School of Environment, Henan Normal University, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, International Joint Laboratory on Key Techniques in Water Treatment, Xinxiang, Henan 453007, PR China.
School of Environment, Henan Normal University, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, International Joint Laboratory on Key Techniques in Water Treatment, Xinxiang, Henan 453007, PR China.
Bioresour Technol. 2020 Dec;318:124046. doi: 10.1016/j.biortech.2020.124046. Epub 2020 Aug 28.
We show that persistent free radicals (PFRs) on the surface of biochar can produce hydroxyl radicals (•OH) by catalyzing HO to facilitate the removal of the combined pollutant BPA-Cr(VI). Microstructure characterization showed that the structures of pyrocarbon and hydrochar were significantly different when prepared at different temperatures. As the preparation temperature and preparation time for biochar increased, the concentration of PFRs first increased and then decreased. When biochar, PFRs, and HO were present in the same solution, the single pollutants BPA and Cr(VI) as well as the combined pollutant BPA-Cr(VI) could be removed effectively, with removal rates greater than 90%. However, when PFRs, BPA, HO, and Cr(VI) were present in the same solution, Cr(VI) competed with HO for electrons and promoted the removal of BPA. The results of this study could be applied to sludge recycling and be used to develop approaches to catalytically degrade combined pollutants.
我们证明，生物炭表面的持久性自由基（PFRs）可以通过催化 HO 产生羟基自由基（•OH），从而促进结合污染物 BPA-Cr(VI) 的去除。微观结构特征表明，在不同温度下制备时，热解碳和水炭的结构有显著差异。随着生物炭的制备温度和时间的增加，PFRs 的浓度先增加后减少。当生物炭、PFRs 和 HO 存在于同一溶液中时，可有效去除单一污染物 BPA 和 Cr(VI) 以及结合污染物 BPA-Cr(VI)，去除率大于 90%。然而，当 PFRs、BPA、HO 和 Cr(VI) 存在于同一溶液中时，Cr(VI) 与 HO 争夺电子并促进 BPA 的去除。本研究结果可应用于污泥回收，并用于开发催化降解结合污染物的方法。
