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Main Title: Specific adsorption sites and conditions derived by thermal decomposition of activated carbons and adsorbed carbamazepine
Author(s): Dittmann, Daniel
Eisentraut, Paul
Goedecke, Caroline
Wiesner, Yosri
Jekel, Martin
Ruhl, Aki Sebastian
Braun, Ulrike
Type: Article
Language Code: en
Abstract: The adsorption of organic micropollutants onto activated carbon is a favourable solution for the treatment of drinking water and wastewater. However, these adsorption processes are not sufficiently understood to allow for the appropriate prediction of removal processes. In this study, thermogravimetric analysis, alongside evolved gas analysis, is proposed for the characterisation of micropollutants adsorbed on activated carbon. Varying amounts of carbamazepine were adsorbed onto three different activated carbons, which were subsequently dried, and their thermal decomposition mechanisms examined. The discovery of 55 different pyrolysis products allowed differentiations to be made between specific adsorption sites and conditions. However, the same adsorption mechanisms were found for all samples, which were enhanced by inorganic constituents and oxygen containing surface groups. Furthermore, increasing the loadings led to the evolution of more hydrated decomposition products, whilst parts of the carbamazepine molecules were also integrated into the carbon structure. It was also found that the chemical composition, especially the degree of dehydration of the activated carbon, plays an important role in the adsorption of carbamazepine. Hence, it is thought that the adsorption sites may have a higher adsorption energy for specific adsorbates, when the activated carbon can then potentially increase its degree of graphitisation.
Issue Date: 21-Apr-2020
Date Available: 22-Sep-2020
DDC Class: 500 Naturwissenschaften und Mathematik
600 Technik, Technologie
Subject(s): activated carbon
drinking water
organic micropollutants
adsorption mechanisms
Sponsor/Funder: DFG, 414044773, Open Access Publizieren 2019 - 2020 / Technische Universität Berlin
Journal Title: Scientific Reports
Publisher: Springer Nature
Publisher Place: London
Volume: 10
Article Number: 6695
Publisher DOI: 10.1038/s41598-020-63481-y
EISSN: 2045-2322
Appears in Collections:FG Wasserreinhaltung » Publications

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