Influence Of Peroxide Research Articles

Evaluation of Triticale Yield under the Influence of Hydrogen Peroxide in the Presence of Oxidative Catalysts

An experimental assessment of the effect of activators of oxidative processes on the yield of triticale grain crops was carried out at experimental sites of the Federal Agrarian Scientific Center of the South-East, Saratov. Triticale plants during the growing season were sprayed with an aqueous solution of hydrogen peroxide with a concentration of 5 mmol/l in the presence of oxidative catalysts based on oxygen-containing compounds: 2-butanone, 1-tetralone, cyclohexanone. The effectiveness of the use of all catalysts used in this work is shown. The best results were obtained by double treatment with an aqueous solution of cyclohexanone in hydrogen peroxide with a concentration of 5 mmol/l in a ratio of 1: 300, carried out 4 and 3 weeks before the start of harvesting, which led to an increase in the yield of triticale grain by 176% relative to the control. Hydrogen peroxide is an additional source of oxygen that accelerates metabolism in plants. An even greater activation of metabolic processes in plants occurred in the presence of oxidative catalysts (2-butanone, 1-tetralone, cyclohexanone), due to the formation of highly active oxygen-containing structures in aqueous solutions, which ultimately led to higher yields of cultivated plants, in particular triticale.

Methods for the destruction of oxalic acid decontamination effluents

Oxalic acid is encountered within industrial processes, spanning from the nuclear sector to various chemical applications. The persistence and potential environmental risks associated with this compound underscore the need for effective management strategies. This article presents an overview of different approaches for the destruction of oxalic acid. The study explores an array of degradation methodologies and delves into the mechanistic insights of these techniques. Significant attention is channeled towards the nuclear industry, wherein oxalic acid arises as a byproduct of decontamination and waste management activities. An integral aspect of decommissioning efforts involves addressing this secondary waste-form of oxalic acid. This becomes imperative due to the potential release of oxalic acid into waste streams, where its accommodation is problematic, and its capacity to solubilize and transport heavy metals like Pu is a concern. To address this, a two-tiered classification is introduced: high concentration and low concentration scenarios. The study investigates various parameters, including the addition of nitric acid or hydrogen peroxide, in the presence of metallic ions, notably Mn2+ and Fe2+. These metallic ions are common components of effluents from metallic waste treatment. Additionally, the impact of UV light on degradation is explored. Investigations reveal that at high concentrations and with the influence of hydrogen peroxide, the presence of metallic cations accelerates the rate of destruction, demonstrating a direct correlation. This acceleration is further enhanced by exposure to UV light. At low concentrations, similar effects of metallic cations are observed upon heating the solution to 80°C. The rate of destruction increases proportionally with hydrogen peroxide concentration, with an optimal oxalic acid to hydrogen peroxide ratio of 1:100. Interestingly, a low-power UV light exerted no discernible effects on the destruction rate; heating alone proved sufficient. In essence, regardless of concentration, the degradation of oxalic acid with hydrogen peroxide experiences acceleration in the presence of metallic ions such as Mn2+ and Fe2+.

Influence of Hydrogen Peroxide on Composition, Thermostability, Porosity and Swelling of Collagen Matrices of Demineralized Porcine Cortical Bone

Influence of Hydrogen Peroxide on Composition, Thermostability, Porosity and Swelling of Collagen Matrices of Demineralized Porcine Cortical Bone

Study of enhancing photocatalytic activity of solvothermal grown MoS2 nanocrystals under visible light irradiation by the influence of hydrogen peroxide

