Effect of oxidation and catalytic reduction of trace organic contaminants on their activated carbon adsorption
| Autor: | Klaas Schoutteten, D. de Ridder, Tom Hennebel, Michael Chys, Synthia Maes, Ellen Dheere, C. Bertelkamp, Julie Vanden Bussche, Stijn Van Hulle, Lynn Vanhaecke, Arne Verliefde |
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| Rok vydání: | 2016 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis 0208 environmental biotechnology Inorganic chemistry 02 engineering and technology 010501 environmental sciences Diatrizoate 01 natural sciences Redox Catalysis chemistry.chemical_compound Adsorption Ozone Dinoseb Nitriles medicine Environmental Chemistry Reactivity (chemistry) Atrazine Environmental Restoration and Remediation 0105 earth and related environmental sciences Chemistry Public Health Environmental and Occupational Health Selective catalytic reduction General Medicine General Chemistry Pollution 020801 environmental engineering Carbamazepine Charcoal 2 4-Dinitrophenol Oxidation-Reduction Water Pollutants Chemical Activated carbon medicine.drug |
| Zdroj: | Chemosphere. 165 |
| ISSN: | 1879-1298 |
| Popis: | The combination of ozonation and activated carbon (AC) adsorption is an established technology for removal of trace organic contaminants (TrOCs). In contrast to oxidation, reduction of TrOCs has recently gained attention as well, however less attention has gone to the combination of reduction with AC adsorption. In addition, no literature has compared the removal behavior of reduction vs. ozonation by-products by AC. In this study, the effect of pre-ozonation vs pre-catalytic reduction on the AC adsorption efficiency of five TrOCs and their by-products was compared. All compounds were susceptible to oxidation and reduction, however the catalytic reductive treatment proved to be a slower reaction than ozonation. New oxidation products were identified for dinoseb and new reduction products were identified for carbamazepine, bromoxynil and dinoseb. In terms of compatibility with AC adsorption, the influence of the oxidative and reductive pretreatments proved to be compound dependent. Oxidation products of bromoxynil and diatrizoic acid adsorbed better than their parent TrOCs, but oxidation products of atrazine, carbamazepine and dinoseb showed a decreased adsorption. The reductive pre-treatment showed an enhanced AC adsorption for dinoseb and a major enhancement for diatrizoic acid. For atrazine and bromoxynil, no clear influence on adsorption was noted, while for carbamazepine, the reductive pretreatment resulted in a decreased AC affinity. It may thus be concluded that when targeting mixtures of TrOCs, a trade-off will undoubtedly have to be made towards overall reactivity and removal of the different constituents, since no single treatment proves to be superior to the other. |
| Databáze: | OpenAIRE |
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