TiO2 material loaded on LDH/MIL-101(Fe) is doped with La and Fe to effectively remove pyridine: “Performance and mechanism”
In this study, pyridine-a representative nitrogen-containing heterrocylic contaminant in coal chemical wastewater-was targeted for photocatalytic degradation. We developed a novel ternary composite photocatalyst through the in-situ integration of layered double hydroxide (LDH) and iron-based metal-o...
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Elsevier
2025-07-01
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| author | Wei Zhang Ku Yu Wang Aihe |
| author_facet | Wei Zhang Ku Yu Wang Aihe |
| author_sort | Wei Zhang |
| collection | DOAJ |
| description | In this study, pyridine-a representative nitrogen-containing heterrocylic contaminant in coal chemical wastewater-was targeted for photocatalytic degradation. We developed a novel ternary composite photocatalyst through the in-situ integration of layered double hydroxide (LDH) and iron-based metal-organic framework (MIL-101(Fe)) with lanthanum‑iron co-doped TiO2 via hydrothermal synthesis. These contaminants are characterized by high environmental persistence, low biodegradability, and potential teratogenic/carcinogenic risks. The synthesized LDH/MIL-101(Fe)/La-Fe-TiO2 composite was systematically characterized using scanning electron microscopy (SEM), UV–Vis diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET) analysis. Key findings revealed that: (1) The composite architecture achieves an exceptional specific surface area of 168.96 m2/g through synergistic LDH/MIL-101(Fe) integration; (2) La–Fe co-doping effectively extends the photoresponse threshold of TiO2 to the visible-light region. Under optimized conditions (25 °C, 300 rpm agitation, 400 W irradiation), the system achieved 96.1 % pyridine degradation (initial concentration: 100 mg/L) within 4 h, following pseudo-first-order kinetics (R2 = 0.99). Remarkably, the catalyst maintained 94.5 % efficiency after five consecutive cycles, demonstrating superior stability. Mechanistic investigations combining GC–MS analysis, electron paramagnetic resonance (EPR) detection, and radical quenching tests identified the reactive species activity sequence as ∙h+ >∙OH> O2−, ultimately elucidating the complete pyridine mineralization pathway. |
| format | Article |
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| institution | Matheson Library |
| issn | 2211-7156 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
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| series | Results in Chemistry |
| spelling | doaj-art-f8e7e15ceb234e54837f33ed8f9905fd2025-06-26T09:52:53ZengElsevierResults in Chemistry2211-71562025-07-0116102425TiO2 material loaded on LDH/MIL-101(Fe) is doped with La and Fe to effectively remove pyridine: “Performance and mechanism”Wei Zhang0Ku Yu1Wang Aihe2School of Civil Engineering, University of South China, Hengyang, Hunan, China; School of Municipal and Mapping Engineer, Hunan City University, Yiyang, Hunan, China; Hunan Provincial Village Drinking Water Quality Safety Engineering Technology Research Center, Yiyang, Hunan, ChinaSchool of Municipal and Mapping Engineer, Hunan City University, Yiyang, Hunan, China; Corresponding author.School of Civil Engineering, University of South China, Hengyang, Hunan, China; Hunan Provincial Village Drinking Water Quality Safety Engineering Technology Research Center, Yiyang, Hunan, ChinaIn this study, pyridine-a representative nitrogen-containing heterrocylic contaminant in coal chemical wastewater-was targeted for photocatalytic degradation. We developed a novel ternary composite photocatalyst through the in-situ integration of layered double hydroxide (LDH) and iron-based metal-organic framework (MIL-101(Fe)) with lanthanum‑iron co-doped TiO2 via hydrothermal synthesis. These contaminants are characterized by high environmental persistence, low biodegradability, and potential teratogenic/carcinogenic risks. The synthesized LDH/MIL-101(Fe)/La-Fe-TiO2 composite was systematically characterized using scanning electron microscopy (SEM), UV–Vis diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET) analysis. Key findings revealed that: (1) The composite architecture achieves an exceptional specific surface area of 168.96 m2/g through synergistic LDH/MIL-101(Fe) integration; (2) La–Fe co-doping effectively extends the photoresponse threshold of TiO2 to the visible-light region. Under optimized conditions (25 °C, 300 rpm agitation, 400 W irradiation), the system achieved 96.1 % pyridine degradation (initial concentration: 100 mg/L) within 4 h, following pseudo-first-order kinetics (R2 = 0.99). Remarkably, the catalyst maintained 94.5 % efficiency after five consecutive cycles, demonstrating superior stability. Mechanistic investigations combining GC–MS analysis, electron paramagnetic resonance (EPR) detection, and radical quenching tests identified the reactive species activity sequence as ∙h+ >∙OH> O2−, ultimately elucidating the complete pyridine mineralization pathway.http://www.sciencedirect.com/science/article/pii/S2211715625004084PyridineMIL-101(Fe)La-Fe-TiO2Photocatalysis |
| spellingShingle | Wei Zhang Ku Yu Wang Aihe TiO2 material loaded on LDH/MIL-101(Fe) is doped with La and Fe to effectively remove pyridine: “Performance and mechanism” Results in Chemistry Pyridine MIL-101(Fe) La-Fe-TiO2 Photocatalysis |
| title | TiO2 material loaded on LDH/MIL-101(Fe) is doped with La and Fe to effectively remove pyridine: “Performance and mechanism” |
| title_full | TiO2 material loaded on LDH/MIL-101(Fe) is doped with La and Fe to effectively remove pyridine: “Performance and mechanism” |
| title_fullStr | TiO2 material loaded on LDH/MIL-101(Fe) is doped with La and Fe to effectively remove pyridine: “Performance and mechanism” |
| title_full_unstemmed | TiO2 material loaded on LDH/MIL-101(Fe) is doped with La and Fe to effectively remove pyridine: “Performance and mechanism” |
| title_short | TiO2 material loaded on LDH/MIL-101(Fe) is doped with La and Fe to effectively remove pyridine: “Performance and mechanism” |
| title_sort | tio2 material loaded on ldh mil 101 fe is doped with la and fe to effectively remove pyridine performance and mechanism |
| topic | Pyridine MIL-101(Fe) La-Fe-TiO2 Photocatalysis |
| url | http://www.sciencedirect.com/science/article/pii/S2211715625004084 |
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