Degradation of pharmaceutical mixtures in aqueous solutions using UV/peracetic acid process: Kinetics, degradation pathways and comparison with UV/H2O2

Chemosphere ◽  
2020 ◽  
Vol 248 ◽  
pp. 125911 ◽  
Author(s):  
Jordan Hollman ◽  
John Albino Dominic ◽  
Gopal Achari
Keyword(s):  
Aqueous Solutions ◽  
Peracetic Acid ◽  
Degradation Pathways ◽  
Process Kinetics ◽  
Acid Process

scholarly journals Photo-transformation of aqueous nitroguanidine and 3-nitro-1,2,4-triazol-5-one : emerging munitions compounds

2021 ◽  
Author(s):  
Julie Becher ◽  
Samuel Beal ◽  
Susan Taylor ◽  
Katerina Dontsova ◽  
Dean Wilcox
Keyword(s):  
Aqueous Solutions ◽  
Degradation Products ◽  
Pure Water ◽  
Transformation Products ◽  
Water Soluble ◽  
Uv Exposure ◽  
Degradation Pathways ◽  
Solution Ph ◽  
Photo Degradation ◽  
Degradation Rates

Two major components of insensitive munition formulations, nitroguanidine (NQ) and 3-nitro-1,2,4-triazol-5-one (NTO), are highly water soluble and therefore likely to photo-transform while in solution in the environment. The ecotoxicities of NQ and NTO solutions are known to increase with UV exposure, but a detailed accounting of aqueous degradation rates, products, and pathways under different exposure wavelengths is currently lacking. We irradiated aqueous solutions of NQ and NTO over a 32-h period at three ultraviolet wavelengths and analyzed their degradation rates and transformation products. NQ was completely degraded by 30 min at 254 nm and by 4 h at 300 nm, but it was only 10% degraded after 32 h at 350 nm. Mass recoveries of NQ and its transformation products were >80% for all three wavelengths. NTO degradation was greatest at 300 nm with 3% remaining after 32 h, followed by 254 nm (7% remaining) and 350 nm (20% remaining). Mass recoveries of NTO and its transformation products were high for the first 8 h but decreased to 22–48% by 32 h. Environmental half-lives of NQ and NTO in pure water were estimated as 4 and 6 days, respectively. We propose photo-degradation pathways for NQ and NTO supported by observed and quantified degradation products and changes in solution pH.

scholarly journals INFLUENCE OF TEMPERATURE AND PH ON THE DECOMPOSITION KINETICS OF PERACETIC ACID IN AQUEOUS SOLUTIONS

2014 ◽  
Vol 44 (3) ◽  
pp. 195-201
Author(s):  
L. KUNIGK ◽  
S. P. GALIZIA ◽  
R.T. K. SHIKISHIMA ◽  
R. GEDRAITE ◽  
C. H. JURKIEWICZ
Keyword(s):  
Activation Energy ◽  
Aqueous Solutions ◽  
Peracetic Acid ◽  
Food Industry ◽  
Decomposition Kinetics ◽  
Order Reaction ◽  
Influence Of Temperature ◽  
First Order ◽  
All Solutions ◽  
Kinetics Of

Peracetic acid (PAA) is a strong oxidant used by the food industry as a sanitizer, in medical area as a disinfectant and by the textiles and paper industries as a bleacher. Its decomposition rate is an important parameter in these applications. The main purpose of this paper is to study the decomposition kinetics of PAA between 25 and 45 °C in solutions with pH 3.11, 5.0 and 7.0. The decomposition of PAA is a first-order reaction for all solutions and temperatures studied. The rate constants were between 2.08·10-3 and 9.44·10-3 h-1 (pH 3.11), between 2.61·10-3 and 16.69·10-3 h-1 (pH 5.0) and between 7.50·10-3 and 47.63·10-3 h-1 (pH 7.0). The activation energy of PAA decomposition in aqueous solutions are 58.36 and 72.89 kJ·mol-1 when pH was 3.11 and 5.0, respectively.

Kinetics and Thermodynamic Investigation of Phosphate Adsorption on AlCl3 Modified Palygorskite

2013 ◽  
Vol 683 ◽  
pp. 530-533
Author(s):  
Yan Zhang ◽  
Xian Jun Lv ◽  
Xiao Yan Kou
Keyword(s):  
Aqueous Solutions ◽  
Langmuir Isotherm ◽  
Goodness Of Fit ◽  
Phosphate Adsorption ◽  
Order Model ◽  
Thermodynamic Investigation ◽  
Process Kinetics ◽  
Pseudo Second Order ◽  
Modified Palygorskite ◽  
Kinetics And Thermodynamic

The potential of AlCl3 modified palygorskite was assessed for adsorption of phosphate from aqueous solutions. The Langmuir isotherm adequately described adsorption with an R2 goodness of fit of 0.9683. The process kinetics was found to follow the pseudo-second-order model. Positive △H and △S values indicated that the adsorption of phosphate onto AlCl3 modified palygorskite was endothermic. Negative △G showed that the adsorption of phosphate onto this sorbent is feasible and spontaneous.

Salinity, dissolved organic carbon and water hardness affect peracetic acid (PAA) degradation in aqueous solutions

2014 ◽  
Vol 60 ◽  
pp. 35-40 ◽  
Author(s):  
Dibo Liu ◽  
Christian E.W. Steinberg ◽  
David L. Straus ◽  
Lars-Flemming Pedersen ◽  
Thomas Meinelt
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Aqueous Solutions ◽  
Peracetic Acid ◽  
Water Hardness

scholarly journals Photodegradation of lincomycin in aqueous solution

2006 ◽  
Vol 2006 ◽  
pp. 1-6 ◽  
Author(s):  
Agatino Di Paola ◽  
Maurizio Addamo ◽  
Vincenzo Augugliaro ◽  
Elisa García-López ◽  
Vittorio Loddo ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Uv Light ◽  
Heterogeneous Systems ◽  
Degradation Pathways ◽  
Direct Photolysis ◽  
First Order ◽  
First Order Kinetics ◽  
Pseudo First Order ◽  
Complete Mineralization

Aqueous solutions of lincomycin were irradiated with UV light in homogeneous and heterogeneous systems. Lincomycin disappeared in both systems but the presence ofTiO2noticeably accelerated the degradation of the antibiotic in comparison with direct photolysis. The rate of decomposition was dependent on the concentration of lincomycin and followed a pseudo-first-order kinetics. Photolysis involved only the oxidation of lincomycin without mineralization. Differently, the treatment withTiO2and UV light resulted in a complete mineralization of the antibiotic. The degradation pathways involved S- and N-demethylation and propyldealkylation. The mineralization of the molecule led to the formation of sulfate, ammonium, and nitrate ions.

Molybdenum disulfide (MoS2) promoted sulfamethoxazole degradation in the Fe(III)/peracetic acid process

2021 ◽  
pp. 119854
Author(s):  
Jingwen Wang ◽  
Zongping Wang ◽  
Yujie Cheng ◽  
Lisan Cao ◽  
Pengchao Xie ◽  
...  
Keyword(s):  
Molybdenum Disulfide ◽  
Peracetic Acid ◽  
Acid Process
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