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Insights into multi-pathway peroxymonosulfate activation by copper-doped Ca/Mn perovskite oxides for diethyl phthalate degradation
Journal of Environmental Chemical Engineering ( IF 7.4 ) Pub Date : 2023-04-03 , DOI: 10.1016/j.jece.2023.109845
Chenhui Liu , Meiqing Chen , Quanyun Ye , Pingxiao Wu , Jieyu Liu , Jiayan Wu , Zhongbo Shang , Wenchao Niu , Nengwu Zhu

Peroxymonosulfate (PMS) activation based on metallic catalysts with versatile mineral structures and superior catalytic properties has attracted much attention. In this study, we built a CaMnO3(CMO) with copper dopped to promote PMS activation by Mn(III)/Mn(IV) and Cu(I)/Cu(II) redox cycles with the synergistic effect of bimetal for efficient degradation of diethyl phthalate (DEP). Under optimal conditions, 95.7% of DEP (10 mg L−1) degradation was realized in 60 min, and the mineralization reached 75%, while only 26.9% of DEP was removed with little TOC removal by CaMnO3. Unexpectedly, not only •OH, O2•− and SO4•−, but also nonradical pathway singlet oxygen (1O2) was found to be involved in the CMO-Cu/PMS system. The redox cycles of Mn(III)/Mn(IV) and Cu(I)/Cu(II) effectively promoted PMS activation to reactive oxygen species (ROS), which were responsible for DEP degradation. Furthermore, density functional theory (DFT) calculations and liquid chromatograph-mass spectrometer (LCMS) were combined to explore the degradation pathway. This work provides a new insight for developing heterogeneous perovskites for PMS activation to construct more efficient method for water treatment.

中文翻译:


了解铜掺杂 Ca/Mn 钙钛矿氧化物活化对邻苯二甲酸二乙酯降解的多途径过氧一硫酸盐



基于金属催化剂的过氧一硫酸盐 (PMS) 活化具有多种矿物结构和卓越的催化性能,引起了广泛关注。在这项研究中,我们构建了一种掺杂铜的 CaMnO3 (CMO),以促进 Mn(III)/Mn(IV) 和 Cu(I)/Cu(II) 氧化还原循环的 PMS 活化,具有双金属的协同作用,可有效降解邻苯二甲酸二乙酯 (DEP)。在最佳条件下,在 60 分钟内实现了 95.7% 的 DEP (10 mg L-1) 降解,矿化度达到 75%,而仅去除了 26.9% 的 DEP,CaMnO3 去除了很少的 TOC。出乎意料的是,不仅发现 •OH、O2•− 和 SO4•−,而且非自由基途径单线态氧 (1O2) 也参与 CMO-Cu/PMS 系统。Mn(III)/Mn(IV) 和 Cu(I)/Cu(II) 的氧化还原循环有效地促进了 PMS 活化为活性氧 (ROS),这是 DEP 降解的原因。此外,将密度泛函理论 (DFT) 计算与液相色谱-质谱仪 (LCMS) 相结合,探索降解途径。这项工作为开发用于 PMS 活化的异相钙钛矿以构建更高效的水处理方法提供了新的思路。
更新日期:2023-04-03
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