Interaction of tannic acid with ferric iron to assist 2,4,6-trichlorophenol catalytic decomposition and reuse of ferric sludge as a source of iron catalyst in Fenton-based treatment
| Autor: | Marina Trapido, Anna Goi, Juri Bolobajev |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
inorganic chemicals
Process Chemistry and Technology Inorganic chemistry macromolecular substances 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Catalysis chemistry.chemical_compound Reaction rate constant chemistry 2 4 6-Trichlorophenol Tannic acid medicine Ferric Hydroxyl radical Sewage treatment 0210 nano-technology Dissolution 0105 earth and related environmental sciences General Environmental Science medicine.drug |
| Zdroj: | Applied Catalysis B: Environmental. 187:75-82 |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2016.01.015 |
| Popis: | A comprehensive study of the catalytic behaviour of Fe3+ in the presence of tannic acid during the Fenton-based treatment of chlorophenols-contaminated water was performed. The ability of the iron-containing sludge to catalyse the Fenton-based process was assessed and the mechanistic behaviour of tannic acid in the iron dissolution was evaluated. Tannic acid, a constituent of pulp and paper industry water effluent and natural water, enhanced the 2,4,6-trichlorophenol catalytic decomposition in Fe3+-activated H2O2 oxidation system by reducing of the Fe3+. The Fe3+ reductive mechanism by tannic acid incorporated tannic acid–Fe3+ complex formation and decay through an electron transfer reaction to form Fe2+. An indirect measurement of hydroxyl radical (HO ) by the deoxyribose method indicated a considerable increase in HO by Fe3+/H2O2 in the presence of tannic acid. A pseudo-first reaction rate constant of 2,4,6-trichlorophenol degradation by Fe2+/H2O2 was high and close to that of Fe3+/H2O2 with tannic acid. Degradation of tannic acid along with that of 2,4,6-trichlorophenol required optimization of H2O2 and Fe3+ dosages to balance HO formation and scavenging. Acidic reaction media (pH 3.0) and the presence of tannic acid favoured 2,4,6-trichlorophenol degradation by H2O2 oxidation induced by iron dissolved from ferric oxyhydroxide sludge. The reuse of ferric oxyhydroxide sludge as a catalyst source in the Fenton–based process can minimise the production of hazardous solid waste and the overall cost of the treatment. This study highlights the ability of tannic acid-Fe3+ complexes to participate in Fe3+ reductive pathway and, as a result, to allow reuse of non-regenerated ferric oxyhydroxide sludge for activation of H2O2 oxidation in wastewater treatment at acidic pH. |
| Databáze: | OpenAIRE |
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