In this article, two-dimensional molybdenum sulfide has been synthesized by simple and conventional solvothermal methods and the combined effect of MoS2 nanocrystals and hydrogen peroxide in photocatalytic degradation of methylene blue (MB) in water has been investigated under visible light. Synthesized MoS2 nanocrystals have been characterised by FEG-TEM, FE-SEM, XRD, Raman, FTIR, UV–Vis absorption, PL and TCSPC studies. FEG-TEM and FE-SEM images confirm nanosheets/nanoflowers like morphology and Raman & XRD patterns confirm the 2H-MoS2 phase. Layer-dependent absorption spectra and its Tauc plot were studied and the calculated band gap are found to be 1.73 eV and 1.43 eV for a few layers, bulk MoS2 respectively. This layer-dependent band gap energy is also verified by calculating electronic band structure for mono-layer, bi-layer and bulk MoS2 through density functional theory (DFT). The calculated average lifetime of in MoS2 is 1.5 ns. The kinetic study of the degradation of MB dye with MoS2 in the presence of H2O2 showed complete degradation of MB within 20 min. Whereas, pure MoS2 and H2O2 showed 28.27 % and 89.2 % degradation of MB within 210 min time intervals respectively. Thus, these results show MoS2 has good photocatalytic activity in the presence of H2O2.

THE INHIBITION OF AUTOPHAGY AND APOPTOSIS BY INSULIN AS A BASIS OF ITS NEUROPROTECTIVE ACTION ON RAT BRAIN CORTICAL NEURONS UNDER CONDITIONS OF OXIDATIVE STRESS IN VITRO

Insulin is one of the most promising neuroprotectors. A significant gap in understanding the mechanism of its action is the lack of data on whether it is able to prevent autophagic neuronal death. The aim of our work was to evaluate the contribution of autophagy and apoptosis to the death of rat cerebral cortex neurons in culture under oxidative stress and to study the ability of insulin to prevent this death and inhibit autophagy and apoptosis in neurons. The influence of hydrogen peroxide and insulin on the level of two main autophagy markers (LC3B-II and SQSTM1/p62) and apoptosis marker (cleaved сaspase-3) was studied. To assess the viability of neurons, the MTT test was used, and Western blotting was applied to measure the level of marker proteins. It was found that oxidative stress caused the activation of autophagy and apoptosis in neurons. This is manifested in a significant increase of the autophagy marker LC3B-II and apoptosis marker (cleaved сaspase-3) and in a decrease in the SQSTM1/p62 protein level. The content of SQSTM1/p62, which is involved in the formation of autophagosomes, decreases with the activation of autophagy, as this protein is degraded in lysosomes. Hydrogen peroxide causes autophagic and apoptotic death of neurons, as the inhibitors of autophagy (3-methyl adenine) and apoptosis (z-DEVD-FMK) were shown to increase the viability of neurons in conditions of oxidative stress. Insulin, in its turn, prevents the death of neurons and hinders autophagy, causing a decrease of the level of lipidated form LC3B-II and the increase of the SQSTM1/p62 protein level, it hinders apoptosis as well decreasing the level of cleaved caspase-3. The protective effect of insulin is mediated by the activation of specific signaling pathways associated with receptors of insulin and IGF-1, as the inhibitor of these receptors BMS-754807 completely blocks the neuroprotective effect of insulin. Thus, the pronounced activation of autophagy under oxidative stress is one of the causes of neuron death, and the protection of neurons by insulin is associated with the suppression of not only apoptotic, but also autophagic cell death.

Influence of hydrogen peroxide on hatching of nauplii Artemia sp.

Nauplii of the brine shrimp Artemia sp. are the optimal starter food for many fish and crustaceans species. For this reason, technologies for their production are being improved, including the activation of cysts. The effect of different concentrations of hydrogen peroxide on hatching process a as activator was studied. Its optimal concentration has been determined; it amounts to 0.2-0.4 ml/l. The reasons for various impacts of hydrogen peroxide on different Artemia cysts are formulated. The dynamic of brine shrimp hatching with and without the activator was studied. It has been established that the addition of a hydrogen peroxide solution as an activator increases the hatching of Artemia nauplii, however, it does not impress on the rapidity of Artemia nauplii release from cysts.

Extraction of iron from laterite soil and green synthesis of laterite nano iron catalyst (GLaNICs) for its application as Fenton's catalyst in the degradation of triclosan.

