Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1016/j.chemosphere.2020.126712
Document accepted manuscript
Title (Primary) Interaction of zero-valent iron and carbonaceous materials for reduction of DDT
Author Kopinke, F.-D.; Sühnholz, S.; Georgi, A.; Mackenzie, K. ORCID logo
Source Titel Chemosphere
Year 2020
Department TUCHEM
Volume 253
Page From art. 126712
Language 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).
Persistent UFZ Identifier
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