Background

Based on the advanced oxidation process of transition metal activated peroxymonosulfate (PMS), a heterogeneous catalyst with simple synthesis strategy and high efficiency was prepared. It was used to remove refractory organic pollutants.

Methods

We designed a biochar modified cobalt-iron bimetallic composite catalyst (BC@CFC) via co-precipitation and calcination methods using biomass and cobalt-iron layered double hydroxide as precursors.

Significant Findings

BC₁@CF₂C exhibited a unique multi-level porous layered structure, which reasonably reduced the agglomeration of cobalt-iron composite and increased the specific surface area. This allowed the catalyst to create more exposed active sites and favorably activate PMS, with a rapid and efficient degradation of tetracycline (TC) in 5 min (92.49%±0.21%) and 30 min (96.63%±1.68%). BC₁@CF₂C was magnetic and easy to recover, it maintained a superior TC removal rate (about 90%) after 5 cycles. This remarkable performance was benefited from the synergistic effect of cobalt-iron bimetal to enhance the activation effect of PMS, which led to the production of sulfate free radicals (SO₄^•−) and hydroxyl free radicals (•OH) to further attack TC. BC@CFC possessed the advantages of being environment-friendly, high catalytic activity and sustainability, which could be of great value in environmental application.

中文翻译：

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多层多孔层状生物炭改性钴铁复合材料作为可重复使用的过氧单硫酸盐协同活化剂增强四环素降解

背景

基于过渡金属活化过一硫酸盐（PMS）的高级氧化工艺，制备了一种合成策略简单、效率高的多相催化剂。它用于去除难降解的有机污染物。

方法

我们以生物质和钴铁层状双氢氧化物为前驱体，通过共沉淀和煅烧方法设计了一种生物炭改性钴铁双金属复合催化剂（BC@CFC）。

重要发现

BC ₁ @CF ₂ C呈现出独特的多层多孔层状结构，合理地减少了钴铁复合材料的团聚，增加了比表面积。这使得催化剂能够产生更多暴露的活性位点并有利地激活 PMS，在 5 分钟（92.49%±0.21%）和 30 分钟（96.63%±1.68%）内快速有效地降解四环素（TC）。BC ₁ @CF ₂ C 具有磁性且易于回收，5 次循环后仍保持优异的 TC 去除率（约 90%）。这种显着的性能得益于钴铁双金属的协同作用以增强 PMS 的活化作用，从而导致硫酸根自由基 (SO ₄ ^•−) 和羟基自由基 (•OH) 进一步攻击 TC。BC@CFC具有环境友好、催化活性高、可持续性等优点，在环境应用中具有重要价值。