Wang Yangyang, Wang Lei, Zhang Yalei, Mao Xuhui, Tan Wenbing, Zhang Yali, Wang Xiaoshu, Chang Ming, Guo Ruonan, Xi Beidou
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China; School of Construction and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, PR China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China; School of Construction and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, PR China.
J Colloid Interface Sci. 2021 Jun 15;592:358-370. doi: 10.1016/j.jcis.2021.02.056. Epub 2021 Feb 20.
To improve advanced oxidation processes (AOPs), bio-inspired iron-encapsulated biochar (bio-inspired Fe⨀BC) catalysts with superior performance were prepared from iron-rich biomass of Iris sibirica L. using a pyrolysis method under anaerobic condition. The obtained compounds were used as catalysts to activate perdisulfate (PDS) and then degradate 2,4-dichlorophenol (2,4-DCP), and synthetic iron-laden biochar (synthetic Fe-BC) was used for comparison. The highest removal rate of 2,4-DCP was 98.35%, with 37.03% of this being distinguished as the contribution of micro-electrolysis, greater than the contribution of adsorption (32.81%) or advanced oxidation (28.51%). The high performance of micro-electrolysis could be attributable to the formation of Fe (Iron, syn) and austenite (CFe) with strong electron carrier at 700 °C. During micro-electrolysis, Fe and electrons were gradually released and then used as essential active components to enhance the AOPs. The slow-releasing Fe (K = 0.0048) also inhibited the overconsumption of PDS (K = -0.00056). Furthermore, the electrons donated from Fe⨀BC-4 were able to activate PDS directly. The electrons were enriched by the porous structure of Fe⨀BC-4, and the formation of the COFe bond in the π-electron system could also accelerate the electron transfer to activate PDS. Similar reactive oxygen species (ROS) were identified during the micro-electrolysis and AOPs, leading to similar degradation pathways. The higher does concentration of O generated during micro-electrolysis than during the AOPs also led to a greater dechlorination effect.
为了改进高级氧化工艺（AOPs），在厌氧条件下采用热解方法，以西伯利亚鸢尾富含铁的生物质为原料制备了具有优异性能的仿生铁包封生物炭（仿生Fe⨀BC）催化剂。将所得化合物用作催化剂来活化过二硫酸盐（PDS），进而降解2,4 - 二氯苯酚（2,4 - DCP），并使用合成载铁生物炭（合成Fe - BC）进行对比。2,4 - DCP的最高去除率为98.35%，其中37.03%归因于微电解的贡献，大于吸附（32.81%）或高级氧化（28.51%）的贡献。微电解的高性能可归因于在700℃下形成了具有强电子载体的Fe（铁，合成）和奥氏体（CFe）。在微电解过程中，Fe和电子逐渐释放，然后用作增强AOPs的关键活性成分。缓慢释放的Fe（K = 0.0048）也抑制了PDS的过度消耗（K = -0.00056）。此外，从Fe⨀BC - 4供出的电子能够直接活化PDS。电子通过Fe⨀BC - 4的多孔结构得以富集，并且在π电子体系中形成的COFe键也可以加速电子转移以活化PDS。在微电解和AOPs过程中鉴定出了相似的活性氧物种（ROS），导致相似的降解途径。微电解过程中产生的O的剂量浓度高于AOPs过程，这也导致了更大的脱氯效果。
