7 results about "Iron redox" patented technology

The invention discloses a flow battery proton exchange membrane, and particularly discloses a flow battery proton exchange membrane which is prepared by sequentially soaking a substrate material in a water phase solution and an organic phase solution, generating a skin layer film through interfacial polymerization, and then performing ultraviolet irradiation and post-treatment. 3, 3 '-diaminobiphenyl and an organic monomer are subjected to interfacial polymerization reaction on the surface of a substrate material, the proton exchange membrane with a cross-linked structure is formed through ultraviolet irradiation, and the proton exchange membrane is thin in separation layer, resistant to acid and alkali and good in chemical stability. The proton exchange membrane for the redox flow battery can be applied to an all-vanadium redox flow battery, an iron / chromium redox flow battery, a zinc / bromine redox flow battery, a sulfur / bromine redox flow battery, a sulfur / iron redox flow battery, a vanadium / bromine redox flow battery or a vanadium / iron redox flow battery.

The invention provides a medium-entropy doped sodium ion battery positive electrode material and a preparation method and application, the medium-entropy doped sodium ion battery positive electrode material comprises a matrix and a carbon coating layer on the surface of the matrix, the chemical formula of the matrix is Na4Fe3-x-y-zMnxMgyCuz (PO4) 2P2O7, 0.05 < = x < = 0.15, 0.01 < = y < = 0.05, 0.01 < = z < = 0.05, and the carbon coating layer is derived from a biomass carbon source. According to the medium-entropy-doped sodium ion battery positive electrode material, Mn, Mg and Cu with specific contents are doped, so that the iron redox reversibility can be enhanced, the charge transfer resistance can be reduced, the sodium ion diffusion coefficient can be improved, the band gap and the sodium ion migration barrier can be reduced, the lattice volume change can be reduced, and the crystal structure can be stabilized; meanwhile, by coating the carbon coating layer derived from the biomass carbon source, the conductivity of the material can be improved, and the cost is reduced.

This application relates to the field of wastewater treatment technology, and discloses a method for preparing porous ceramic-supported sulfur-based composite packing and its application in wastewater denitrification and phosphorus removal. Using porous ceramic as a carrier, a gradient filling process is employed to load active components in layers. The inner layer of siderite composite gel and calcite composite dynamically neutralizes the H+ generated by sulfur autotrophy. + pH buffering is achieved through reversible proton exchange of sulfonic acid groups; the middle-layer pyrite composite gel enhances compressive strength through C-O-Fe bonding, and the polypyrrole-coated hybrid gel constructs a π-π conjugated electron pathway, accelerating electron transfer and releasing Fe. 2+ Phosphate is precipitated; the outer layer of sulfur-biochar forms nano-sulfur crystals, rapidly initiating denitrification due to its high specific surface area. Sulfur consumption and sulfate accumulation are reduced through a sulfur-iron redox cycle. This packing material achieves highly efficient nitrogen and phosphorus removal from wastewater without the need for external carbon sources or pH adjusters.

The application discloses a sewage treatment device and method based on membrane filament oxygen supply and electrode synergistic effect of iron redox conversion, the device comprises a reactor, an electrode unit, an oxygen supply membrane unit, an iron base unit, a separation unit and a gas supply system. The oxygen supply membrane and the iron base unit are alternately arranged at a micro distance of 0.5-5 mm to form an iron-oxygen alternating interface; the electrode unit and the oxygen supply membrane unit are separated by the separation unit to form redox subareas. The application utilizes the migration and conversion of iron ions between aerobic and anaerobic zones to construct a non-contact electron transfer path, realizes simultaneous nitrification, denitrification and chemical phosphorus removal; the micro distance iron-oxygen interface can limit the initiation of efficient electro-Fenton reaction to produce hydroxyl radicals and strengthen the degradation of difficult-to-degrade organic matters such as pyrethroid. The application integrates biological denitrification, chemical phosphorus removal, advanced oxidation and biological electricity generation functions, has the advantages of high treatment efficiency, low energy consumption, stable operation and the like, and is especially suitable for treating industrial wastewater containing difficult-to-degrade organic matters.

The application belongs to the field of environmental microorganism culture and sludge resource utilization, and relates to a Desulfobulbaceae The application discloses a cable bacteria strain and application thereof, and a 16S rRNA gene sequence of the cable bacteria strain is shown as SEQ ID NO:1. The strain can couple a sulfide oxidation process and an oxygen reduction process in sludge, can adapt to a complex oxidation-reduction environment in the sludge system, can form a stable vertical oxidation-reduction gradient in the sludge system, and can couple a deep sulfide oxidation process and a surface oxygen reduction process through long-distance electron transfer. The strain can promote migration and oxidation conversion of sulfide in the sludge from a deep layer to a surface layer, and can reduce local sulfide accumulation. Meanwhile, the strain can affect spatial distribution of Fe(II) / Fe(III) in the sludge system, and can promote iron oxidation-reduction circulation and a sulfur-iron coupling process.

The invention provides an electrolyte for use in an all-iron redox flow battery, comprising an aqueous solution of an Fe2+ salt; a first cation additive being aluminium Al3+; and a second cation additive selected from the group consisting of Na+, K+, Ca²⁺, Mg²⁺ or NH4 +.

The invention discloses an alkaline total-iron flow battery negative electrode electrolyte and a preparation method thereof, and relates to the technical field of redox flow batteries, an iron ion complexing preparation alcohol amine series ligand adopted in the alkaline total-iron flow battery negative electrode electrolyte is of a multi-tooth chelation structure and contains more than two hydroxyl groups (-OH) and one amino group (-NH-), and the iron ion complexing preparation alcohol amine series ligand is of a multi-tooth chelation structure and contains more than two hydroxyl groups (-OH) and one amino group (-NH-). The complexing preparation and iron ions can form a stable complex with Fe < 3 + > / Fe < 2 + > through O-N-O multidentate sites, the complexing constant is far higher than that of a traditional organic ligand, and the cycling stability of the negative electrode electrolyte is greatly improved. The molecular size of a complex formed by the ligand and iron ions is relatively large, the permeability through an ion exchange membrane is greatly reduced, cross contamination of positive and negative electrode electrolytes is avoided, excellent electrochemical activity and stability are achieved, and the prepared high-concentration active iron electrolyte also has excellent stability.