Manganese trioxide can be used as a printing and dyeing agent for cloth
The physical and chemical properties of manganese trioxide
How to prepare manganese trioxide
The density is 4.5 g/mL, black powder, odorless. The crystal is a cubic body-centered cubic lattice, a = 0.9401nm, and the unit of the lattice is Mn32O45. γ-Mn2O3 is a black solid, and its X-ray diffraction image is similar to that of trimanganese tetroxide. When heated to 500°C under reduced pressure, it can be transformed into α-Mn2O3.
If used and stored in accordance with the specifications, it will not decompose, and there are no known dangerous reactions; it is toxic; the relative density is 4.50; it is insoluble in water, acetic acid, gradually cooling the hydrochloric acid, and gradually hot concentrated hydrochloric acid to release chlorine gas.
can be further oxidized or reduced by manganese oxide, or prepared by heating divalent manganese salt in the air at 600-800°C, but manganese sulfate is not thermally decomposed at 900°C. The easiest method is to heat manganese nitrate hexahydrate or pure β-MnO2 in air at 650°C to constant weight. When manganese nitrate hexahydrate is used as a raw material, it needs to be heated at 190°C in advance to make a solid (equivalent to β-MnO2), crush it and heat it at 650°C.
In 350 mL of a solution containing 2.2 g of manganese sulfate tetrahydrate, under vigorous stirring, 34 mL of 3% hydrogen peroxide solution was added dropwise, followed by 50 mL of 0.2mol·dm-3 ammonia water to generate γ-MnO(OH) The temperature has risen somewhat). The dark brown or black suspension that emits oxygen is quickly boiled by heating. After boiling for 4 minutes, filter and separate, wash the solid with 1.5L hot water, and put it in a vacuum desiccator containing phosphorus pentoxide at a temperature below 100°C After drying, γ-MnO(OH) is obtained. This γ-MnO(OH) is carefully dehydrated at 250°C under reduced pressure for about 3 days to produce γ-Mn2O3. In addition, γ-MnO2 can be heated at 500°C for 78 hours under reduced pressure to prepare γ-Mn2O3.
Attention should be paid to the use of manganese trioxide
Do not burn.
Hazardous characteristics: the fire field produces toxic manganese-containing smoke. Handling and storage
It is slightly harmful to water. It is forbidden to let undiluted or large amounts of products come into contact with groundwater, waterways or sewage systems. Without government permission, it is forbidden to discharge materials into the surrounding environment.
Keep the receptacle sealed and stored in a cool, dry place, and ensure that there is a good ventilation or exhaust device in the workplace.
Storage and transportation characteristics:
the warehouse is low temperature, ventilated and dry.
Fire extinguishing agent for manganese trioxide:
water, carbon dioxide, dry powder, sand.
Chemical autotrophism of bacteria caused by manganese oxidation
Manganese is one of the most abundant elements on earth. For a long time, some people have theoretically theorized the oxidation of manganese (2, 3, 4 have not been proven) to promote the growth of chemical autotrophic microorganisms. Here, we have refined an enrichment culture that exhibits an exponential growth dependent on Mn(II) oxidation to the co-cultivation of two microbial species. Oxidation requires bacteria to survive at a permissible temperature, which results in the production of small nodules of manganese oxide associated with the cell. The main members of this culture (we named them "Candidatus Manganitrophus noduliformans") belong to the phylum Nitrospira (also known as Nitrospira), but are far from the known Nitrospira and Leptospira. We isolated a small number of members, that is, a beta-Proteobacteria that does not oxidize Mn(II) alone, and named it Ramlibacter lithotrophicus (Ramlibacter lithotrophicus). Stable isotope detection shows that 13CO2 is fixed in the cell biomass, which depends on the oxidation of Mn(II). Transcriptomics analysis revealed a candidate way to combine extracellular manganese oxidation with aerobic energy conservation and autotrophic carbon dioxide fixation. These findings expand the known diversity of inorganic metabolism that supports life and complete the biogeochemical energy cycle of manganese 5,6, which may interact with other major global element cycles.
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