Topic
Hydrogen peroxide
About: Hydrogen peroxide is a research topic. Over the lifetime, 42583 publications have been published within this topic receiving 1043732 citations. The topic is also known as: H2O2 & dioxidane.
Papers published on a yearly basis
Papers
More filters
TL;DR: A kinetic model for the oxidation of organics in water by the combination of hydrogen peroxide and UV radiation is described in this paper, which is based on literature values for a series of reactions initiated by the photolysis of HOO by UV radiation into hydroxyl radicals.
Abstract: The photolysis of hydrogen peroxide is the basis of a process for the treatment of wastewaters, and for the remediation of contaminated groundwater. A kinetic model for the oxidation of organics in water by the combination of hydrogen peroxide and UV radiation is described. The model is based on literature values for a series of reactions initiated by the photolysis of hydrogen peroxide by UV radiation into hydroxyl radicals, to which is added a term for the direct photolysis of the organic. The model is tested with data on the oxidation of a compound, 1,2-dibromo-3-chloropropane (DBCP), at low levels (< 500 {micro}g/l) in simulated and actual groundwater. The effect of the UV intensity, the initial concentration of hydrogen peroxide, and the various inorganic salts is investigated. Nitrate and bicarbonate/carbonate have a detrimental effect on the rate of oxidation of DBCP, the former due to UV shielding and the latter due to OH radical scavenging. The rate of oxidation of DBCP is enhanced and the optimum peroxide level is lowered at low carbonate alkalinity, suggesting that presoftening of groundwater prior to oxidation of halogenated alkanes should be cost-effective.
226 citations
TL;DR: It is found that enhanced Mn-SOD activity, via an unbalanced H2O2overproduction and detoxification, induces MMP-1 mRNA levels, and this effect is at least partly mediated by the DNA recognition sequence AP-1.
226 citations
TL;DR: The liver is one of the target organs for the toxicity of drugs and chemicals, and a number of drugs can also lead to the activation of oxygen, resulting in highly reactive species of oxygen.
Abstract: The toxic effects of compounds which undergo redox cycling via enzymatic one-electron reduction are reviewed. First of all, the enzymatic reduction of these compounds leads to reactive intermediates, mainly radicals which react with oxygen, whereby superoxide anion radicals are formed. Further oxygen metabolites are hydrogen peroxide, singlet oxygen and hydroxyl radicals. The role of these oxygen metabolites in toxicity is discussed. The occurrence of lipid peroxidation during redox cycling of quinonoide compounds, e.g., adriamycin, and the possible relationship to their toxicity is critically evaluated. It is shown that iron ions play a crucial role in lipid peroxidation induced by redox cycling compounds. DNA damage by metal chelates, e.g., bleomycin, is discussed on the basis of findings that enzymatic redox cycling of a bleomycin-iron complex has been observed. The involvement of hydroxyl radicals in bleomycin-induced DNA damage occurring during redox cycling in cell nuclei is claimed. Redox cycling of other substances, e.g., aromatic amines, is discussed in relation to carcinogenesis. Other chemical groups, e.g., nitroaromatic compounds, hydroxylamines and azo compounds are included. Other targets for oxygen radical attack, e.g., proteins, are also dealt with. It is concluded that oxygen radical formation by redox cycling may be a critical event in toxic effects of several compounds if the protective mechanisms of cells are overwhelmed.
225 citations
TL;DR: In this article, the temperature dependence of the Henry's law constant is expressed by KH = e[A/T−B], where KH is in the units of molar concentration per atm, and T is in degrees Kelvin.
Abstract: The Henry's law constants for aqueous solutions of hydrogen peroxide, methylhydroperoxide, and peroxyacetic acid were measured over the temperature range 278°–293°K. These determinations were made by measuring the vapor pressure of the peroxide in a gas stream of nitrogen or air that was in equilibrium with a solution of known peroxide concentration. The aqueous phase concentrations ranged from 5 × 10−5 M to 5 × 10−3 M for hydrogen peroxide, and from 1 × 10−6 M to 1 × 10−4 M for methylhydroperoxide and peroxyacetic acid. In all cases, Henry's law was obeyed over the concentration range investigated. The temperature dependence of the Henry's law constant is expressed by KH = e[A/T−B], where KH is in the units of molar concentration per atm, and T is in degrees Kelvin. The coefficients' values are A = 6621, B = 11.00 for hydrogen peroxide; A = 5607, B = 13.41 for methylhydroperoxide; and A = 6171, B = 14.55 for peroxyacetic acid. The experimental errors on KH at the 95% confidence level are ±8.3% for hydrogen peroxide, ±11% for methylhydroperoxide, and ±17% for peroxyacetic acid. In addition, the Henry's law behavior of hydrogen peroxide in aqueous solutions of sulfuric acid and ammonium sulfate was investigated. The Henry's law constant of hydrogen peroxide decreased with increasing sulfuric acid concentration and increased with increasing ammonium sulfate concentration.
225 citations
TL;DR: Supported gold–palladium nanoparticles are active for the oxidation of methane, giving a high selectivity for the formation of methyl hydroperoxide and methanol, using hydrogen peroxide as the oxidant.
Abstract: Supported gold–palladium nanoparticles are active for the oxidation of methane, giving a high selectivity for the formation of methyl hydroperoxide and methanol, using hydrogen peroxide as the oxidant (see picture). The optimal methanol selectivity is achieved by performing the reaction in the presence of hydrogen peroxide that has been generated in situ from hydrogen and oxygen.
225 citations