Photochemical production of superoxide and hydrogen peroxide from natural organic matter

2011 ◽  
Vol 75 (15) ◽  
pp. 4310-4320 ◽  
Author(s):  
Shikha Garg ◽  
Andrew L. Rose ◽  
T. David Waite
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Photochemical Production

Photochemical production of hydrogen peroxide from natural algicides: decomposition organic matter from straw

2015 ◽  
Vol 17 (8) ◽  
pp. 1455-1461 ◽  
Author(s):  
Hua Ma ◽  
Jie Zhang ◽  
Liyin Tong ◽  
Jixiang Yang
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Wheat Straw ◽  
Natural Organic Matter ◽  
Solar Irradiation ◽  
Photochemical Production ◽  
Production Of Hydrogen ◽  
Simulated Solar Irradiation

The ability of decomposition organic matter from three natural algicides (barley, rice, and wheat straw) and natural organic matter (NOM) isolates to generate hydrogen peroxide under simulated solar irradiation was evaluated in order to understand the mechanism of indirect algae inhibition through a photochemical pathway.

scholarly journals Lability of natural organic matter in freshwater: a simple method for detection using hydrogen peroxide as an indicator

2018 ◽  
Author(s):  
Isabela Carreira Constantino ◽  
Amanda Maria Tadini ◽  
Marcelo Freitas Lima ◽  
Lídia Maria de Almeida Plicas ◽  
Altair Benedito Moreira ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Organic Carbon ◽  
Natural Organic Matter ◽  
Water Samples ◽  
Ultrapure Water ◽  
Model Compounds ◽  
Simple Method ◽  
The Difference ◽  
One Year

Abstract. Natural organic matter (NOM) is an important component for understanding the behavior of pollutants in the environment. A fraction of NOM is considered labile, fresh and less oxidized. In this work, a simple method was developed to distinguish between labile (LOM) and recalcitrant (ROM) organic matter in freshwater samples. Pyruvate, lignin and fulvic acid were chosen as model compounds of labile and recalcitrant NOM. The samples were submitted to kinetic monitoring experiments using hydrogen peroxide. Pyruvate was the best standard for the quantification of LOM (for concetrations up to 2.9 mg L−1). ROM was quantified by measuring the difference between total organic carbon (TOC) and LOM concentrations. Curves obtained with 0.5 to 5.0 mg L−1 TOC (pyruvate) in freshwater or ultrapure water samples did not indicate the existence of a matrix effect. This simple method was applied to water samples that were collected monthly for one year; the resulting LOM concentrations ranged from 0.47 to 2.1 mg L−1 and the ROM concentrations ranged from 0.08 to 3.5 mg L−1. Based on this results we concluded that hydrogen peroxide kinetics can be used as a simple method to quantify LOM and ROM concentrations in freshwater samples.

scholarly journals Removal of natural organic matter in waters using hydrodynamic cavitation and hydrogen peroxide (HC-H2O2)

2020 ◽  
Vol 24 ◽  
pp. e29
Author(s):  
Matheus Neves de Araujo ◽  
Thiago Vinicius Ribeiro Soeira ◽  
Cristiano Poleto ◽  
Elias Gabriel Fernandes de Rezende ◽  
Otávio Augusto Puglieri Cappa ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Advanced Oxidation Process ◽  
Reaction Medium ◽  
Molecular Structures ◽  
Hydrodynamic Cavitation ◽  
Acidic Ph ◽  
Early 21St Century ◽  
Supply Water

The presence of natural organic matter (NOM) in water does not present direct risk to the human body or to the environment. However, its presence along with other pollutants can lead to countless issues and damage human health and the environment. The hydrodynamic cavitation (HC) phenomenon started being used in the early 21st century as a process capable of treating supply-water and wastewater based on pollutant and pathogen degradation. Process effectiveness increases when it is combined to chemical agents, creating an advanced oxidation process (AOP). Although several studies have presented broaden applications for the HC process, its use for NOM removal from supply-water was not yet assessed; therefore, it remains a gap in scientific knowledge. The aim of the current study is to assess HC potential in NOM removal. In order to do so, the experiments were carried out in bench scale hydrodynamic cavitation system operated at batch model within 15-min duration period-of-time. In addition, decantation experiments (24-h period-of-time) were performed in order to check HC influence on molecules found in reaction medium after the exposure of NOM to the phenomenon. NOM was produced by a synthetic humic acid (HA) matrix at fixed concentration of 100 ppm. In total, 16 experiments were carried out; each experiment was featured by the following pair: pH (2.6, 3.0, 3.5 and 5.5) and hydrogen peroxide (0, 1, 5 and 30 mL). The best removal efficiencies (34%-36%) were observed in the most acidic pH ranges (2.6-3.0) at H2O2 concentration of 15mL. Results have presented high NOM removal efficiency (approximately 90%) after decantation at the most acidic pH ranges, as well. It can be explained by the fact that hydrodynamic cavitation in acid solution can break molecular structures suspended in the liquid medium, which favors decantation. Based on the present study, hydrodynamic cavitation with hydrogen peroxide addition can remove NOM from water; moreover, pH control is an essential factor for process development.

