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Activation of peroxymonosulfate for degrading ibuprofen via single atom Cu anchored by carbon skeleton and chlorine atom: The radical and non-radical pathways
Science of the Total Environment ( IF 8.2 ) Pub Date : 2022-11-08 , DOI: 10.1016/j.scitotenv.2022.160097
Weirui Chen 1 , Xukai Li 2 , Xipeng Wei 3 , Gaozu Liao 2 , Jing Wang 2 , Laisheng Li 2
Affiliation  

Single atomic Cu catalysts (SACs Cu@C) anchored by carbon skeleton and chlorine atom was synthesized by hydrolyzing Cu-MOFs and then pickled by aqua-regia to remove Cu nanoparticles (NPs Cu). Comparative characterizations revealed that SACs Cu@C was a hierarchically porous nanostructure and Cu dispersed uniformly throughout the carbon skeletons. With less active components, SACs Cu@C behaved better in activating PMS over NPs Cu@C on ibuprofen removal (91.3 % versus 30.2 % in 30 min). Two Cu coordination environments were found by EXAF and DFT calculation, including four-coordinated Cu with 4C atoms and six-coordinated Cu with 4Cu and 2Cl atoms. The obvious interfacial electron delivery between PMS and SACs Cu@C was found, which was enhanced by Cl atom. Cu(I)/Cu(II) redox cycle would donate electron to peroxy bond of PMS for generating OH, SO4 and O2. But electron transferred in opposite direction when PMS bonded to Cu atom through its terminal oxygen atom in sulfate, which formed 1O2. IBP degradation proceeded through both radical and non-radical route. IBP degradation was inhibited with the presence of TBA, methanol and furfuryl alcohol but accelerated by p-BQ, which could accelerate OH generation. Two degradation pathways were deducted. This study provided a new insight into catalysts designed for PMS activation.

中文翻译:


通过碳骨架和氯原子锚定的单原子 Cu 活化过氧一硫酸盐降解布洛芬:自由基和非自由基途径



通过水解 Cu-MOF 合成由碳骨架和氯原子锚定的单原子 Cu 催化剂 (SACs Cu@C),然后用王水酸洗去除 Cu 纳米颗粒 (NPs Cu)。比较表征表明,SACs Cu@C是一种分层多孔纳米结构,Cu 均匀分散在整个碳骨架中。在活性成分较少的情况下,SAC 在激活 PMS 方面的表现Cu@C优于 NPs,Cu@C去除布洛芬时 (30 分钟内为 91.3% 对 30.2 %)。通过 EXAF 和 DFT 计算得到两个 Cu 配位环境,包括 4C 原子的 4 位 Cu 和 4Cu 和 2Cl 原子的 6 位 Cu。发现 PMS 和 SACs 之间明显的界面电子传递Cu@C,这被 Cl 原子增强。Cu(I)/Cu(II) 氧化还原循环会将电子提供给 PMS 的过氧键以生成 OH、SO4− 和 O2−。但是当 PMS 通过其硫酸盐中的末端氧原子与 Cu 原子键合时,电子会向相反方向转移,形成 1O2。IBP 降解通过自由基和非自由基途径进行。TBA、甲醇和糠醇的存在抑制了 IBP 降解,但 p-BQ 加速了 IBP 降解,从而加速了 OH 的产生。扣除 2 条降解途径。这项研究为设计用于 PMS 活化的催化剂提供了新的见解。
更新日期:2022-11-08
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