Laterite based nano iron particles were synthesized using natural laterite extract as a precursor and Psidium guajava plant extract for its application as Fenton's catalyst in the degradation of triclosan. Chemical digestion method was used for the extraction of iron from laterite soil. Synthesized nano iron catalyst was characterized using SEM-EDS, XRD and FTIR and evaluated for its catalytic application in the Fenton's oxidation of triclosan. Maximum triclosan degradation of 69.5% was observed with nano iron catalyst dosage of 0.1 g/L and hydrogen peroxide dosage of 200 mg/L at acidic pH of 3. Hydrogen peroxide influence on the process was observed with Fenton's oxidation. Role of iron in the process has been accessed by control experiment with no nano catalyst addition in which degradation is considerably low. Fenton's oxidation was compared with conventional Fenton's oxidation driven by a green nano iron catalyst. Study claims the usage of natural laterite iron as a replacement for commercial iron in Fenton's degradation of triclosan. Regeneration and reusability studies on catalyst were studied and synthesized catalyst was observed to be reusable in three consecutive cycles. Degradation of triclosan in Fenton's oxidation follows pseudo-second order reaction with linear fit.

Synthesis of calcined kaolin-based geopolymer foam: Assessment of mechanical properties, thermal insulation, and elevated temperature stability

Calcined kaolin-based geopolymer foam was prepared, characterized, and evaluated in this paper. The different hydrogen peroxide foaming agent dosages were added to the geopolymer paste at 2.5%, 5%, 7.5%, and 10 wt%. The specimens were cured at temperatures of 40 °C, 60 °C, and 80 °C. The influence of hydrogen peroxide and different curing temperatures on the physical properties, mechanical characteristics, and pore distribution were studied. Correlations between these properties were drawn. The results indicated that geopolymer foam can be synthesized using calcined kaolin with acceptable compressive strength values (2.35–11.23 MPa). The geopolymer foam had a bulk density of (0.46–1.25 g/cm3), a porosity of 45.2%–87.4%, and thermal conductivity of (0.14–0.33 W/mK). The estimated cost of the geopolymer foam developed in this investigation was 156.12 ($/m3). Compared to common thermophysical materials, the developed geopolymer foam is considered a cost-effective option for insulating construction materials.

The Influence of Peroxides and Washing Process on Metal-Organic Framework of MOF-5 Synthesized by Direct Mixing Method

In this research, the effect of hydrogen peroxide (H2O2) and benzoyl peroxide (BPO) on the structural properties, porosity, active pores, and surface area of the MOF-5 (Zn4O(BDC)3) metal-organic framework was studied. For this purpose, the metal-organic framework was synthesized by direct mixing and the molar ratios of the precursors to the ligand were modified to minimize the stoichiometric calculation error as well as the washing process to improve the properties of the synthesized MOF-5. In order to characterize the synthesized compounds and to investigate the effect of peroxides and washing process on the properties of the samples, X-ray diffraction (XRD), fourier Transform infrared spectroscopy (FTIR), and thermogravimetric/Differential scanning calorimetry (TG-DSC) analysis were performed. Structure, pore volume (1.212 cm3/g), and specific surface area (2307 m2/g) were compared to the sample synthesized with H2O2. DM-P-03 was selected as the optimal sample and prepared for thermal stability. According to TG-DSC analysis, the remaining zinc compounds in the sample were checked and the thermal stability of MOF-5 structure was confirmed up to 470°C.

Numerical analysis on influence of hydrogen peroxide (H2O2) addition on the combustion and emissions characteristics of NH3/CH4-air (O2/N2)/ H2O2 mixture

