scholarly journals The solar photo-Fenton process at neutral pH applied to microcystin-LR degradation: Fe2+, H2O2 and reaction matrix effects

2020 ◽  
Vol 19 (8) ◽  
pp. 1078-1087
Author(s):  
Joicy Micheletto ◽  
Mariana de Almeida Torres ◽  
Vinícius de Carvalho S. de Paula ◽  
Vânia Eloiza Cerutti ◽  
Thomaz Aurélio Pagioro ◽  
...  
Keyword(s):  
Natural Water ◽  
Water Samples ◽  
Matrix Effects ◽  
Inorganic Ions ◽  
Fenton Process ◽  
Iron Precipitation ◽  
Neutral Ph ◽  
Natural Water Samples ◽  
Reaction Matrix ◽  
Before And After

This work evaluated the efficiency of solar photo-Fenton at near-neutral pH for microcystin-LR degradation in synthetic and natural water samples, and discussed inorganic ions effect, iron precipitation and phytotoxicity before and after the process.

Hydrogen Peroxide Decay in Waters with Suspended Soils: Evidence for Biologically Mediated Processes

1990 ◽  
Vol 47 (5) ◽  
pp. 888-893 ◽  
Author(s):  
William J. Cooper ◽  
Richard G. Zepp
Keyword(s):  
Hydrogen Peroxide ◽  
Natural Water ◽  
Water Samples ◽  
First Order ◽  
Natural Water Samples ◽  
Major Reaction Product ◽  
Major Reaction ◽  
Chemical Sterilization ◽  
Pseudo First Order ◽  
Catalyzed Oxidation

Hydrogen peroxide decay studies have been conducted in suspensions of several well-characterized soils and in natural water samples. Kinetic and product studies indicated that the decay was biologically-mediated, and could be described by pseudo first-order rate expressions. At an initial H2O2 concentration of 0.5 μM, the hydrogen peroxide half-life varied from 1 to 8 h. The decay was inhibited by thermal and chemical sterilization of the soils. Peroxidase activity was inferred in several natural water samples, where the suspended particles catalyzed the oxidation of p-anisidine by hydrogen peroxide. The mass spectrum of the major reaction product indicated that it was the dimer, possibly benzoquinone-4-methoxyanil, a product that also was observed from the horseradish peroxidase-catalyzed oxidation of p-anisidine by hydrogen peroxide.

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