8 results about "Birnessite" patented technology

The invention belongs to the field of environmental governance. The invention provides a birnessite-oxygen-releasing agent composite bottom mud repair material and preparation and application methods thereof, the birnessite-oxygen-releasing agent composite bottom mud repair material comprises a modified oxygen-releasing agent, birnessite, microbial flora and an embedding matrix, the embedding matrix comprises hydrogel formed by crosslinking calcium alginate, polyvinyl alcohol and water, the microbial flora comprises a domesticated aerobic nitrogen and phosphorus removal mixed flora. According to the birnessite-oxygen release agent composite bottom mud remediation material, the photoelectrocatalytic activity of birnessite is utilized to cooperate with the oxygen release capacity of an oxygen release compound, the oxidation-reduction potential of bottom mud is improved, the continuous degradation capacity of the material to organic pollutants is enhanced, nitrogen pollutants in a water environment are removed cooperatively, and the in-situ remediation effect of the bottom mud is enhanced; the method is applied to bottom mud remediation, is more efficient and environment-friendly, and has a long-term effect.

The application belongs to the field of environmental governance, and provides a water sodium manganese ore-oxygen releasing agent composite type sediment repair material and a preparation and application method thereof, which comprises modified oxygen releasing agent, water sodium manganese ore, microbial flora and embedding matrix, the embedding matrix comprises calcium alginate, polyvinyl alcohol and water cross-linked formed hydrogel, wherein the microbial flora comprises domesticated aerobic denitrification and phosphorus removal mixed flora.The water sodium manganese ore-oxygen releasing agent composite type sediment repair material utilizes the photoelectric catalytic activity of water sodium manganese ore and the oxygen releasing ability of oxygen releasing compound, improves the oxidation-reduction potential of sediment, enhances the sustained degradation ability of organic pollutants, cooperatively removes nitrogen pollutants in water environment, enhances the in-situ repair effect of sediment, is applied to sediment repair, and is more efficient, environment-friendly and has long-term effect.

The invention discloses a device and a method for degrading manganese and SMZ in surface water by an illumination intensified aeration fluidized birnessite and algae substance coexisting system. The device comprises a raw water tank, a membrane bioreactor, an aeration strip, an aeration pump and an effluent collecting tank, the raw water tank provides raw water for the membrane bioreactor, the membrane bioreactor comprises a tank body, a ceramic membrane, birnessite and a light source, the aeration strip is arranged in the tank body, the ceramic membrane is vertically arranged in the tank body and located above the aeration strip, the interior of the ceramic membrane is a cavity which is a purification area, birnessite is dispersedly placed in the raw water area, and the light source illuminates the tank body; bubbles generated by the aeration strip drive water flow to flow upwards, birnessite is in contact with raw water and is adsorbed and oxidized in the process, manganese and SMZ are removed in combination with lighting, the raw water enters a cavity of the ceramic membrane after being purified, and the cavity is communicated with an effluent collecting tank. The method has a good removal effect on manganese ions and SMZ, effluent can be used for distributed drinking water facilities, and the method has practical significance.

The present invention relates to composite beads coated with H-Birnessite layered manganese oxide with a sheet nanostructure, the average thickness of the sheets being between 1 and 50 nm, and the length L of the sheets being between 0.2 μm and 3 μm, as well as the manufacturing method thereof and a cell for producing said composite beads. The present invention also relates to the use of such beads in treatments for decontaminating fluids containing toxic elements such as heavy metals or organic pollutants.

The present invention discloses a manganese-based low-temperature alkali metal poisoning-resistant SCR denitrification catalyst and a preparation method thereof, comprising the following steps: adding methanol to a potassium permanganate aqueous solution to perform a reduction reaction to obtain birnessite-type MnO2; performing an acid treatment on the birnessite-type MnO2 to reduce H + The acid-treated birnessite catalyst is exchanged between the layers of birnessite; the obtained product is washed to neutrality and dried to obtain the acid-treated birnessite catalyst. + After poisoning, although the denitrification activity decreased, it still showed good denitrification activity, so the acid-treated birnessite catalyst can have good resistance to alkali metal poisoning.

The present invention discloses a method for activating PAA by complex-modified birnessite to degrade organic pollutants, which relates to the technical field of sewage treatment. First, prepare an aqueous solution of potassium permanganate and hydrochloric acid for standby; then, during the stirring and heating of the potassium permanganate solution, dropwise add the hydrochloric acid solution through a constant flow pump and continuously react to generate a suspension; then, keep the suspension at a constant temperature and stand still, followed by suction filtration, and then successively carry out water washing, alcohol washing, drying, grinding and sieving treatments to obtain birnessite powder; finally, mix it with a complexing agent solution, and obtain a complex-modified birnessite catalyst after surface complexation reaction modification. The method for activating PAA by complex-modified birnessite to degrade organic pollutants optimizes the distribution of manganese active sites on the surface of birnessite and the charge transfer path through the complexing agent. Under the condition of normal temperature without external energy input, it realizes the efficient activation of PAA, generates strongly oxidizing active free radicals, further oxidizes the organic pollutants in water, and degrades the organic pollutants.

A preparation method of a water-sodium-manganese-based high-specific-capacitance electrode active material growing around a carbon nanotube comprises the following steps: carrying out ultrasonic treatment on a carbon nanotube film in ethanol at room temperature for 30 minutes, and soaking the carbon nanotube film in deionized water to remove ethanol so as to obtain an ultrasonic-treated carbon nanotube film; in a three-electrode system, in a Mn (CH3COO) 2 solution, performing electrochemical deposition and cleaning by taking the carbon nanotube film subjected to ultrasonic treatment as a working electrode to obtain carbon nanotube film loaded manganese dioxide; in a three-electrode system, in a Na2SO4 solution, the carbon nanotube film loaded manganese dioxide is used as a working electrode, 300 times of cyclic voltammetry scanning, cleaning and vacuum drying are carried out, and a product is obtained. The process is reasonable, and the prepared carbon nanotube film loaded water sodium manganese-based capacitor material has high specific capacitance, high working potential window and good electrochemical cycle performance.

The invention discloses a method for degrading organic pollutants by complexing modified birnessite to activate PAA, and relates to the technical field of sewage treatment.The method comprises the steps that firstly, potassium permanganate and a hydrochloric acid aqueous solution are prepared for use; then in the process of stirring and heating the potassium permanganate solution, dropwise adding a hydrochloric acid solution through a constant flow pump, and continuously reacting to generate a turbid liquid; standing the turbid liquid at a constant temperature, performing suction filtration, and sequentially performing water washing, alcohol washing, drying, grinding and sieving treatment to obtain birnessite powder; and finally, mixing the modified birnessite with a complexing agent solution, and modifying through a surface complexing reaction to obtain the complexing modified birnessite catalyst. According to the method for degrading the organic pollutants by activating PAA through complexing modified birnessite, the distribution of manganese active sites on the surface of birnessite and a charge transfer path are optimized through a complexing agent, efficient activation of PAA is achieved under the normal-temperature condition without external energy input, active free radicals with strong oxidizing property are generated, the organic pollutants in water are further oxidized, and the degradation efficiency of the organic pollutants is improved. The organic pollutants are degraded.