Insights into the degradation process of phenol during in-situ thermal desorption: The overlooked oxidation of hydroxyl radicals from oxygenation of reduced Fe-bearing clay minerals

Autor:	Wenwen Zhang, Xiaodong Li, Jialun Shen, Zongquan Sun, Xuefei Zhou, Fasheng Li, Fujun Ma, Qingbao Gu
Rok vydání:	2022
Předmět:	Minerals Environmental Engineering Phenol Phenols Hydroxyl Radical Health Toxicology and Mutagenesis Environmental Chemistry Clay Pollution Waste Management and Disposal Ferric Compounds
Zdroj:	Journal of hazardous materials. 444
ISSN:	1873-3336
Popis:	In-situ thermal desorption (ISTD) has attracted increasing attention owing to the efficient removal of organic contaminants from contaminated sites. However, it is poorly understood that whether and to what extent contamination degradation occurs upon oxygenation of reduced Fe-bearing clay minerals (RFC) in the subsurface during ISTD. In this study, we evaluated the mechanism of contaminant degradation upon oxygenation of reduced clay minerals during the ISTD. Reduced nontronite (rNAu-2) and montmorillonite (rSWy-3) were selected as RFC models. Results showed that thermal treatment during ISTD could significantly enhance phenol degradation, which increased from 25.8 % at 10 °C to 74.4 % at 70 °C in rNAu-2 and from 17.7 % at 10 °C to 49.8 % at 70 °C in rSWy-3. Correspondingly, the cumulative •OH at steady-state ([•OH]
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::13178c98ae719b292898dbc1e2cd94f3 https://pubmed.ncbi.nlm.nih.gov/36403451 Zobrazit plný text záznamu Full Text from ScienceDirect