Department of Environmental Engineering, National Cheng Kung University, Tainan, 70101, Taiwan.
Global Water Quality Research Center, National Cheng Kung University, Tainan, 70955, Taiwan; Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu, 30011, Taiwan.
Water Res. 2017 Mar 15;111:28-40. doi: 10.1016/j.watres.2016.12.033. Epub 2016 Dec 21.
A new model is developed to predict the competitive adsorption isotherms of atrazine, methyl tertiary butyl ether (MTBE), 2-methylisoborneol (2-MIB) and 2,4,6-trichlorophenol onto activated carbons (ACs) in natural water. Based on the Polanyi-Dubinin (PD) equation, with the limiting pore volume of adsorbent estimated from the pore size distribution data, and the Ideal adsorbed solution theory - equivalent background compound (IAST-EBC) model approximation, the model takes into account both the properties of ACs and the impact of natural organic matters in water. Only one set of isotherm in deionized water and one set in natural water are needed to obtain the parameters for the prediction of adsorption isotherms onto different ACs in natural water. The model was employed for the predictions of adsorption capacities for atrazine, MTBE, 2-MIB and 2,4,6-trichlorophenol onto 14 ACs in 22 synthetic and natural waters reported in 9 references, with errors between 14.9% and 44.5% SDEV only. The results suggest that in the proposed PD-IAST-EBC approach, prediction of adsorption capacity for organic compounds onto different ACs in the same natural water is feasible, if the ACs are thermally activated with known pore size information. The model may provide a simple approach for the prediction of adsorption of organic compounds in natural water, and thus greatly reduces the effort required for water utilities when change of AC is needed.
建立了一个新模型，用于预测莠去津、甲基叔丁基醚（MTBE）、2-甲基异莰醇（2-MIB）和 2,4,6-三氯苯酚在天然水中被活性炭（AC）竞争吸附的等温线。基于 Polanyi-Dubinin（PD）方程，利用从孔径分布数据估算的吸附剂的极限孔体积，以及理想吸附溶液理论-等效背景化合物（IAST-EBC）模型近似值，该模型考虑了 AC 的性质和水中天然有机物的影响。只需在去离子水中进行一组等温线和在天然水中进行一组等温线，即可获得用于预测不同天然水中 AC 吸附等温线的参数。该模型用于预测 9 篇参考文献中 22 种合成和天然水中 14 种 AC 上莠去津、MTBE、2-MIB 和 2,4,6-三氯苯酚的吸附容量，误差仅为 14.9%至 44.5% SDEV。结果表明，在提出的 PD-IAST-EBC 方法中，如果 AC 具有已知的孔径信息并经过热激活，则可以在同一天然水中预测不同 AC 上有机化合物的吸附容量。该模型可以为预测天然水中有机化合物的吸附提供一种简单的方法，从而大大减少了水公司在需要更换 AC 时所需的工作量。
