9results about How to "Efficient oxidative degradation" patented technology

The invention discloses a construction method and application of an engineered Shewanella for degrading nicotine wastewater, and belongs to the technical field of wastewater treatment. Gene synthesis technology is used to obtain the flavoenzyme NicA2 gene, cytochrome c protein gene and arabinose-inducible promoter gene of Pseudomonas, and the three gene fragments are connected to the vector plasmid pYYDT backbone by Gibson connection technology to construct the pYYDT-NC plasmid. The pYYDT-NC plasmid is electrotransferred into Shewanella to obtain the engineered Shewanella MR-1 / pYYDT-NC, and the strain is used to treat nicotine in tobacco wastewater, showing the performance of efficient oxidation and degradation of nicotine. The strain has good adaptability in wastewater with different nicotine concentrations, and the actual application effect of degrading nicotine in tobacco wastewater is significant.

The invention relates to the technical field of sewage treatment, in particular to a water treatment method based on non-free radical oxidation. The water treatment method comprises the following steps: adding soluble carbonate into sewage containing calcium ions to obtain calcium carbonate crystals, and then introducing ozone to oxidize the sewage to obtain purified water. According to the water treatment method provided by the invention, calcium carbonate can be generated in situ in the sewage, ozone is catalyzed by the calcium carbonate to be decomposed on the surface of the sewage to generate high-activity atomic oxygen, and efficient oxidative degradation of pollutants is realized through a direct electron transfer mechanism between the atomic oxygen and organic pollutant molecules. The method breaks through the limitation of a traditional free radical path, avoids the problem of hydroxyl free radical quenching, has the advantages of high catalytic efficiency, good stability, environmental friendliness and no need of additional addition of a catalyst carrier, can realize efficient removal of calcium ions in sewage, and can be widely applied to water treatment and deep treatment of refractory organic wastewater.

The present invention provides a preparation method of a graphitized carbon catalyst and application thereof. The method uses tetranitrophenylporphyrin to organically synthesize, and then obtains a novel carbon catalyst through calcination, washing and drying. The novel carbon catalyst can be used to activate peroxymonosulfate, has 100% selectivity to release a large amount of singlet oxygen, and thus can efficiently oxidize and degrade organic dyes such as AO7 and Orange II, as well as difficult-to-degrade organic pollutants such as antibiotics. The novel carbon catalyst has excellent environmental adaptability and recycling performance, can quickly degrade most pollutants and can be reused.

The application belongs to the technical field of water treatment, and provides an electro-catalytic periodate synergistic wastewater treatment method and device. The wastewater treatment method comprises the following steps: adding organic contaminant-containing wastewater to be treated into a wastewater treatment device provided with an anode plate and a cathode plate, adding periodate into the wastewater treatment device, starting a direct current power source connected with the anode plate and the cathode plate to perform wastewater treatment, and discharging the treated wastewater; the material of the anode plate is ruthenium oxide-iridium oxide, and the material of the cathode plate is carbon felt; in the wastewater treatment process, the organic contaminant is oxidized and degraded by direct electron transfer on the anode plate, and electro-catalytic oxidation is synergized with periodate to produce active species including OH · , 1 O2,O2 ·‑ ,H2O2,IO3 · and H2O2, IO3- and H2O2, which oxidize and degrade the organic contaminant in the wastewater, and the cathode plate removes part of the contaminant in the wastewater through adsorption. The application can realize efficient and low-cost treatment of wastewater containing refractory organic matter.

The invention relates to an oxidative degradation device and method for typical PPCPs organic matter in sewage, and belongs to the technical field of sewage treatment.The device comprises a treatment tank, a filtering assembly is arranged in the treatment tank, a lighting lamp treatment assembly is arranged above the filtering assembly, and the filtering assembly and the lighting lamp treatment assembly are communicated through a water pumping assembly; the illuminating lamp processing assembly comprises a water diversion disc and an ultraviolet lamp disc, the water diversion disc is used for guiding water flow from inside to outside in the rotating process, and the ultraviolet lamp disc is used for conducting ultraviolet illuminating lamp processing on the water flow on the water diversion disc. According to the oxidative degradation device and method for the typical PPCPs organic matter in the sewage, the sewage mixed with a photo-Fenton catalyst is conveyed in the device in a circulating mode, the sewage is continuously filtered and subjected to lighting treatment in the circulating conveying process, and the effect of fully oxidizing and degrading the typical PPCPs organic matter in the sewage is achieved.

The invention discloses a ferrous silicate catalytic material as well as a preparation method and application thereof, and belongs to the technical field of catalytic materials. The preparation method comprises the following steps: slowly adding a sodium silicate solution into a ferrous sulfate solution at a constant speed, stirring and reacting under a proper pH condition, filtering, washing and drying a reaction product to obtain the ferrous silicate catalytic material, and the obtained ferrous silicate catalytic material has the characteristics of an amorphous crystal phase structure, nano-particle morphology and positive charge on the surface. The adsorbent not only has high adsorption activity on anionic organic pollutants, but also can catalyze peroxides to oxidize and degrade the organic pollutants, so that the degradation rate of the organic pollutants is improved.

The invention discloses a method for preparing an iron-based microwave catalytic material and a method for degrading sulfonamides and reducing hexavalent chromium. The method comprises the following steps: mixing iron salt, zinc salt, biochar, boric acid, and citric acid in deionized water in a certain proportion, stirring in a 60-80°C water bath, and drying the gel-like substance at 400-600°C to obtain a microwave catalyst after drying. The synthesized microwave catalyst is added to sulfonamides and hexavalent chromium-contaminated wastewater, degrading sulfonamides by oxidation reaction in a microwave field, and reducing hexavalent chromium by reduction reaction. Experiments show that the degradation rate of sulfonamides and the reduction rate of hexavalent chromium can reach 100% within 10 minutes. The microwave catalyst of the present invention can quickly and efficiently oxidize and degrade sulfonamide antibiotics and reduce hexavalent chromium without adding additional oxidants or reducing agents, and has the advantages of high efficiency, wide pH application range, environmental friendliness, and low processing cost.

This invention relates to a selenium-iron-copper composite catalyst material, its preparation method, and its applications in the field of materials chemistry. The catalyst uses ferric oxide as a matrix, with selenium powder, iron powder, and copper powder added as active components, and polyol and carboxylic acid as auxiliary agents. The process involves premixing, calcination, and pulverization. The selenium powder content is 1-7 wt% of ferric oxide, the iron powder content is 2-10 wt%, and the copper powder content is 0.5-1.5 wt%. The preferred polyol is glycerol, and the preferred carboxylic acid is crotonic acid. The calcination temperature is 400-800℃. In catalytic testing, under room temperature and air bubbling conditions, this catalyst can achieve a degradation rate of over 90% for tetracycline hydrochloride within one hour. This invention features a simple preparation method, low cost, high catalytic activity, mild operating conditions, and efficient degradation of tetracycline in water, making it suitable for antibiotic wastewater treatment.

The invention provides a manganese slag-biochar composite catalyst and a preparation method and application thereof, and the preparation method of the composite catalyst comprises the following steps: adding manganese slag and camellia oleifera shell biochar powder into a Na2CO3 solution to react for more than 30 minutes, then adding HNO3, continuing to react for more than 30 minutes, then drying at 100-130 DEG C for more than 8 hours, and continuously pyrolyzing at 450-550 DEG C for more than 3 hours. The composite catalyst prepared by the preparation method has a very good wastewater degradation effect.