Persulfate activation by reduced graphene oxide membranes: Practical and mechanistic insights concerning organic pollutants abatement
| Autor: | Alberto Cruz-Alcalde, Jaime Giménez, Rui S. Ribeiro, Carme Sans, Adrián M.T. Silva, Núria López-Vinent |
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| Přispěvatelé: | Faculdade de Engenharia |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Grafè
General Chemical Engineering Oxide 02 engineering and technology 010402 general chemistry Plantes de tractament d'aigües residuals 01 natural sciences Industrial and Manufacturing Engineering Catalysis law.invention chemistry.chemical_compound law Oxidizing agent Environmental Chemistry Phenol Chemistry Graphene Singlet oxygen General Chemistry 021001 nanoscience & nanotechnology Persulfate 0104 chemical sciences Membrane Chemical engineering Sewage disposal plant 0210 nano-technology |
| Zdroj: | Dipòsit Digital de la UB Universidad de Barcelona |
| Popis: | The catalytic activity of membranes produced with commercial unmodified reduced graphene oxide (rGO) was demonstrated for the first time in persulfate (PS) activation through experiments performed in continuous mode. Phenol (Ph; C-0 = 5 mg L-1) and venlafaxine (VFX; C-0 = 250 mu g L-1) were employed as model compounds. The influence of the main operation parameters was first investigated considering an operation period of 24 h. For a rGO membrane with an effective area of 2.1 cm(2) , contaminant removal is favored at lower flow rates (0.1 mL min(-1)) and higher catalyst loads (15 mg). Assays carried out under these conditions yielded average removals of 90 and 94% for Ph and VFX, respectively, corresponding to normalized removal rates in the range of 1.71-1.79 L m(-2) h(-1) mg(cat)(-1). Membrane stability tests were conducted in continuous mode for 1 week, allowing to observe a significant catalyst deactivation after 2-3 d of operation, although the catalytic activity could be recovered through simple thermal regeneration procedures. Batch mode oxidation tests employing powder rGO treated at different temperatures (500, 850 and 1000 degrees C) and materials characterization data allowed to conclude that a shift of the surface chemistry character from acidic to basic enhances the catalytic performance. Moreover, scavenging tests indicated that singlet oxygen (O-1(2)), apparently generated by nucleophilic attack of PS to C = O in pyrone-like functionalities, is the main oxidizing species in the rGO-PS system. |
| Databáze: | OpenAIRE |
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