Hydrothermal Conversion of Triclosan—The Role of Activated Carbon as Sorbent and Reactant
Autor: | Barbara Weiner, Sarah Sühnholz, Frank-Dieter Kopinke |
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Rok vydání: | 2017 |
Předmět: |
Sorbent
Inorganic chemistry 02 engineering and technology 010501 environmental sciences 01 natural sciences Hydrothermal circulation chemistry.chemical_compound Adsorption medicine Environmental Chemistry Reactivity (chemistry) 0105 earth and related environmental sciences Aqueous solution Chemistry General Chemistry Hydrogen-Ion Concentration 021001 nanoscience & nanotechnology Triclosan Charcoal Yield (chemistry) 0210 nano-technology Nuclear chemistry Activated carbon medicine.drug |
Zdroj: | Environmental Science & Technology. 51:1649-1653 |
ISSN: | 1520-5851 0013-936X |
DOI: | 10.1021/acs.est.6b05314 |
Popis: | Triclosan (TCS) was treated under hydrothermal conditions at 240 °C for 4 h, either dissolved in aqueous solution or preadsorbed onto activated carbon (AC). Hydrothermal conversion of dissolved TCS led to formation of 2,8-dichlorodibenzo-p-dioxin (DCDD). Its yield was dependent on the pH of the aqueous solution increasing from 38% at pH 4 up to 67% at pH 12. Adsorption of TCS at neutral pH on three different kinds of ACs, powder, granular, and felt, changed the reactivity of the TCS molecule under hydrothermal conditions significantly. The conversion of TCS and, in particular, the formation of DCDD was inhibited in the presence of ACs. When TCS was adsorbed on powdered AC, the preferred reaction pathway was the reductive hydrodechlorination. The findings described herein may be valuable for a potential regeneration method for loaded AC based on hydrothermal treatment. |
Databáze: | OpenAIRE |
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