The effects of dissolved organic matter on the decomposition of di-n-butyl phthalate by ozone/hydrogen peroxide process

2004 ◽  
Vol 49 (4) ◽  
pp. 57-62 ◽  
Author(s):  
K. Kosaka ◽  
H. Yamada ◽  
H. Tsuno ◽  
Y. Shimizu ◽  
S. Matsui
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Natural Organic Matter ◽  
Surface Waters ◽  
Municipal Sewage ◽  
Ozone Decomposition ◽  
Ultraviolet Absorbance ◽  
Butyl Phthalate ◽  
H2o2 Addition

The effects of the dissolved organic matter (DOM) on the ozone decay and the di-n-butyl phthalate (DBP) decomposition during ozone/hydrogen peroxide (O3/H2O2) process were investigated (DBP-d4 was used instead of DBP). Four surface waters, two secondary municipal sewage effluents (SMSEfs) and Suwannee river natural organic matter were used as DOM. The ozone decompositions in the DOM solutions were separated by instantaneous ozone consumption and slower ozone decay. The effect of H2O2 addition on the ozone decay was clearly observed at slower ozone decay. Ozone decomposition rate at slower ozone decay increased linearly with H2O2 dose. DBP-d4 was exponentially decreased with ozone consumption. Ozone consumption required to decompose 90% of DBP-d4 ((ΔO3)90%) in SMSEFs was higher than those in surface waters. The (ΔO3)90% per DOC of DOM values were from 22 to 23 μmole/mgC for SMSEFs and from 10 to 17 μmole/mgC for surface waters. The (ΔO3)90% values were correlated to specific ultraviolet absorbance at 254 nm (SUVA254) for surface waters.

scholarly journals Hybrid Adsorptive and Oxidative Removal of Natural Organic Matter Using Iron Oxide-Coated Pumice Particles

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Sehnaz Sule Kaplan Bekaroglu ◽  
Nevzat Ozgu Yigit ◽  
Bilgehan Ilker Harman ◽  
Mehmet Kitis
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Iron Oxide ◽  
Natural Organic Matter ◽  
Product Formation ◽  
Hybrid Process ◽  
Oxide Surfaces ◽  
Wide Range ◽  
And Control ◽  
Oxidation Mechanisms

The aim of this work was to combine adsorptive and catalytic properties of iron oxide surfaces in a hybrid process using hydrogen peroxide and iron oxide-coated pumice particles to remove natural organic matter (NOM) in water. Experiments were conducted in batch, completely mixed reactors using various original and coated pumice particles. The results showed that both adsorption and catalytic oxidation mechanisms played role in the removal of NOM. The hybrid process was found to be effective in removing NOM from water having a wide range of specific UV absorbance values. Iron oxide surfaces preferentially adsorbed UV280-absorbing NOM fractions. Furthermore, the strong oxidants produced from reactions among iron oxide surfaces and hydrogen peroxide also preferentially oxidized UV280-absorbing NOM fractions. Preloading of iron oxide surfaces with NOM slightly reduced the further NOM removal performance of the hybrid process. Overall, the results suggested that the tested hybrid process may be effective for removal of NOM and control disinfection by-product formation.

Effect of several natural water constituents on bromate formation during ozonation

2002 ◽  
Vol 2 (5-6) ◽  
pp. 501-507
Author(s):  
R. Hofmann ◽  
S. Larcher ◽  
R. Andrews
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Natural Water ◽  
Pure Water ◽  
Radical Scavenging ◽  
Oh Radical ◽  
Water Constituents ◽  
Ammonia Bicarbonate ◽  
Synthetic Water

Synthetic water matrices containing ammonia, bicarbonate, hydrogen peroxide, and natural organic matter were studied to identify the effects of these compounds (individually and in combination) on bromate formation. Ammonia alone was observed to significantly reduce bromate formation through the sequestering of brominated intermediates as bromamines. Natural organic matter reacted quickly with bromamines, which could impair the ability of ammonia to block bromate formation. Bicarbonate was observed to generally promote bromate formation in otherwise pure water, but bicarbonate worked synergistically with ammonia to reduce bromate formation by a greater factor than ammonia alone, due to OH radical scavenging. Experiments showed that hydrogen peroxide lowered the effectiveness of ammonia to block bromate formation.

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