Showing papers on "Magnesium peroxide published in 2017"
TL;DR: In this paper, the authors characterized the equilibrium conductivity associated with intrinsic (point) defects within both compounds using first-principles calculations, and identified negative Mg vacancies and hole polarons as the dominant charge carriers.
Abstract: Nonaqueous magnesium–oxygen (or “Mg-air”) batteries are attractive next generation energy storage devices due to their high theoretical energy densities, projected low cost, and potential for rechargeability. Prior experiments identified magnesium oxide, MgO, and magnesium peroxide, MgO2, as the primary discharge products in a Mg/O2 cell. Charge transport within these nominally insulating compounds is expected to limit battery performance; nevertheless, these transport mechanisms either are incompletely understood (in MgO2) or remain a matter of debate (in MgO). The present study characterizes the equilibrium conductivity associated with intrinsic (point) defects within both compounds using first-principles calculations. For MgO, negative Mg vacancies and hole polarons—the latter localized on oxygen anions—were identified as the dominant charge carriers. However, the large formation energies associated with these carriers suggest low equilibrium concentrations. A large asymmetry in the carrier mobility is...
38 citations
15 Apr 2017
TL;DR: In this article, the authors characterized the equilibrium conductivity associated with intrinsic (point) defects within both compounds using first-principles calculations for MgO, negative Mg vacancies and hole polarons were identified as the dominant charge carriers.
Abstract: Nonaqueous magnesium–oxygen (or “Mg-air”) batteries are attractive next generation energy storage devices due to their high theoretical energy densities, projected low cost, and potential for rechargeability Prior experiments identified magnesium oxide, MgO, and magnesium peroxide, MgO2, as the primary discharge products in a Mg/O2 cell Charge transport within these nominally insulating compounds is expected to limit battery performance; nevertheless, these transport mechanisms either are incompletely understood (in MgO2) or remain a matter of debate (in MgO) The present study characterizes the equilibrium conductivity associated with intrinsic (point) defects within both compounds using first-principles calculations For MgO, negative Mg vacancies and hole polarons—the latter localized on oxygen anions—were identified as the dominant charge carriers However, the large formation energies associated with these carriers suggest low equilibrium concentrations A large asymmetry in the carrier mobility is
29 citations
TL;DR: In this paper, a mixture of oxygen releasing compounds (ORCs) was designed in an attempt to continuously supply dissolved oxygen (DO) in the oxygen-limiting conditions and evaluate bacterially induced calcium carbonate (CaCO3) production.
Abstract: In the present study, a mixture of oxygen releasing compounds (ORCs) was designed in an attempt to continuously supply dissolved oxygen (DO) in the oxygen-limiting conditions and evaluate bacterially induced calcium carbonate (CaCO3) production. The biomineralization of CaCO3 was adversely affected in the presence of calcium peroxide (CP) and zinc peroxide (ZP), whereas urea-hydrogen peroxide (UP) and magnesium peroxide (MP) were found to be significant on enhancing the biosynthesis of CaCO3. The optimal values for UP and MP obtained from central composite face-centered (CCF) were 1800 mg/L and 8.3 mg/L, respectively. As compared to the control samples, the bacterially induced CaCO3 precipitation was not only enhanced but also accelerated when the optimum concentrations of ORCs were supplemented in the fermentation media. Moreover, the morphology of the precipitated CaCO3 was affected in the presence of ZP, while no such effect was observed when the media were supplemented with CP, UP or MP. The results of this study can be used in many natural and engineered applications such as the constructional purposes for designing a more efficient bio self-healing concrete. The other applications of this innovative technology are the removal of heavy metals, radionuclides and calcium ions contaminants from the environment.
23 citations
TL;DR: In this article, an antibacterial agent (MgO2) was synthesised using 0.2 and 0.4 M concentrations of MgCl2·6H2O and H2O2, which was subsequently applied to cotton fabric using a conventional pad-dry-cure method in order to achieve antibacterial properties against S. aureus and E. coli microorganisms.