In this work, extensive chemical kinetic modeling is performed to analyze the combustion and emissions characteristics of premixed NH3/CH4–O2/N2/H2O2 mixtures at different replacement percentages of air with hydrogen peroxide (H2O2). This work is comprehensively discusses the ignition delay time, flame speed, heat release rate, and NOx & CO emissions of premixed NH3/CH4–O2/N2/H2O2 mixtures. Important intermediate crucial radicals such as OH, HO2, HCO, and HNO effect on the above-mentioned parameters is also discussed in detail. Furthermore, correlations were obtained for the laminar flame speed, NO, and CO emissions with important radicals such as OH, HO2, HCO, and HNO. The replacement of air with H2O2 increases flame speed and decreases the ignition delay time of the mixture significantly. Also, increases the CO and NOx concentration in the products. The CO and NOx emissions can be controlled by regulating the H2O2 concentration and equivalence ratios. Air replacement with H2O2 enhances the reactions rate and concentration of intermediate radicals such as O/H, HO2, and HCO in the mixture. These intermediate radicals closely govern the combustion chemistry of the NH3/CH4– O2/N2/H2O2 mixture. A linear correlation is observed between the flame speed and peak mole fraction of OH + HO2 radicals, and 2nd degree polynomial correlation is observed for the peak mole fraction of NO and CO with HNO + OH and HCO + OH radicals, respectively.

Influence of Hydrogen Peroxide on the Composition and Porosity of Oxide-Ceramic Coatings on Alloys of the Al–Si–Cu and Al–Cu–Mg Systems

Influence of Hydrogen Peroxide on the Composition and Porosity of Oxide-Ceramic Coatings on Alloys of the Al–Si–Cu and Al–Cu–Mg Systems

Influence of Hydrogen Peroxide on the Color, Opacity, and Fluorescence of Composite Resins: A Systematic Review

The clinical effectiveness of restorative materials depends on their ability to mimic the color and transparency of natural teeth. Accordingly, it is vital to understand the influence of bleaching chemicals on the color and translucency of resin composites. Bleaching chemicals may be administered to the teeth in a dental clinic under expert supervision or at home by patients. A systematic literature review from 2010 to 2022 was performed using PubMed, Medline, and ScienceDirect databases. The ke

The Influence of Peroxide on Bubble Stability and Rheological Properties of Biobased Poly(lactic acid)/Natural Rubber Blown Films

The Influence of Peroxide on Bubble Stability and Rheological Properties of Biobased Poly(lactic acid)/Natural Rubber Blown Films

Influence of Hydrogen Peroxide on Disinfection and Soil Removal during Low-Temperature Household Laundry.

In the Water, Energy and Waste Directive, the European Commission provides for the use of household washing programmes with lower temperatures (30–40 °C) and lower water consumption. However, low washing temperatures and the absence of oxidising agents in the liquid detergents, and their reduced content in powder detergents, allow biofilm formation in washing machines and the development of an unpleasant odour, while the washed laundry can become a carrier of pathogenic bacteria, posing a risk to human health. The aim of the study was to determine whether the addition of hydrogen peroxide (HP) to liquid detergents in low-temperature household washing allows disinfection of the laundry without affecting the properties of the washed textiles even after several consecutive washes. Fabrics of different colours and of different raw material compositions were repeatedly washed in a household washing machine using a liquid detergent with the addition of 3% stabilised HP solution in the main wash, prewash or rinse. The results of the antimicrobial activity, soil removal activity, colour change and tensile strength confirmed the excellent disinfection activity of the 3% HP, but only if added in the main wash. Its presence did not discolour nor affect the tensile strength of the laundry, thus maintaining its overall appearance.

Influence of hydrogen peroxide on the ROS metabolism and its relationship to pulp breakdown of fresh longan during storage

The influence of hydrogen peroxide (H2O2) on the ROS metabolism and its relationship to pulp breakdown of fresh longan cv. Fuyan during storage was evaluated. Contrasted to control fruit, H2O2-treated samples manifested a higher index of pulp breakdown, an enhanced rate of O2–. generation, and an increased amount of MDA, but lower APX, CAT and SOD activities, reduced expressions of DlAPX, DlCAT and DlSOD, and lower concentrations of total phenolics, flavonoid, AsA, and GSH as well as lower levels of free radicals scavenging capacity. These data revealed that H2O2-induced pulp breakdown of longan was because H2O2 reduced ability of removing ROS but increased ROS generation and accumulation, which promoted peroxidation of cell membrane lipid, and subsequently led to damaging cell membrane structure and breakdown occurrence in pulp of postharvest fresh longan.

