Murray Audrey, Örmeci Banu
Department of Civil and Environmental Engineering, Carleton University, Ottawa, ON K1S 5B6, Canada.
Department of Civil and Environmental Engineering, Carleton University, Ottawa, ON K1S 5B6, Canada.
J Environ Sci (China). 2018 Apr;66:310-317. doi: 10.1016/j.jes.2017.04.029. Epub 2017 May 9.
Natural organic matter (NOM), present in natural waters and wastewater, decreases adsorption of micropollutants, increasing treatment costs. This research investigated mechanisms of competition for non-imprinted polymers (NIPs) and activated carbon with humic acid and wastewater. Three different types of activated carbons (Norit PAC 200, Darco KB-M, and Darco S-51) were used for comparison with the NIP. The lower surface area and micropore to mesopore ratio of the NIP led to decreased adsorption capacity in comparison to the activated carbons. In addition, experiments were conducted for single-solute adsorption of Methylene Blue (MB) dye, simultaneous adsorption with humic acid and wastewater, and pre-loading with humic acid and wastewater followed by adsorption of MB dye using NIP and Norit PAC 200. Both the NIP and PAC 200 showed significant decreases of 27% for NIP (p=0.087) and 29% for PAC 200 (p=0.096) during simultaneous exposure to humic acid and MB dye. There was no corresponding decrease for NIP or PAC 200 pre-loaded with humic acid and then exposed to MB. In fact, for PAC 200, the adsorption capacity of the activated carbon increased when it was pre-loaded with humic acid by 39% (p=0.0005). For wastewater, the NIP showed no significant increase or decrease in adsorption capacity during either simultaneous exposure or pre-loading. The adsorption capacity of PAC 200 increased by 40% (p=0.001) for simultaneous exposure to wastewater and MB. Pre-loading with wastewater had no effect on MB adsorption by PAC 200.
天然水体和废水中存在的天然有机物（NOM）会降低微污染物的吸附，从而增加处理成本。本研究调查了非印迹聚合物（NIPs）和活性炭与腐殖酸及废水的竞争机制。使用三种不同类型的活性炭（Norit PAC 200、Darco KB-M和Darco S-51）与NIP进行比较。与活性炭相比，NIP较低的表面积以及微孔与中孔的比例导致其吸附容量降低。此外，还进行了亚甲基蓝（MB）染料的单溶质吸附、与腐殖酸和废水的同时吸附，以及先用腐殖酸和废水预加载，然后使用NIP和Norit PAC 200吸附MB染料的实验。在同时暴露于腐殖酸和MB染料的过程中，NIP和PAC 200都出现了显著下降，NIP下降了27%（p = 0.087），PAC 200下降了29%（p = 0.096）。先用腐殖酸预加载然后再暴露于MB的情况下，NIP或PAC 200没有相应的下降。事实上，对于PAC 200，当用腐殖酸预加载时，活性炭的吸附容量增加了39%（p = 0.0005）。对于废水，在同时暴露或预加载过程中，NIP的吸附容量没有显著增加或减少。在同时暴露于废水和MB时，PAC 200的吸附容量增加了40%（p = 0.001）。用废水预加载对PAC 200吸附MB没有影响。