Abstract: An antibacterial agent (MgO2) was synthesised using 0.2 and 0.4 M concentrations of MgCl2·6H2O and H2O2, which was subsequently applied to cotton fabric using a conventional pad-dry-cure method in order to achieve antibacterial properties against S. aureus and E. Coli microorganisms. The antibacterial effect against these microorganisms was investigated using a zone of inhibition test and the percent reduction method. The outcomes of these measurements showed that when the cotton fabric was treated with the reaction product of MgCl2·6H2O and H2O2, it retained 90–93% antibacterial activity against S. aureus and 89–91% against E. coli bacteria. This antibacterial effect against these microorganisms was attributed to the presence of reactive oxygen species and Mg ions on the treated cotton fabric. Long term antibacterial effects against S. aureus and E. coli microorganisms were recorded for up to 70 laundering cycles, and the amounts of retained bound peroxide and Mg ions on the finished specimens were measured using iodimetric titration and MP-AES measurements. Additionally, the properties of synthesised MgO2 crystalline powder and treated cotton fabric were studied using UV–Vis, EDX, FTIR spectroscopy, and SEM measurements. The influence of the MgO2 application on mechanical properties such as tensile strength, tear strength, whiteness index, and crease recovery angle of the treated cotton fabric was also analysed. The results obtained clearly confirmed that the treated cotton fabric possessed antibacterial effects for up to 70 laundering cycles. This is likely due to the presence of the required amount of oxidative species and Mg ions on the treated cotton fabrics. The FTIR and EDX results showed that the presence of these key elements (oxygen containing groups) was responsible for the antibacterial property of the finished fabrics. The whiteness index and tensile strength were improved after treatment with MgO2, although tear strength and flexibility of treated specimens were decreased after treatment.
23 citations
Patent•
15 Sep 2017
TL;DR: In this article, an urban sewage rapid purifying agent is composed of 0.1-25 parts of boron-iron-aluminum polysilicates, 2-10 parts of calcium peroxide, 1-10 part of magnesium peroxide and 1-15 part of aluminum ferric polysilicate.
Abstract: The invention belongs to the technical field of water environment treatment and relates to a sewage purifying agent. An urban sewage rapid purifying agent is composed of 0.1-25 parts of boron-iron-aluminum polysilicate, 2-10 parts of calcium peroxide, 1-10 parts of magnesium peroxide, 1-15 parts of aluminum ferric polysilicate, 1-10 parts of polyacrylamide, 1-10 parts of ployferric sulfate, 1-15 parts of calcium nitrate, 1-3 parts of sodium silicate and 1-2 parts of polyferric chloride. The agent provided by the invention has the advantages that pH after hydration can be controlled to be 7.5-9.5, and tight composite mineralized sediments which are provided with sustained release oxygen and are mainly calcium silicate, magnesium silicate, aluminum silicate, calcium aluminosilicate and aluminosilicic acid can be gradually formed. Therefore, suspending particular matters and various kinds of harmful impurities in sewage can be rapidly settled, sustained release and oxygenation functions on mud at the water bottom can be realized, bottom mud with a tight structure also can be formed after settlement, and the sewage purifying agent can be applied to treatment of printing and dyeing wastewater, urban polluted landscape water and urban inland river black and odorous water.
3 citations
Patent•
24 May 2017
TL;DR: In this article, a soil conditioner for preventing soil hardening is described, which is prepared from the following raw materials: rice husks, wheat hulls, banana fiber, cocoanut fiber, barks, turf, leguminous plant straws, bean cakes, vinasse, coffee residues, rape seed cakes, cottonseed cakes, fish meal, bone meal, medical stone powder, zeolite powder, bentonite, urea, ammonium sulfate, unea, uric acid, uonic acid, zinc sulfate and potassium chloride.
Abstract: The invention discloses a soil conditioner for preventing soil hardening. The soil conditioner is prepared from the following raw materials: rice husks, wheat hulls, banana fiber, cocoanut fiber, barks, turf, leguminous plant straws, bean cakes, vinasse, coffee residues, rape seed cakes, cottonseed cakes, fish meal, bone meal, medical stone powder, zeolite powder, bentonite, urea, ammonium sulfate, monopotassium phosphate, ferrous sulfate, magnesium sulfate, zinc sulfate, potassium chloride, calcium superphosphate, calcium peroxide, magnesium peroxide, borax, an agricultural water-retaining agent and a microbial agent. The invention further provides a preparation method of the soil conditioner for preventing soil hardening. The soil conditioner disclosed by the invention is low in raw material cost and scientific in component, and can well adjust the soil structure and prevent the soil hardening.
3 citations
01 Nov 2017
TL;DR: In this article, the authors explored metal peroxides and its composites for dye degradation by photochemical pathways and reported that the synthesized composites have been characterized by IR, DRS and powder XRD.
Abstract: Semiconductor metal oxides/its composites with polymers have been explored for dye degradation through photocatalytic mechanism; these require UV or visible light for activation. Hence, there is need to develop (photo) catalyst that work in absence/presence of light. Towards this objective we are exploring metal peroxides and its composites for dye degradation. Here, we report our work on magnesium peroxide and its composites for dye degradation by photochemical pathways. The nanocomposites are synthesized from monomers and peroxides. The synthesized composites have been characterized by IR, DRS and powder XRD. The composites did not degrade dyes in dark.
