scholarly journals Sonochemical degradation of trimethoprim in water matrices: Effect of operating conditions, identification of transformation products and toxicity assessment

2020 ◽  
Vol 67 ◽  
pp. 105139 ◽  
Author(s):  
Olga S. Arvaniti ◽  
Zacharias Frontistis ◽  
Maria Christina Nika ◽  
Reza Aalizadeh ◽  
Nikolaos S. Thomaidis ◽  
...  
2021 ◽  
Vol 232 (3) ◽  
Author(s):  
Rafaela Tomazini ◽  
Flavia T. Saia ◽  
Bas van der Zaan ◽  
Guilherme M. Grosseli ◽  
Pedro S. Fadini ◽  
...  

2019 ◽  
Vol 26 (36) ◽  
pp. 37174-37192 ◽  
Author(s):  
Marta Gmurek ◽  
João F. Gomes ◽  
Rui C. Martins ◽  
Rosa M. Quinta-Ferreira

AbstractParabens (esters of p-hydroxybenzoic acid) are xenobiosis belonging to endocrine disruptors and commonly used as a preservative in cosmetics, food, pharmaceutical, and personal care products. Their wide use is leading to their appearance in water and wastewater in the range from ng/L to mg/L. In fact, the toxicity of benzylparaben is comparable to bisphenol A. Therefore, it is important to find not only effective but also ecofriendly methods for their removal from aqueous environment since the traditional wastewater treatment approaches are ineffective. Herein, for the first time, such extended comparison of several radical-driven technologies for paraben mixture degradation is presented. The detailed evaluation included (1) comparison of ozone and hydroxyl peroxide processes; (2) comparison of catalytic and photocatalytic processes (including photocatalytic ozonation); (3) characterisation of catalysts using SEM, XRD, DRS, XPS techniques and BET isotherm; (4) mineralisation, biodegradability and toxicity assessment; and (5) cost assessment. O3, H2O2/Fe2+, H2O2/UVC, O3/H2O2, O3/UVA, O3/H2O2/UVA, UVA/catalyst, O3/catalyst and O3/UVA/catalyst were selected from advanced oxidation processes to degrade parabens as well as to decrease its toxicity towards Aliivibrio fischeri, Corbicula fluminea and Lepidium sativum. Research was focused on the photocatalytic process involving visible light (UVA and natural sunlight) and TiO2 catalysts modified by different metals (Ag, Pt, Pd, Au). Photocatalytic oxidation showed the lowest efficiency, while in combining ozone with catalysis and photocatalysis process, degradation efficiency and toxicity removal were improved. Photocatalytic ozonation slightly improved degradation efficiency but appreciably decreased transferred ozone dose (TOD). Results indicate that the degradation pathway is different, or different transformation products (TPs) could be formed, despite that the hydroxyl radicals are the main oxidant.


2017 ◽  
Vol 110 ◽  
pp. 133-140 ◽  
Author(s):  
Oswaldo Gomes Júnior ◽  
Waldomiro Borges Neto ◽  
Antonio E.H. Machado ◽  
Daniela Daniel ◽  
Alam G. Trovó

Chemosphere ◽  
2017 ◽  
Vol 168 ◽  
pp. 284-292 ◽  
Author(s):  
Laura Ferrando-Climent ◽  
Rafael Gonzalez-Olmos ◽  
Alba Anfruns ◽  
Ignasi Aymerich ◽  
Lluis Corominas ◽  
...  

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 899
Author(s):  
Giang Truong Le ◽  
Nguyen Thuy Ta ◽  
Trung Quoc Pham ◽  
Yen Hai Dao

The aim of the present study was to investigate the electrochemical formation of active chlorine and its subsequent use for the degradation of the pesticide fenobucarb. Initially, the process of electrochemical active chlorine production was investigated using an electrochemical flow-cell with a Ti/RuO2 plate electrode. The contribution of four main factors (chloride concentration, current density, the retention time of chloride in the cell (flow rate), and initial pH of inlet solution) to form active chlorine was determined by a central composite design (CCD). The influence of the four variables was statistically significant, and the contributions of flow rate, chloride concentration, pH, and current density were found to be 37.2%, 33.59%, 18.28%, and 10.93%, respectively. A mathematical model was established to predict and optimize the operating conditions for fenobucarb removal in the NaCl electrolysis process. The main transformation products (seven compound structures) were detected by liquid chromatography coupled with high-resolution mass spectrometry (LC–HRMS). The results of the model and transformation products indicated that fenobucarb was degraded due to direct oxidation on the electrode surface, and indirectly by active chlorine and other radicals present during the NaCl electrolysis process.


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