State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou, 510655, China.
Research Centre for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan, 523808, China.
J Environ Manage. 2022 Oct 1;319:115661. doi: 10.1016/j.jenvman.2022.115661. Epub 2022 Jul 6.
In this study, pristine biochar (BC), ball milling biochar (MBC), FeO modified BC (FeO@BC), and FeO modified MBC (FeO@MBC) were prepared to compare the Bisphenol A (BPA) removal efficiency by activating persulfate (PDS). All catalysts exhibited excellent degradation rather than adsorption in the PDS system, and FeO@MBC800 had the best BPA removal efficiency, with 96.73% degradation and negligible 1.43% adsorption due to the synergistic effect between MBC800 and FeO particles. Radical quenching experiments and electron paramagnetic resonance analysis indicated radical pathways, namely, SO∙ and ∙OH, O∙, and non-radical pathway (O) involving BPA degradation. The abundant oxygen-containing groups, increased graphitization and mesopores of MBC800, and Fe/Fe conversion of FeO particles facilitated PDS activation to produce reactive oxygen species. In addition, the superior electrochemical performance accelerated the electron transfer between the catalyst and PDS, promoting BPA degradation in the FeO@MBC800/PDS system. More importantly, FeO@MBC800 is resistant to environmental interference, including pH, anions, cations, and humic acid, and has good catalytic reusability and stability, which fulfills the requirements of engineering applications. Therefore, FeO loaded on ball-milled biochar provides a convenient strategy for preparing environmentally friendly, economical, and efficient carbon-based catalysts to remove organic contaminants.
在这项研究中，制备了原始生物炭（BC）、球磨生物炭（MBC）、FeO 改性生物炭（FeO@BC）和 FeO 改性 MBC（FeO@MBC），以比较它们通过激活过硫酸盐（PDS）去除双酚 A（BPA）的效率。所有催化剂在 PDS 体系中均表现出优异的降解性能，而不是吸附性能，FeO@MBC800 由于 MBC800 和 FeO 颗粒之间的协同作用，具有最佳的 BPA 去除效率，降解率为 96.73%，吸附率仅为 1.43%。自由基猝灭实验和电子顺磁共振分析表明，存在自由基途径（SO∙和 ∙OH、O∙和非自由基途径（O））涉及 BPA 降解。MBC800 丰富的含氧基团、增加的石墨化程度和中孔以及 FeO 颗粒的 Fe/Fe 转化促进了 PDS 的活化，从而产生了活性氧物质。此外，优异的电化学性能加速了催化剂和 PDS 之间的电子转移，促进了 FeO@MBC800/PDS 体系中 BPA 的降解。更重要的是，FeO@MBC800 能抵抗环境干扰，包括 pH 值、阴离子、阳离子和腐殖酸，且具有良好的催化可重复使用性和稳定性，满足工程应用的要求。因此，负载在球磨生物炭上的 FeO 为制备环保、经济、高效的碳基催化剂去除有机污染物提供了一种简便的策略。
