Densely Stacked CoCu-MOFs Coated with CuAl/LDH Enhance Sulfamethoxazole Degradation in PMS-Activated Systems
As the most promising techniques for refractory antibiotic degradation in wastewater management, sulfate radical-based advanced oxidation processes (SR-AOPs) have attracted considerable attention. However, systematic studies on potassium peroxymonosulfate (PMS) activation by MOF-derived metal oxides...
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2025-03-01
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| author | Xin Zhong Xiaojun Liu Meihuan Ji Fubin Jiang |
| author_facet | Xin Zhong Xiaojun Liu Meihuan Ji Fubin Jiang |
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| description | As the most promising techniques for refractory antibiotic degradation in wastewater management, sulfate radical-based advanced oxidation processes (SR-AOPs) have attracted considerable attention. However, systematic studies on potassium peroxymonosulfate (PMS) activation by MOF-derived metal oxides coated with LDH materials are still lacking. In this work, a series of catalysts consisting of CoCu-MOFs coated with CuAl/LDH were synthesized for PMS activation in the removal of sulfamethoxazole (SMX). As expected, CoCu-MOFs coated with CuAl/LDH catalyst showed high SMX removal and stability in PMS activation. In the CoCu/LDH/PMS reaction, the SMX removal was nearly 100% after 60 min, and the mineralization reached 53.7%. The catalyst showed excellent catalytic stability and low metal leaching concentrations (Co: 0.013 mg/L, Cu: 0.313 mg/L), as detected by ICP. Sulfate radicals and hydroxyl radicals were identified as the dominant reactive species in the CoCu/LDH/PMS system. Moreover, the presence of <sup>1</sup>O<sub>2</sub> in the process revealed the coupling of non-radical and radical processes. The XPS results showed that the layered structure of CoCu/LDH promoted the recycling of metal ions (high and low valence), which facilitated heterogeneous PMS activation. The effects of different reaction conditions and reuse cycles were also determined. The SMX oxidation pathways were proposed based on the intermediates identified by LC/MS. The high activity and stability of CoCu/LDH provide a new mechanistic understanding of PMS activation catalysts and their potential utilization in practical wastewater treatment. |
| format | Article |
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| institution | DOAJ |
| issn | 2079-4991 |
| language | English |
| publishDate | 2025-03-01 |
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| spelling | doaj-art-2704b72c495d4930b1d6aa10f2e312252025-08-20T02:42:22ZengMDPI AGNanomaterials2079-49912025-03-0115643210.3390/nano15060432Densely Stacked CoCu-MOFs Coated with CuAl/LDH Enhance Sulfamethoxazole Degradation in PMS-Activated SystemsXin Zhong0Xiaojun Liu1Meihuan Ji2Fubin Jiang3Experimental Education Platform, Beijing Normal University at Zhuhai, Zhuhai 519087, ChinaFaculty of Arts and Sciences, Beijing Normal University at Zhuhai, Zhuhai 519087, ChinaExperimental Education Platform, Beijing Normal University at Zhuhai, Zhuhai 519087, ChinaFaculty of Arts and Sciences, Beijing Normal University at Zhuhai, Zhuhai 519087, ChinaAs the most promising techniques for refractory antibiotic degradation in wastewater management, sulfate radical-based advanced oxidation processes (SR-AOPs) have attracted considerable attention. However, systematic studies on potassium peroxymonosulfate (PMS) activation by MOF-derived metal oxides coated with LDH materials are still lacking. In this work, a series of catalysts consisting of CoCu-MOFs coated with CuAl/LDH were synthesized for PMS activation in the removal of sulfamethoxazole (SMX). As expected, CoCu-MOFs coated with CuAl/LDH catalyst showed high SMX removal and stability in PMS activation. In the CoCu/LDH/PMS reaction, the SMX removal was nearly 100% after 60 min, and the mineralization reached 53.7%. The catalyst showed excellent catalytic stability and low metal leaching concentrations (Co: 0.013 mg/L, Cu: 0.313 mg/L), as detected by ICP. Sulfate radicals and hydroxyl radicals were identified as the dominant reactive species in the CoCu/LDH/PMS system. Moreover, the presence of <sup>1</sup>O<sub>2</sub> in the process revealed the coupling of non-radical and radical processes. The XPS results showed that the layered structure of CoCu/LDH promoted the recycling of metal ions (high and low valence), which facilitated heterogeneous PMS activation. The effects of different reaction conditions and reuse cycles were also determined. The SMX oxidation pathways were proposed based on the intermediates identified by LC/MS. The high activity and stability of CoCu/LDH provide a new mechanistic understanding of PMS activation catalysts and their potential utilization in practical wastewater treatment.https://www.mdpi.com/2079-4991/15/6/432PMS activationantibioticsCuAl/LDHCoCu-MOFs |
| spellingShingle | Xin Zhong Xiaojun Liu Meihuan Ji Fubin Jiang Densely Stacked CoCu-MOFs Coated with CuAl/LDH Enhance Sulfamethoxazole Degradation in PMS-Activated Systems Nanomaterials PMS activation antibiotics CuAl/LDH CoCu-MOFs |
| title | Densely Stacked CoCu-MOFs Coated with CuAl/LDH Enhance Sulfamethoxazole Degradation in PMS-Activated Systems |
| title_full | Densely Stacked CoCu-MOFs Coated with CuAl/LDH Enhance Sulfamethoxazole Degradation in PMS-Activated Systems |
| title_fullStr | Densely Stacked CoCu-MOFs Coated with CuAl/LDH Enhance Sulfamethoxazole Degradation in PMS-Activated Systems |
| title_full_unstemmed | Densely Stacked CoCu-MOFs Coated with CuAl/LDH Enhance Sulfamethoxazole Degradation in PMS-Activated Systems |
| title_short | Densely Stacked CoCu-MOFs Coated with CuAl/LDH Enhance Sulfamethoxazole Degradation in PMS-Activated Systems |
| title_sort | densely stacked cocu mofs coated with cual ldh enhance sulfamethoxazole degradation in pms activated systems |
| topic | PMS activation antibiotics CuAl/LDH CoCu-MOFs |
| url | https://www.mdpi.com/2079-4991/15/6/432 |
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