Persulfate activation by reduced graphene oxide membranes: Practical and mechanistic insights concerning organic pollutants abatement

• Type: Article in International Scientific Journal
• Date: 2022

Authors

Alberto Cruz-Alcalde (Author) Other; Núria López-Vinent (Author) Other; Rui S. Ribeiro (Author) FEUP; Jaime Giménez (Author) Other; Carme Sans (Author) Other; Adrián M.T. Silva (Author) FEUP

Journal

Title: Chemical Engineering Journal

Vol. 427 No. Art. 130994

Pages: 1-9

ISSN: 1385-8947

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 1 Citation

Associated Projects

InSpeCt - Identifying and interrupting micropollutants of EU concern by using Smart Carbon materials

Healthy Waters - Healthy Waters - Identification, Elimination, Social Awareness and Education of Water Chemical and Biological Micropollutants with Health and Environmental Implications

Other information

Authenticus ID: P-00V-4PJ

DOI: 10.1016/j.cej.2021.130994

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9