Evaluation of water matrix effects, experimental parameters, and the degradation pathway during the TiO2photocatalytical treatment of the antibiotic dicloxacillin

2014 ◽  
Vol 50 (1) ◽  
pp. 40-48 ◽  
Author(s):  
Paola Villegas-Guzman ◽  
Javier Silva-Agredo ◽  
Duván González-Gómez ◽  
Ana L. Giraldo-Aguirre ◽  
Oscar Flórez-Acosta ◽  
...  
Keyword(s):  
Matrix Effects ◽  
Degradation Pathway ◽  
Water Matrix ◽  
Experimental Parameters

scholarly journals Photo degradation kinetics of insensitive munitions constituents nitroguanidine, nitrotriazolone, and dinitroanisole in natural waters

2021 ◽  
Author(s):  
Lee Moores ◽  
Stacy Jones ◽  
Garrett George ◽  
David Henderson ◽  
Timothy Schutt
Keyword(s):  
Laboratory Experiments ◽  
Natural Waters ◽  
Matrix Effects ◽  
Degradation Kinetics ◽  
Relative Rate ◽  
Ph Dependence ◽  
Degradation Pathway ◽  
Quantum Yields ◽  
The Individual ◽  
Kinetics Of

Herein the matrix effects on the kinetics of aqueous photolysis for the individual munitions constituents of IMX-101: nitroguanidine (NQ), dinitroanisole (DNAN), and nitrotriazolone (NTO) are reported along with the environmentally relevant kinetics and quantum yields. Photolysis potentially represents a major degradation pathway for these munitions in the environment and further understanding the complex matrices effects on photolytic kinetics was needed. Aqueous systems are of particular interest due to the high solubility of NQ (3,800 ppm) and NTO (16,642 ppm) compared to the traditional munitions trinitrotoluene (TNT, 100.5 ppm) and 1,3,5-trinitro-1,3,5-triazine (RDX, 59.9 ppm). Environmental half-lives (and quantum yields) were found to be 0.44 days, 0.83 days, and 4.4 days for NQ, DNAN, and NTO, respectively, under natural sunlight. In laboratory experiments using nominally 300 nm bulbs in a merry-go-round style reactor in DI water the relative rate of photolysis for the three munitions constituents followed the same order NQ > DNAN > NTO, where DNAN and NTO reacted 57 and 115 times more slowly, respectively, than NQ. In the various environmentally relevant matrices tested in the laboratory experiments NQ was not significantly affected, DNAN showed a faster degradation with increasing ionic strength, and NTO showed a modest salinity and pH dependence on its rate of photolysis.

scholarly journals Ozone-Based Advanced Oxidation Processes for Primidone Removal in Water using Simulated Solar Radiation and TiO2 or WO3 as Photocatalyst

Molecules ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1728 ◽  
Author(s):  
Manuel A. Figueredo ◽  
Eva M. Rodríguez ◽  
Manuel Checa ◽  
Fernando J. Beltran
Keyword(s):  
Transformation Products ◽  
Degradation Pathway ◽  
Secondary Effluent ◽  
Ultrapure Water ◽  
Visible Radiation ◽  
Beneficial Effects ◽  
Photocatalytic Ozonation ◽  
Toc Removal ◽  
Water Matrix ◽  
Environmentally Safe

In this work, primidone, a high persistent pharmacological drug typically found in urban wastewaters, was degraded by different ozone combined AOPs using TiO2 P25 and commercial WO3 as photocatalyst. The comparison of processes, kinetics, nature of transformation products, and ecotoxicity of treated water samples, as well as the influence of the water matrix (ultrapure water or a secondary effluent), is presented and discussed. In presence of ozone, primidone is rapidly eliminated, with hydroxyl radicals being the main species involved. TiO2 was the most active catalyst regardless of the water matrix and the type of solar (global or visible) radiation applied. The synergy between ozone and photocatalysis (photocatalytic ozonation) for TOC removal was more evident at low O3 doses. In spite of having a lower band gap than TiO2 P25, WO3 did not bring any beneficial effects compared to TiO2 P25 regarding PRM and TOC removal. Based on the transformation products identified during ozonation and photocatalytic ozonation of primidone (hydroxyprimidone, phenyl-ethyl-malonamide, and 5-ethyldihydropirimidine-4,6(1H,5H)-dione), a degradation pathway is proposed. The application of the different processes resulted in an environmentally safe effluent for Daphnia magna.

Elimination of trichloroanisoles by UV/H2O2: Kinetics, degradation mechanism, water matrix effects and toxicity assessment

Chemosphere ◽  
2019 ◽  
Vol 230 ◽  
pp. 258-267 ◽  
Author(s):  
Huanhuan Zhu ◽  
Ruibao Jia ◽  
Shaohua Sun ◽  
Guixue Feng ◽  
Mingquan Wang ◽  
...  
Keyword(s):  
Matrix Effects ◽  
Degradation Mechanism ◽  
Toxicity Assessment ◽  
Water Matrix

Sensory and chemical analysis methods for earthy and musty odours in drinking water caused by geosmin and 2-methylisoborneol

2006 ◽  
Vol 6 (3) ◽  
pp. 147-155 ◽  
Author(s):  
Z. Wang ◽  
I.H. Suffet ◽  
Al-Samarrai
Keyword(s):  
Drinking Water ◽  
Early Detection ◽  
Chemical Analysis ◽  
Matrix Effects ◽  
Chemical Compounds ◽  
Sensory Properties ◽  
Potential Treatment ◽  
Water Matrix ◽  
Analysis Methods ◽  
Panel Studies

Earthy and musty odours are amongst the most frequently observed objectionable odours in water supplies, and geosmin and 2-methylisoborneol are identified as the chemical compounds most closely associated with these odours. In this paper, the sensory properties, and the water matrix effects on taste and odour panel studies, as well as the chemical analysis methods for earthy and musty odours in drinking water caused by geosmin and 2-methylisoborneol, are reviewed. Insights are developed to enable better evaluation of earthy and musty odours in drinking water. Early detection of geosmin and MIB can prevent off-flavour occurrence by providing information for potential treatment.

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