13 results about "Periodate" patented technology

The invention relates to a 1D / 2D dual-heterojunction catalyst, a preparation method thereof and application of the 1D / 2D dual-heterojunction catalyst in photo-assisted periodate activated degradation of bisphenol A. The preparation method comprises the following steps: mixing a concentrated hydrochloric acid solution with LiF, adding Ti3AlC2, carrying out a heating reaction, carrying out solid-liquid separation to obtain a solid phase, washing the solid phase to be neutral, and dispersing the solid phase in ethanol to obtain an MXene ethanol solution; adding a cerium source aqueous solution into an MXene ethanol solution, mixing, and placing in liquid nitrogen to obtain a mixed solution; mixing an organic ligand, ethanol and pure water to obtain a mixed solution, carrying out a mixed heating reaction on the mixed solution and the mixed solution, carrying out solid-liquid separation to obtain a precipitate, and freeze-drying to obtain powder; and heating and calcining the obtained powder in an inert atmosphere to obtain the 1D / 2D dual-heterojunction catalyst. According to the invention, photogenerated electron-hole recombination is effectively inhibited by constructing double heterojunctions, and ultrafast electron transfer is realized at the same time, so that the oxidation effect is enhanced, and the efficient photocatalytic activity of '1 + 1gt, 2' is realized.

The present application relates to a kind of trace nitrogen oxide reinforced UVB / high iodate degradation flame retardant intermediate method, comprising the following steps: respectively, an appropriate amount of high iodate and ACNHTEMPO are sequentially added into DOPO containing wastewater, the pH of mixed solution is adjusted with phosphate buffer solution, after being fully stirred, UV irradiation is carried out for a period of time, the degradation of organic phosphorus flame retardant intermediate DOPO can be realized.The present application method utilizes potassium periodate under the irradiation of ultraviolet light, activates ACNHTEMPO to speed up electron transfer rate, substantially improves the degradation efficiency of pollutant, and the pH is widely applicable.Solve the defect that most advanced oxidation technology needs to be carried out in acidic conditions;In addition, the present method is simple to operate, uses trace activator, does not produce secondary pollution, can provide new perspective for organic wastewater treatment field.

The application discloses a method for degrading paracetamol in water by using carbon-doped boron nitride to activate periodic acid, which is characterized by using carbon-doped boron nitride to activate periodic acid to degrade water containing paracetamol; the carbon-doped boron nitride catalyst is prepared by coating boron nitride with polydopamine and calcining, wherein the calcining temperature is 700-1000 DEG C. The method can efficiently activate a low-dose periodic acid oxidant by using the carbon-doped boron nitride catalyst, thereby efficiently degrading paracetamol, and has the advantages of simple process, convenient operation, high oxidant utilization rate, fast degradation efficiency, good removal effect and the like, and is a green and environment-friendly method, which has practical significance for wastewater treatment in the environment.

The invention belongs to the technical field of iodine removal of light salt brine, and particularly relates to a method for removing high-valence iodine in ionic membrane caustic soda light salt brine. Comprising the following steps: (1) adding a pH regulator and sodium sulfite into light salt brine, regulating the pH to 1-3, stirring until the reaction is completed, and carrying out primary adsorption deiodination by adopting a composite adsorbent to obtain light salt brine 1; and (2) adding a pH regulator and hydrogen peroxide into the light salt brine 1, regulating the pH value to 1-2, stirring until the reaction is completed, and carrying out secondary adsorption by adopting a composite adsorbent to remove iodine, thereby obtaining the deiodinated light salt brine. According to the removal method disclosed by the invention, high-valence iodine such as periodate and iodate in the light salt brine is converted into low-valence iodine such as iodate and iodide ions by utilizing the reducibility of sodium sulfite and the oxidation-reduction property of hydrogen peroxide in the coexistence of iodide ions and iodate, and then is further converted into simple substance iodine, and the simple substance iodine is efficiently removed by utilizing a composite adsorbent; the process is simple, the cost is low, the removal rate is high, and the removal effect is good.

The invention provides a method for removing trace iodine in light salt brine produced by using an ionic membrane, which comprises the following steps: adding a pH regulator and a ferrous reducing agent into the light salt brine, regulating the pH value of the light salt brine to 1-4.5, adding an excessive amount of the ferrous reducing agent, and stirring until the reaction is completed; and adsorbing and removing iodine in the light salt brine after the reaction is completed by adopting a composite adsorbent to obtain the light salt brine after the iodine removal. According to the removal method, iodide, iodate and periodate in the light salt brine are converted into elemental iodine to be removed by utilizing the reducibility of Fe < 2 + > and the oxidizability of the product Fe < 3 + >, the problem of over-reduction or over-oxidation does not exist, the process is simple, the cost is low, the removal rate is high, and the removal effect is good.

This invention belongs to the field of wastewater treatment technology, specifically relating to a method for degrading phthalic acid ester pollutants using photo-activated periodate. The method involves adding periodate to the reaction system and applying light irradiation. Under light, periodate continuously generates various free radicals, which can attack phthalic acid esters, achieving efficient degradation. Compared with existing advanced oxidation technologies, this invention does not require high-energy ultraviolet light sources or additional catalysts. The reaction conditions are mild, energy consumption is low, and the process is simple. It is suitable for the removal of phthalic acid ester pollutants from industrial wastewater, domestic sewage, and surface water, and has promising engineering application prospects.