3 citations
Patent•
19 Apr 2017
TL;DR: In this paper, a natural degradation cultivation pot consisting of cassava starch, polyvinyl alcohol, pineapple fiber, chitosan fiber, coconut carbon fiber, ricinoleate plasticizer, borax cross-linking agents, radix astragali, rhizoma atractylodis macrocephalae, angelica sinensis, phoenix tree branches and leaves, bitter chrysanthemum, melia azedarach branch calcium peroxide, magnesium peroxide and calcite powder, medical stone powder, tourmaline stone powder
Abstract: The invention discloses a natural degradation cultivation pot. The natural degradation cultivation pot comprises cassava starch, polyvinyl alcohol, pineapple fiber, chitosan fiber, coconut carbon fiber, ricinoleate plasticizer, borax cross-linking agents, radix astragali, rhizoma atractylodis macrocephalae, angelica sinensis, phoenix tree branches and leaves, bitter chrysanthemum, melia azedarach branch calcium peroxide, magnesium peroxide, calcite powder, medical stone powder, tourmaline stone powder, far infrared ceramic powder, negative ion powder and aerogel powder. The invention further discloses a preparation method of the natural degradation cultivation pot. The degradability of the cultivation pot is effectively improved through the characteristic of combination of starch and animal and plant fiber and different characteristics of all the raw materials.
2 citations
Patent•
13 Oct 2017
TL;DR: In this article, a preparation method and an application method of a magnesium peroxide antibacterial agent is described. The method comprises the following steps: adding magnesium chloride hexahydrate into a hydrogen peroxide solution, stirring until magnesium chloride is completely dissolved, and adding a NaOH solution dropwise while stirring until synthesis of insoluble magnesium peroxides is completed; filtering the generated generated magnesium peroxy by filter paper, and using clear water to wash impurities adsorbed on the magnesiumperoxide product.
Abstract: The invention discloses a preparation method and an application method of a magnesium peroxide antibacterial agent The method comprises the following steps: adding magnesium chloride hexahydrate into a hydrogen peroxide solution, stirring until magnesium chloride is completely dissolved, and adding a NaOH solution dropwise while stirring until synthesis of insoluble magnesium peroxide is completed; filtering the generated magnesium peroxide by filter paper, and using clear water to wash impurities adsorbed on the magnesium peroxide product; transferring the cleaned magnesium peroxide from the filter paper to a glass surface vessel and drying to finish preparation of the magnesium peroxide; grinding the synthesized magnesium peroxide antibacterial agent into powder, mixing the powder and acrylamide in an aqueous solution uniformly, and preparing finishing liquid under ultrasonic treatment; soaking fibers in the finishing liquid, performing roll compacting on a padder, drying for a certain time and performing high-temperature solidification to finish cross linking; and washing the finished fiber with water The preparation method and the application method of the magnesium peroxide antibacterial agent have the beneficial effects of high antibacterial property and no influence on the original wearability of textiles
1 citations
Patent•
07 Nov 2017
TL;DR: In this paper, a carbon/magnesium aluminum spinel composite powder was proposed to solve the problem that carbon in carbon-containing refractory materials is difficult to disperse uniformly and easy to agglomerate.
Abstract: The invention discloses carbon/magnesium aluminum spinel composite powder. The composite powder comprises the following raw materials in percentage by mass: 28.6%-40.8% of magnesium oxalate, 20.6%-28.6% of magnesium peroxide, 19.0%-22.2% of alumina and 19.8%-23.8% of aluminum powder, and the sum of the mass percentages of the raw materials is 100%. Preferably, the composite powder comprises the following raw materials in percentage by mass: 33.4% of magnesium oxalate, 22.2% of magnesium peroxide, 22.2% of alumina and 22.2% of aluminum powder. The composite powder solves the problem that carbon in carbon-containing refractory materials is difficult to disperse uniformly and easy to agglomerate, and the prepared composite powder has fine grains and can be better applied in the field of refractory materials.
1 citations
Patent•
21 Dec 2017
TL;DR: In this paper, an oxygen sustained-release agent including magnesium peroxide and an organic acid salt is proposed to avoid eutrophication derived from phosphorous high in an environmental load, capable of evading the increase only of phosphorous in a plant medium.
Abstract: PROBLEM TO BE SOLVED: To provide an oxygen sustained-release agent capable of maintaining oxygen sustained-release performance over a long period, even if being eluted into water of river, harbor or the like, not causing eutrophication derived from phosphorous high in an environmental load, capable of evading the increase only of phosphorous in a plant medium, and also capable of simplifying a stage of adding the soil or the like.SOLUTION: Provided is an oxygen sustained-release agent including magnesium peroxide and an organic acid salt.SELECTED DRAWING: Figure 1
Patent•
04 Jan 2017
TL;DR: The cellulose additive is used for producing the artificial leather, the raw materials have a synergistic effect, the performances of the artificial leather can be improved, a real leather effect can be achieved substantially, and compared with real leather surface, the surface is easier to clean as discussed by the authors.
