23):3017-3030. doi: 10.1080/09593330.2018.1464066. Epub 2018 Apr 19.
Batch sorption experiments were performed to study the adsorption of six emerging pollutants from aqueous solutions using a commercial granular activated carbon as adsorbent. Caffeine, clofibric acid, diclofenac, gallic acid, ibuprofen and salicylic acid were selected as representative contaminants. The activated carbon was characterized by nitrogen adsorption at 77 K, and through the determination of point of zero charge. The effects of several operational parameters, such as pH, initial concentration of organic molecules, mass of adsorbent and contact time, on the sorption behaviour were evaluated. The contact time to attain equilibrium for maximum adsorption was found to be 40 min. The kinetic data were correlated to several adsorption models, and the adsorption mechanism found to follow pseudo-second-order and intraparticle-diffusion models with external mass transfer predominating in the first 15 min of the experiment. The equilibrium adsorption data were analysed using the Freundlich, Langmuir and Toth isotherm equation models. The similar chemical structure and molecular weight of the organic pollutants studied to make the adsorption capacity of the activated carbon used very similar for all the molecules.
进行了批量吸附实验，以研究使用商业颗粒活性炭作为吸附剂从水溶液中吸附六种新兴污染物的情况。选择咖啡因、氯贝酸、双氯芬酸、没食子酸、布洛芬和水杨酸作为代表性污染物。通过在77 K下的氮气吸附以及通过零电荷点的测定对活性炭进行了表征。评估了几个操作参数，如pH值、有机分子的初始浓度、吸附剂质量和接触时间对吸附行为的影响。发现达到最大吸附平衡的接触时间为40分钟。将动力学数据与几种吸附模型相关联，发现吸附机制遵循伪二级和颗粒内扩散模型，在实验的前15分钟外部传质起主要作用。使用Freundlich、Langmuir和Toth等温方程模型分析了平衡吸附数据。所研究的有机污染物具有相似的化学结构和分子量，使得所用活性炭对所有分子的吸附容量非常相似。
