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Article

Layered Double Hydroxides with Intercalated Permanganate and Peroxydisulphate Anions for Oxidative Removal of Chlorinated Organic Solvents Contaminated Water

1
Grupo de Investigación Reconocido—Química del Estado Sólido, Materiales y Catálisis Heterogénea (GIR-QUESCAT), Departamento de Química Inorgánica, Universidad de Salamanca, 37008 Salamanca, Spain
2
Institute of Earth Sciences, University of Iceland, Sturlugata 7, 101 Reykjavík, Iceland
3
Departamento de Química Analítica, Nutrición y Bromatología, Universidad de Salamanca, 37008 Salamanca, Spain
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(5), 462; https://doi.org/10.3390/min10050462
Received: 9 April 2020 / Revised: 7 May 2020 / Accepted: 18 May 2020 / Published: 20 May 2020
The contamination by chlorinated organic solvents is a worldwide problem as they can deeply penetrate aquifers, accumulating in the sub-surface as lenses of highly hazardous pollutants. In recent years, so called in situ oxidation processes have been developed to remediate chlorinated organic solvents from groundwater and soil by injecting solutions of oxidising agents such as permanganate or peroxydisulphate. We here present modified layered double hydroxides (LDHs) with intercalated oxidising agents that might serve as new reactants for these remediation strategies. LDHs might serve as support and stabiliser materials for selected oxidising agents during injection, as the uncontrolled reaction and consumption might be inhibited, and guarantee that the selected oxidants persist in the subsurface after injection. In this study, LDHs with hydrotalcite- and hydrocalumite-like structures intercalated with permanganate and peroxydisulphate anions were synthesised and their efficiency was tested in batch experiments using trichloroethene or 1,1,2-trichloroethane as the target contaminants. All samples were characterised using powder X-ray diffraction, thermal analysis coupled with mass spectrometry to directly analyse evolving gases, and Fourier-transform infrared spectroscopy. Additionally, particle size distribution measurements were carried out on the synthesised materials. Results of the batch experiments confirmed the hypothesis that oxidising agents keep their properties after intercalation. Permanganate intercalated LDHs proved to be most efficient at degrading trichloroethene while peroxydisulphate intercalated Ca,Al-LDHs were the most promising studied reactants degrading 1,1,2-trichloroethane. The detection of dichloroethene as well as the transformation of the studied reactants into new LDH phases confirmed the successful degradation of the target contaminant by oxidation processes generated from the intercalated oxidising agent. View Full-Text
Keywords: LDHs; hydrocalumite; oxidizing agents LDHs; hydrocalumite; oxidizing agents
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MDPI and ACS Style

Dietmann, K.M.; Linke, T.; Nogal Sánchez, M.d.; Pérez Pavón, J.L.; Rives, V. Layered Double Hydroxides with Intercalated Permanganate and Peroxydisulphate Anions for Oxidative Removal of Chlorinated Organic Solvents Contaminated Water. Minerals 2020, 10, 462. https://doi.org/10.3390/min10050462

AMA Style

Dietmann KM, Linke T, Nogal Sánchez Md, Pérez Pavón JL, Rives V. Layered Double Hydroxides with Intercalated Permanganate and Peroxydisulphate Anions for Oxidative Removal of Chlorinated Organic Solvents Contaminated Water. Minerals. 2020; 10(5):462. https://doi.org/10.3390/min10050462

Chicago/Turabian Style

Dietmann, Karen M., Tobias Linke, Miguel d. Nogal Sánchez, José L. Pérez Pavón, and Vicente Rives. 2020. "Layered Double Hydroxides with Intercalated Permanganate and Peroxydisulphate Anions for Oxidative Removal of Chlorinated Organic Solvents Contaminated Water" Minerals 10, no. 5: 462. https://doi.org/10.3390/min10050462

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