Abstract: The invention provides a cellulose additive for producing artificial leather. The cellulose additive is prepared from, by weight parts, 7 parts of nitrocellulose, 3 parts of methyl cellulose, 0.3 part of magnesium peroxide, 0.6 part of chlorinated polyethylene, 0.5 part of sepiolite, 0.15 part of zinc stearate, 0.11 part of paraffin, 0.24 part of dimethoxydimethylsilane, 0.17 part of nano silica and 0.2 part of diethyl phthalate. The cellulose additive is reasonable in raw material ratio, and the raw materials are cheap and easy to obtain; through effects of liquid paraffin and diethyl phthalate, slits in cellulose are fully reduced to be minimum, and the plasticity of the cellulose is improved. The cellulose additive is used for producing the artificial leather, the raw materials have a synergistic effect, the performances of the artificial leather can be improved, a real leather effect can be achieved substantially, and compared with real leather, the surface is easier to clean.
Patent•
01 Jun 2017TL;DR: In this paper, a nonaqueous type magnesium oxygen battery including a negative electrode, a positive electrode, and a non-aqueous magnesium ion conductor is described, where the negative electrode is configured to absorb magnesium and release magnesium ion.
Abstract: A non-aqueous type magnesium oxygen battery including a negative electrode, a positive electrode, a non-aqueous magnesium ion conductor, and a promoter is described. The negative electrode is configured to absorb magnesium and release magnesium ion. The positive electrode is configured to produce a discharge product that includes magnesium and oxygen during a discharge process of the battery. The non-aqueous magnesium on conductor is between the negative electrode and the positive electrode. The promoter is included with the positive electrode. The promoter is configured to promote MgO2 (magnesium peroxide) production during the discharge process of the battery.
Patent•
22 Dec 2017
TL;DR: In this article, a fertilizer formulation consisting of granules comprising at least one fertilizing substance and a mixture comprising a polymer (P) and inorganic peroxide, is presented, where the polymer is a polypropylene glycol, a polyethylene glycol or a derivative thereof.
Abstract: The present invention relates to a fertilizer formulation comprising granules comprising at least one fertilizing substance and a mixture comprising a polymer (P) and at least one inorganic peroxide, to a process for the preparation of said formulation and to the uses thereof. In an embodiment, the polymer is a polypropylene glycol, a polyethylene glycol, or a derivative thereof. The inorganic peroxide is at least one among calcium peroxide, magnesium peroxide, barium peroxide, sodium peroxide, lithium peroxide, and potassium peroxide, preferably calcium peroxide.
Patent•
08 Jun 2017
TL;DR: In this article, a non-aqueous type magnesium oxygen battery with high output power and high energy density was proposed. But, the battery was not designed to produce a discharge product that contained magnesium and oxygen during a discharge process of the battery.
Abstract: PROBLEM TO BE SOLVED: To provide a non-aqueous type magnesium oxygen battery with high output power and high energy density.SOLUTION: A non-aqueous type magnesium oxygen battery includes a negative electrode, a positive electrode, a non-aqueous magnesium ion conductor, and a promoter. The negative electrode is configured to adsorb magnesium and release magnesium ions. The positive electrode is configured to produce a discharge product that contains magnesium and oxygen during a discharge process of the battery. The non-aqueous magnesium ion conductor is arranged between the negative electrode and the positive electrode. The promoter is included in the positive electrode. The promoter is configured to promote MgO(magnesium peroxide) production during the discharge process of the battery.SELECTED DRAWING: Figure 1
Patent•
15 Feb 2017
TL;DR: In this article, a dripping pill treatment technique for improving the stability of a drippingpill for a cigarette is described, where the dripping pill is soaked for 2min to 60min in an aqueous solution of peroxide, and then is taken out and put into clear water; the residue of a solvent on the surface of the drippingpill is cleaned ultrasonically.
Abstract: The invention provides a dripping pill treatment technique for improving the stability of a dripping pill for a cigarette. According to the dripping pill treatment technique for improving the stability of the dripping pill for the cigarette, the dripping pill is soaked for 2min to 60min in an aqueous solution of peroxide, and then is taken out and put into clear water; the residue of a solvent on the surface of the dripping pill is cleaned ultrasonically; the frequency of an ultrasonic cleaning machine is 20KHz to 40KHz; the cleaning time is 2min to 60min. The peroxide is one or several of hydrogen peroxide, sodium peroxide, potassium peroxide, calcium peroxide, magnesium peroxide, zinc peroxide, potassium hydrogen persulfate, strontium peroxide, ammonium persulfate, potassium persulfate and sodium percarbonate. The dripping pill obtained by adopting the technique provided by the invention has great improvements in the aspects of hardness, brittleness and environmental suitability; the appearance and the physical performance quality of a product are obviously raised. Through a subsequent cleaning technique, an oxidation polymerization reaction can be terminated in time; the quality of a rubber sheet of the dripping pill is enabled to be more stable.