scholarly journals Degradation of Carbamazepine by Photo(electro)catalysis on Nanostructured TiO2 Meshes: Transformation Products and Reaction Pathways

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 169 ◽  
Author(s):  
Silvia Franz ◽  
Ermelinda Falletta ◽  
Hamed Arab ◽  
Sapia Murgolo ◽  
Massimiliano Bestetti ◽  
...  
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Advanced Oxidation Processes ◽  
Scale Up ◽  
Advanced Oxidation ◽  
Transformation Products ◽  
Reaction Pathways ◽  
Oxidation Processes ◽  
Electro Catalysis ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Carbamazepine (CBZ) is a pharmaceutical compound recalcitrant to conventional wastewater treatment plants and widely detected in wastewater bodies. In the present study, advanced oxidation processes for carbamazepine removal are investigated, with particular regard to the degradation pathways of carbamazepine by photoelectrocatalysis and conventional photocatalysis. Photoelectrocatalysis was carried out onto TiO2 meshes obtained by Plasma Electrolytic Oxidation, a well-known technique in the field of industrial surface treatments, in view of an easy scale-up of the process. By photoelectrocatalysis, 99% of carbamazepine was removed in 55 min while only 65% removal was achieved by photolysis. The investigation of the transformation products (TPs) was carried out by means of UPLC-QTOF/MS/MS. Several new TPs were identified and accordingly reaction pathways were proposed. Above 80 min the transformation products disappear, probably forming organic acids of low-molecular weight as final degradation products. The results demonstrated that photoelectrocatalysis onto TiO2 meshes obtained by plasma electrolytic oxidation is a useful alternative to common advanced oxidation processes as wastewater tertiary treatment aimed at removing compounds of emerging concern.

Chemical and toxicological evaluation of transformation products during advanced oxidation processes

2013 ◽  
Vol 68 (9) ◽  
pp. 1976-1983 ◽  
Author(s):  
C. vom Eyser ◽  
A. Börgers ◽  
J. Richard ◽  
E. Dopp ◽  
N. Janzen ◽  
...  
Keyword(s):  
Advanced Oxidation Processes ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Advanced Oxidation ◽  
Transformation Products ◽  
Product Formation ◽  
Toxicological Evaluation ◽  
H2o2 Treatment ◽  
Oxidation Processes ◽  
Estrogenic Potential

The entry of pharmaceuticals into the water cycle from sewage treatment plants is of growing concern because environmental effects are evident at trace levels. Ozonation, UV- and UV/H2O2-treatment were tested as an additional step in waste water treatment because they have been proven to be effective in eliminating aqueous organic contaminants. The pharmaceuticals carbamazepine, ciprofloxacin, diclofenac, metoprolol and sulfamethoxazole as well as the personal care products galaxolide and tonalide were investigated in terms of degradation efficiency and by-product formation in consideration of toxic effects. The substances were largely removed from treatment plant effluent by ozonation, UV- and UV/H2O2-treatment. Transformation products were detected in all tested treatment processes. Accompanying analysis showed no genotoxic, cytotoxic or estrogenic potential for the investigated compounds after oxidative treatment of real waste waters. The results indicate that by-product formation from ozonation and advanced oxidation processes does not have any negative environmental impact.

Cyto- and geno-toxicity of 1,4-dioxane and its transformation products during ultraviolet-driven advanced oxidation processes

2018 ◽  
Vol 4 (9) ◽  
pp. 1213-1218 ◽  
Author(s):  
Wei Li ◽  
Elvis Xu ◽  
Daniel Schlenk ◽  
Haizhou Liu
Keyword(s):  
Water Reuse ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Transformation Products ◽  
Oxidation Processes

Ultraviolet-driven advanced oxidation processes (UV/AOPs) are integral steps in water reuse treatment trains.

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