Degradation of Remazol Black dye from Aqueous Solution by Heterogeneous NH3(MoO3)3/H2O2 System

Aims: The pollution of the environment by organic dyes in water is a matter of great concern. Wastewater containing dyes is difficult to treat by conventional wastewater treatment methods such as coagulation, ozonation, biological treatment, etc. This is why the implementation of an effective method by not generating pollutants secondary is necessary.
 The objective of this work is to study the degradation of remazol black, an azo dye, by the coupling of hydrogen peroxide - molybdenum oxide nanoparticle. The nanoparticles were synthesized by the aqueous sol-gel method using a reflux assembly.
 Study Design: Random design.
 Methodology: The nanoparticles were synthesized by the aqueous sol-gel method using a reflux assembly and then characterized by X-ray diffraction and using software origin to determine the particles size by Scherrer's formula. The influence of hydrogen peroxide, molybdenum oxide and hydrogen peroxide / molybdenum oxide coupling, and the degradation kinetics of remazol black were studied. We also studied the influence of the pH of the solution, the mass of molybdenum nanoparticles and the concentration of remazol black on the dye degradation process.
 Results: The results showed that the synthesized oxide is ammonium molybdenum trioxide NH3(MoO3)3) with a hexagonal structure and size 22.79 nm. The study of the catalytic effect revealed a degradation rate of 17%, 0.83% and 42% respectively for H2O2, NH3(MoO3)3 and the coupling NH3(MoO3)3/H2O2. The study also showed that the degradation of remazol black by the couple NH3(MoO3)3 /H2O2 is better at pH = 4 and for a mass of nanoparticles of 400 mg. This degradation kinetics are pseudo 1st order. In addition, the degradation rate decreases when the concentration of remazol black increases. The efficiency of the coupling (NH3(MoO3)3 / H2O2 showed at ambient temperature, that it was possible to remove about 60% of the initial color of remazol black from the water in a batch reaction.
 Conclusion: The reflux method makes it possible to synthesize molybdenum nanoparticles. The molybdenum oxide hetero-Fenton process is effective in removing remazol black dye from water.

Influence of Hydrogen Peroxide and Nanofertilizer on Rusts Development and Wheat Productivity

AN EXPERIMENT was conducted to study the effect of some foliar spray treatments on yellow rust and leaf rust severities, productivity, and grain quality of wheat cultivar “Gemmiza-7”. The treatments: hydrogen peroxide (H2O2) 30% (1mM), nano CaCO3 0.5% (5.0g/L), combination of H2O2 30% (1.0mM), and nano CaCO3 0.5% (5.0g/L), KCl (5.0g/L) and fungicide Tilt 25% EC (Propiconazole) at 25mL/100 liter- were applied with the control treatment (spraying with water). Results indicated that, all treatments had a significant effect on all the studied parameters, hence reduced rust disease infection and increased 1000 kernel weight, grain, straw, and biological yield of wheat, mineral uptake by wheat plants and total protein in grains compared with the untreated control. Spraying with the fungicide recorded the most effective treatment in reducing the yellow and leaf rusts severity in both seasons, followed by spraying with H2O2 30% which gave a disease control of (55.00 and 54.54%) for yellow rust and (74.08 and 70.57%) for leaf rust in the 1st and 2nd seasons, respectively. Spraying plants with H2O2 30% + nano CaCO3 0.5% after 70 and 100 days from sowing recorded the tallest plants and maximum values of shoot dry weight/plant, root dry weight/plant and flag leaf area. Significant increase in the concentrations of chlorophyll a, b and total chlorophyll in leaf tissues was observed. Increase in mineral contents and uptake by wheat plants without significant differences with nano CaCO3 at 0.5% and KCl at 0.5% was also recorded.

