A porous graphitic biochar wrapped Co9S8 core–shell composite enables pH-universal activation of peroxymonosulfate for highly efficient and rapid antibiotics degradation,Environmental Science: Nano

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A porous graphitic biochar wrapped Co9S8 core–shell composite enables pH-universal activation of peroxymonosulfate for highly efficient and rapid antibiotics degradation
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2022-08-16 , DOI: 10.1039/d2en00418f
Jiamei Li ₁ , Jia Wei ₁ , Mengdie Xu ₁ , Guoping Pan ₁ , Yifei Zhang ₁ , Luyi Xing ₁ , Yanan Li ₁ , Jun Li ₁ , Zijian Jiang ₁

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Metal sulfides have been found to be effective in removing organic pollutants from water in environmental catalysis. In this study, a porous graphitic biochar wrapped Co₉S₈ core–shell composite (Co₉S₈@N–O–BC) was designed for efficient activation of peroxymonosulfate (PMS) and degradation of sulfamethoxazole in an aqueous environment. Based on complementary characterizations and reactive oxygen species (ROS) quenching experiments, we proposed that boosted Co(II) regeneration by various existing S species along with formed N and O active sites in Co₉S₈@N–O–BC facilitated the cleavage of the O–O bond of PMS, thus resulting in a high-efficiency non-radical pathway. Consequently, Co₉S₈@N–O–BC/PMS achieved an outstanding degradation of sulfamethoxazole (100%) within 4 min in a wide pH range (3–11) and its turnover frequency (TOF) value was 11.96 min⁻¹, up to 117 times higher than other reported catalysts as far as we know. The superior stability and wide applicability in sulfamethoxazole degradation with a series of inorganic ions, especially the production of very few harmless intermediates and the exceptional mineralization efficiency, also further demonstrated that the obtained catalyst possessed excellent potential for practical wastewater treatment.

中文翻译：

多孔石墨生物炭包裹的 Co9S8 核壳复合材料能够在 pH 范围内普遍激活过氧单硫酸盐，以实现高效、快速的抗生素降解

已发现金属硫化物在环境催化中可有效去除水中的有机污染物。在这项研究中，设计了一种多孔石墨生物炭包裹的 Co ₉ S ₈核壳复合材料（Co ₉ S ₈ @N-O-BC），用于在水环境中有效激活过氧单硫酸盐（PMS）和降解磺胺甲恶唑。基于互补表征和活性氧 (ROS) 淬火实验，我们提出通过各种现有的 S 物质以及在 Co ₉ S ₈中形成的 N 和 O 活性位点促进 Co( II ) 再生@N-O-BC 促进了 PMS 的 O-O 键的断裂，从而产生了一种高效的非自由基途径。因此，Co ₉ S ₈ @N–O–BC/PMS 在较宽的 pH 范围 (3-11) 内实现了对磺胺甲恶唑 (100%) 的出色降解，其转换频率 (TOF) 值为 11.96 min ^-1，据我们所知，比其他报道的催化剂高出 117 倍。在一系列无机离子降解磺胺甲恶唑中具有优异的稳定性和广泛的适用性，特别是产生极少的无害中间体和优异的矿化效率，也进一步证明了所获得的催化剂具有良好的实际废水处理潜力。

更新日期：2022-08-16

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