<br>Fe3O4 纳米颗粒通过氮掺杂碳层封装在氮化硼载体中，作为污染物降解的过一硫酸盐活化剂：金属增强的 C-N 位点的重要作用,Journal of Environmental Management

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Fe3O4 纳米颗粒通过氮掺杂碳层封装在氮化硼载体中，作为污染物降解的过一硫酸盐活化剂：金属增强的 C-N 位点的重要作用
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2022-03-08 , DOI: 10.1016/j.jenvman.2022.114859
Jianzheng Zhen ₁ , Shisong Nie ₁ , Jiahao Sun ₁ , Shiyuan Pan ₁ , Jinhui Wang ₁ , Jian Sun ₁ , Weiyang Lv ₁ , Yuyuan Yao ₁

Affiliation

开发基于过一硫酸盐（PMS）的高级氧化过程（AOP）的高效且稳定的催化剂对于环境修复领域至关重要。在这项工作中，报道了一种简便的封装前体热解策略来制备一种有效的 PMS 活化催化剂，其中均匀分布的 Fe3O 纳米颗粒通过氮掺杂碳壳（NC 层）牢固地锚定在多孔氮化硼（BN）纳米片上。利用强金属-载体相互作用，合成的催化剂（BFA-500）可以有效激活PMS，在6分钟内实现100%去除4-氯酚（4-CP），以及相应的周转频率（TOF）值比基准均相（Fe）和纳米颗粒（Fe 和 FeO）催化剂高 1-2 个数量级。此外，BFA-500受到良好保护的封装结构确保了卓越的稳定性，可有效抵抗复杂水环境的干扰，包括初始pH值、各种无机离子和实际水，并且其催化活性在5次使用再生中几乎保持不变循环。更重要的是，BFA-500/PMS 系统中用于去除 4-CP 的 O 和 O 自由基的产生归因于含有吡啶 N 的 FeO 增强的 C-N 位点，其中电子从嵌入的 FeO 纳米颗粒转移到 C-N 位点，确保 PMS 解离成活性自由基。总体而言，这项工作为设计用于废水净化的所需 PMS 活化催化剂提供了一种有前景的方法。

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Fe3O4 nanoparticles encapsulated in boron nitride support via N-doped carbon layer as a peroxymonosulfate activator for pollutant degradation: Important role of metal boosted C–N sites

Developing highly efficient and stable catalysts for peroxymonosulfate (PMS) based advanced oxidation processes (AOPs) are crucial in the field of environmental remediation. In this work, a facile encapsulated-precursor pyrolysis strategy was reported to prepare a competent PMS-activation catalyst, in which uniformly distributed FeO nanoparticles were firmly anchored on porous boron nitride (BN) nanosheets by N-doped carbon shell (NC layer). Taking advantage of strong metal-support interaction, the as-synthesized catalyst (BFA-500) could efficiently activate PMS to achieve 100% removal of 4-chlorophenol (4-CP) in 6 min, and the corresponding turnover frequency (TOF) value was 1–2 orders of magnitude higher than that of the benchmark homogeneous (Fe) and nanoparticle (Fe and FeO) catalysts. Moreover, the well protected encapsulated structure of BFA-500 ensured the remarkable stability that could effectively resist the interference of complex water environment, including initial pH value, various inorganic ions and actual water, and its catalytic activity remained almost unchanged in 5 use-regeneration cycles. More importantly, the generation of O and O radicals for the 4-CP removal in BFA-500/PMS system was ascribed to FeO boosted C–N sites containing pyridinic N, where electrons transferred from the embedded FeO nanoparticles to C–N sites to secure the PMS dissociation into reactive radicals. Overall, this work provided a promising way to design desired PMS-activation catalyst toward wastewater purification.

更新日期：2022-03-08

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