Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1016/j.chemosphere.2020.126712
Volltext Akzeptiertes Manuskript
Titel (primär) Interaction of zero-valent iron and carbonaceous materials for reduction of DDT
Autor Kopinke, F.-D.; Sühnholz, S.; Georgi, A.; Mackenzie, K. ORCID logo
Quelle Chemosphere
Erscheinungsjahr 2020
Department TUCHEM
Band/Volume 253
Seite von art. 126712
Sprache englisch
Keywords Dechlorination; Zero-valent iron; DDT; Spill over Hydrolysis
Abstract Dechlorination of dichlorodiphenyltrichloroethane (DDT) as a model compound was performed with zero-valent iron (micro-ZVI and nano-ZVI) as reductant and carbonaceous adsorbents as sink and catalyst in water. DDT is rapidly converted to dichlorodiphenyldichloroethane (DDD) in direct contact with ZVI. However, up to 90% of the DDD is transformed into non-identified, most likely oligomeric products. There is no indication of dechlorination at the aromatic rings. DDT is still rapidly dechlorinated when it is adsorbed on carbonaceous adsorbents, even though ZVI particles have no direct access to the adsorbed DDT. The carbonaceous materials function as adsorbent and catalyst for the dechlorination reaction at once. From electrochemical experiments, we deduced that direct physical contact between ZVI particles and the adsorbent is essential for enabling a chemical reaction. Electron conduction alone does not effect any dechlorination reaction. We hypothesize hydrogen species (H∗) which spill from the ZVI surface to the carbon surface and initiate reductive transformations there. The role of carbonaceous adsorbents is different for different degradation pathways: in contrast to hydrodechlorination (reduction), adsorption protects DDT from dehydrochlorination (hydrolysis).
dauerhafte UFZ-Verlinkung
Kopinke, F.-D., Sühnholz, S., Georgi, A., Mackenzie, K. (2020):
Interaction of zero-valent iron and carbonaceous materials for reduction of DDT
Chemosphere 253 , art. 126712 10.1016/j.chemosphere.2020.126712