The invention discloses a ferrate composite coagulant and a preparation method thereof, and the ferrate composite coagulant comprises the following components in percentage by mass: 5%-70% of ferrate, 5%-30% of ferric trichloride, 2%-20% of periodate, 5%-40% of beta-cyclodextrin and 1%-10% of alkaline auxiliary materials. The preparation method comprises the following steps: adding beta-cyclodextrin into a KOH solution, heating, adding ferrate, and carrying out primary inclusion to obtain an intermediate product; adding ferric trichloride, periodate and auxiliary materials into the intermediate product, and then adding into a heated saturated aqueous solution of beta-cyclodextrin for secondary inclusion. Periodate is adopted as a stabilizer, so that the ion concentration of decomposition reaction products such as K < + > can be increased, the decomposition reaction of ferrate is inhibited, and the stability of the solution is improved. The composite coagulant can be stably stored at normal temperature, is slowly and stably released in an aqueous solution, can keep high strength for a long time, and has good flocculation performance in water treatment.

This invention discloses a method for removing oxytetracycline from water using boron nitride-modified copper ferrite-activated periodate. The catalytic material uses copper ferrite as the main material and boron nitride as a modifying material, wherein the mass ratio of boron nitride to copper ferrite is 1:5–20. The catalytic material used in this invention promotes charge transfer through surface support and the formation of interfacial Fe-N bonds, thereby achieving excellent oxytetracycline removal performance. The method for removing oxytetracycline from water using boron nitride-modified copper ferrite-activated periodate described in this invention has advantages such as low cost, simple operation, stable catalytic performance, wide applicable pH range, strong anti-interference ability, and high oxytetracycline removal efficiency, and has a promising application prospect for oxytetracycline wastewater treatment.

The application provides a ruthenium-poly-2,6-diaminopyridine (Ru-PDAP) catalytic material and a preparation method and application thereof, and belongs to the technical field of water treatment. The Ru-PDAP catalytic material provided by the application comprises porous poly-2,6-diaminopyridine (PDAP) and ruthenium nanoparticles (Ru) loaded on the surface and internal pores of the PDAP. The Ru-PDAP catalytic material provided by the application has a good cavity structure, the PDAP serves as an electron donor to provide an activation site for a periodate, and the mutual conversion of various valence states (0, 2+, 3+, 4+, 6+, 8+) of the Ru can provide more electrons for the oxidation and degradation of organic matters by the periodate, and has a good catalytic effect on the degradation of antibiotics by the periodate / hydrogen peroxide.

The present invention relates to a method for preparing a metal para-periodate by anodic oxidation of an iodine compound with an oxidation state from −I to +V in an electrolysis cell under specific conditions, and to a device for carrying out this reaction.

This invention discloses an orbital-controlled α-MnO2@CNT hybrid and its selective generation of IO3 upon activation of periodate (PI). • Applications in [the field]. This hybrid material uses α-MnO2 nanoribbons as the active component and CNTs as the electron reservoir, and is prepared via a one-step co-precipitation method. The CNTs and α-MnO2 form an interfacial hybrid structure, which can modulate the electronic state density of the Mn 3d orbitals, shifting the Mn d-band center upwards and enhancing PI adsorption and interfacial electron transfer efficiency. When this hybrid material is added as a catalyst to water containing PI and mixed pollutants, it can selectively generate IO3-. • Main, 1 O2 is a secondary active species, enabling the simultaneous and efficient degradation of mixed pollutants, including sulfonamide antibiotics and Rhodamine B. This invention features a simple and low-cost preparation process, a catalyst with good stability and strong anti-interference ability, wide applicability, and no formation of toxic iodides, providing a new technical solution and theoretical support for the remediation of complex water bodies.

The invention discloses a method for degrading organic pollutants by activating periodate through surface engineering modified hematite. The catalytic material is prepared by calcining manganese-doped iron oxyhydroxide serving as a precursor in an ammonia atmosphere generated by urea pyrolysis, the molar ratio of manganese to iron is 1: 9, and the mass ratio of the manganese-doped iron oxyhydroxide precursor to urea is 1: (1-7). According to the catalytic material, adsorption and charge transfer of periodate are promoted by constructing asymmetric oxygen vacancies and Fe-interstitial N double active sites, so that efficient degradation of organic pollutants is realized. The method disclosed by the invention has the advantages of low cost, simplicity and convenience in operation, environmental friendliness, stable catalytic performance, high organic matter removal efficiency, great practical application potential and the like, and has a wide application prospect in the field of organic wastewater treatment.

The invention provides a method for purifying iodide ions in refined salt water in an ionic membrane chlor-alkali production process. The purification method comprises the following steps: S1, dissolving industrial salt in water to obtain crude brine; s2, adding sodium carbonate and sodium hydroxide into the crude brine, adding ferric trichloride, stirring, standing, and filtering to obtain primary brine; s3, sodium sulfite is added into the primary saline water for reduction, then a hydrochloric acid solution is added, finally, the primary saline water is introduced into ion exchange resin for adsorption, and the ion exchange resin comprises D541 cationic resin and anion resin. According to the invention, the anion resin is added on the basis of the original D541 cation resin, so that iodide ions in the saline water can be effectively reduced, even the iodide ions in the saline water can be reduced to 0.1 mg / L or below, and furthermore, periodate can be effectively prevented from being generated and the service life of an ionic membrane can be prolonged in the electrolysis process of an electrolytic bath; the problem of salt resource waste caused by replacement of salt seeds or discharge of part of salt in a traditional method is effectively solved.