Influence of Hydrogen Peroxide on Mineralization in Dental Pulp Cells: A Systematic Review

Background: Dental bleaching agents show the ability to permeate through dental hard tissues, which may lead to pulp tissue changes. This systematic review (PROSPERO register: CRD42020213767) is aimed at understanding the effects of bleaching agents on the process of mineralization of the pulp tissue.Methods: Only in vitro studies evaluating the influence of hydrogen peroxide (HP) on mineralization in dental pulp cells were included. Studies without a non-bleached control group or cells after co-treatment with a bleaching agent other than HP and/or carbamide peroxide were excluded. The primary outcomes evaluated were alkaline phosphatase (ALP) activity and mineralized nodule deposition. The mineralization markers analysis in dental pulp cells and the cell viability were considered secondary outcomes. Two independent authors conducted a systematic search (PubMed/MEDLINE, Scopus, Embase, Cochrane Library, and OpenGrey until January 2021) with no language restrictions and performed data extraction. The quality assessment was appraised according to a modified Joanna Briggs Institute critical appraisal checklist.Results: The search resulted in 473 studies, and 11 were considered eligible. Overall, a reduction in the process of mineralization was observed among pulp cells after bleaching. A reduction in the ALP activity was reported in the mostly bleached groups using different protocols and analysis periods of nine studies. Regarding mineralized nodule deposition, 6 studies reported a significant reduction from 7 to 21 days among bleached groups. Of those three studies that investigated other mineralization markers, two found a reduction in the expression of dentin matrix acidic phosphoprotein (DMP)-1, dentin sialophosphoprotein (DSPP), and matrix extracellular phosphoglycoprotein (MEPE) among some bleaching gel concentrations. In contrast, one study showed a greater expression of osteopontin (OPN) and osteocalcin (OCN) in 100 μmol/L HP after 5 or 10 min of exposure, and another study showed significant induction of DSPP in concentrations of up to 0.5 mmol/L HP.Conclusion: Especially, high concentrations of bleaching gel reduce the potential of mineralization in pulp cells in in vitro studies; however, different HP concentrations, bleaching protocols, and analysis periods can influence this outcome.

Fluidity and strength behaviors of cemented foam backfill: effect of particle size distribution and foaming agent dosage

The influence of aggregate gradation (11 gradations with volume moment mean diameter ranging from 192 to 398 μm) and hydrogen peroxide (HP) dosage (0%, 0.8%, 1.6%, 2.4%, and 3.2% by weight of cement) on the fluidity, strength, and microstructure of cemented foam backfill (CFB) was comprehensively evaluated in this study. The fluidity, expansion ratio, and water film thickness for fresh CFB and 28-day strength and microstructural properties for hardened CFB were compared as a function of aggregate gradation and HP dosage. The end results reveal that the fluidity of fresh CFB decreases with finer aggregate and higher HP dosage due to their effect on water film thickness, but the expansion ratio increases. The strength for hardened backfill without foaming agent increases with coarser aggregate, but that for cemented foam backfill decreases. Additionally, the mercury intrusion porosimetry (MIP) results denote that the variation of aggregate gradation and HP dosage mainly influences the volume of large pores (>1 μm) and consequently the overall porosity of CFB, resulting in the strength variation. The linear relationship between compressive strength and averaged fractal dimensions of cross-sections obtained from X-ray CT indicates that the number of extra-large pores (100~500 μm) determines the strength of CFB. The influence of HP on the hydration reaction of backfill and the potential application of CFB in mining practices are also discussed.

The water stability research of the rubber powder-modified asphalt mixture

In recent years, research shows that crumb rubber modified asphalt can not only improve the pavement performance, but also reduce the pollution of waste tires. Therefore, based on the freeze-thaw test, the influence of hydrogen peroxide, rubber powder mesh number and rubber powder content on the stability of rubber modified asphalt mixture is studied. The results show that when the rubber powder content is 21% and the number of rubber powder mesh is 60, the rubber powder modified asphalt mixture has good stability, and hydrogen peroxide can improve the water stability of rubber powder modified asphalt mixture.