8 results about "Bismuth subcarbonate" patented technology

The invention relates to a preparation method and application of a monolayer assembled bismuth subcarbonate nanosheet catalyst precursor. The preparation method comprises the following steps: 1) dissolving bismuth salt in water, adding triethanolamine, and stirring and mixing to form a uniform white solution; 2) adding an alkaline substance into the solution obtained in the step 1), and adjusting the solution to be alkaline; 3) heating and reacting the solution obtained in the step 2) to obtain a suspension containing white bismuth subcarbonate nanosheets; 4) carrying out solid-liquid separation on the suspension obtained in the step 3), collecting a white solid product, washing and drying to obtain a monolayer assembled bismuth subcarbonate nanosheet precursor; the morphology is formed by orderly assembling small-size nanosheets in a single layer in the two-dimensional plane direction, stacking and gathering of the nanosheets can be effectively inhibited, and exposure and structural stability of effective active sites are remarkably improved. When applied to the field of electrochemical carbon dioxide reduction, the catalyst can continuously run for 300 hours at the current density of 100 mA. Cm <-2 >, and the average formic acid Faraday efficiency reaches 82.6%.

The application discloses a modified bismuth-based catalyst, a preparation method and application thereof, and belongs to the field of electrochemical reduction of CO2 catalysis. The application realizes in-situ synthesis of bismuth oxide and early construction of a Bi-O-C structure by hybridizing boron-doped carbon black and bismuth oxide. In particular, during the process of electrochemical reduction of carbon dioxide, the bismuth oxide is partially and spontaneously irreversibly restructured into bismuth subcarbonate (Bi2O2CO3), forming bismuth subcarbonate composite bismuth oxide (Bi2O2CO3 / Bi2O3). The existence of the structure significantly improves the application performance of the catalyst in the electrochemical reduction of carbon dioxide, and the catalyst has high formic acid selectivity, high catalytic efficiency, excellent stability and large working current capacity.

The application relates to the technical field of electrode materials, in particular to a bismuth-based alloy composite electrode material based on biomass charcoal and a preparation method thereof, which comprises the following steps: after pretreatment of waste biomass materials, KOH is used for activation and pore making, and porous biomass charcoal is obtained after acid pickling and drying; the porous biomass charcoal, basic bismuth carbonate, tin oxalate, copper oxalate and magnesium powder are mixed to obtain mixed powder, anhydrous ethanol is added to the mixed powder for grinding to a paste, and a precursor mixture is obtained after vacuum drying; the precursor mixture is subjected to a magnesium thermal reduction reaction in an argon atmosphere, the reaction product is cooled to room temperature, and acid pickling and drying are carried out to obtain the bismuth-based alloy composite electrode material based on biomass charcoal. The application solves the problems of large volume expansion and poor conductive stability of the existing bismuth-based alloy electrode, and realizes resource utilization of waste biomass.

The invention relates to a composite material of bismuthyl carbonate and a carboxyl group-containing organic compound for filtering ultraviolet radiation. The present invention relates to particles and solvates thereof, such as hydrates thereof, comprising at least one bismuth subcarbonate of the empirical formula (BiO) 2-x (CO3), where-0.4 lt; xlt; 0.6, the maximum average size of the particles being less than 400 nm; and one of at least one carboxyl group-containing organic compound and / or a salt thereof, to a process for their preparation, and also to cosmetic compositions and uses using said composite.

A composite of bismuthyl carbonate and a polymer for filtering ultraviolet radiation. The present invention relates to a composite material comprising at least one bismuthyl carbonate particle of formula (I) (BiO) 2-x (CO3) and solvates thereof (e.g. Hydrates thereof), where-0.4 lt; xlt; 0.6, the maximum average size of said particles being less than 400 nm, and at least one polymer; relates to processes for their preparation, and also to cosmetic compositions and uses of said composites.

The application relates to a corrosion-resistant coating for enhancing the corrosion resistance of a steel port terminal near the sea and a preparation method, and belongs to the technical field of corrosion-resistant coatings. The preparation method comprises the following steps: mixing bisphenol A type epoxy resin, an active diluent, a dispersing agent, a leveling agent, an anti-settling agent, alkaline bismuth carbonate, bismuth oxide and zinc phosphate to obtain component A; mixing component A with a curing agent, applying the mixture to the surface of a steel base material, and performing pre-curing to obtain a pre-cured coating; performing humidity activation treatment on the pre-cured coating to obtain a humidity-activated coating; and finally curing the humidity-activated coating to obtain the corrosion-resistant coating for enhancing the corrosion resistance of the steel port terminal near the sea. Through the specific humidity activation treatment step and the alkaline bismuth carbonate, bismuth oxide and zinc phosphate filler system, the coating has the ability to actively respond to the invasion of chloride ions, effectively blocks micro-penetration channels, and overcomes the technical difficulties that the coating performance is irreversibly attenuated and the activity of the filler is difficult to effectively stimulate.

This invention provides a flame-retardant rubber containing a bismuth-based flame retardant and its preparation method, belonging to the field of flame-retardant rubber technology. This invention uses natural rubber, nitrile rubber, styrene-butadiene rubber, and chloroprene rubber as the main base materials, while introducing at least one of bismuth oxide, bismuth oxychloride, bismuth hydroxide, and bismuth subcarbonate as an environmentally friendly flame retardant, ensuring the product's flame-retardant effect; it also reduces the use of complex solvents and potential by-product emissions, which is an important way to achieve an ideal green lifestyle. Carbon black, stearic acid, zinc oxide, decabromodiphenyl ethane, aluminum diethylphosphinate, diethyl phthalate, paraffin oil, coupling agents, insoluble sulfur, accelerators, antioxidants, and other substances are also added. Through multiple mixing and intensive kneading processes, the product's tensile properties are guaranteed while effectively improving its fire resistance, delaying ignition, reducing flame propagation speed, and enhancing the safety of product use.

This invention discloses a sulfur-iodine co-modified bismuth subcarbonate catalyst, its preparation method, and its application, belonging to the field of electrocatalytic reduction technology. The sulfur-iodine co-modified bismuth subcarbonate catalyst is a Bi₂O₂CO₃ phase, composed of Bi... 13 S 18 The I2 nanosheet precursor was reconstructed in situ into a sulfur- and iodine-modified bismuth subcarbonate nanosheet structure under near-neutral CO2 electroreduction conditions, while retaining S on its surface and / or between layers. 2‑ and I ‑ Thus retaining Bi 3+ Simultaneous oxidation of the bismuth subcarbonate catalyst enables synergistic regulation of surface anions, constructing an active interface with abundant nanoscale pits and a high specific surface area. This invention employs a simple and mild process, and the resulting sulfur-iodine co-modified bismuth subcarbonate catalyst exhibits excellent performance in the electrocatalytic reduction of carbon dioxide to formate, achieving up to 1000 mA cm⁻¹. ‑2 It maintains high formate Faraday efficiency over a wide current density range and achieves long-term stable operation in membrane electrode systems, demonstrating good prospects for practical applications.