6results about How to "Efficient mineralization" patented technology

This invention relates to the field of wastewater treatment technology, specifically to a metal-doped bismuth ferrite-based perovskite composite material, its preparation method, and its applications. The molecular formula of the metal-doped bismuth ferrite-based perovskite composite material is Bi. 1‑x A x Fe 1‑y B y O3; 0 ≤ x < 1, 0

The invention belongs to the technical field of environmental material preparation, and relates to a method for preparing a carbonized nitrogen modified CN-CPBA catalyst and application thereof in water treatment. CN is first prepared, and then 4-carboxyphenylboronic acid (CPBA) is introduced into the graphite plane of CN through a hydrothermal reaction to adjust its energy band structure and electron migration characteristics, thereby improving its photocatalytic activity. The CN-CPBA modified photocatalyst prepared by the invention has good photocatalytic activity and stability, and produces 156.4 μmol g in pure water in 1 h under simulated sunlight. ‑1 The degradation rate of tetrachlorophenol by H2O2 reached 99.8% within 60 minutes, and the kinetic k value was 11.7 times that of CN photocatalysis, while the mineralization degree was increased to 74.5%. The efficient mineralization of organic pollutants was achieved; at the same time, the catalyst also had good stability and maintained high activity after multiple cycles; the preparation process was simple and the cost was low, which was a green and efficient treatment method.

This invention discloses a copper-based metal-organic framework composite photoelectrochemical Fenton catalytic membrane, its preparation method, and its application, belonging to the field of photoelectrochemical Fenton composite catalytic membrane and water treatment technology. The catalytic membrane consists of an acidified carbon nanotube (ACCNTs) substrate and a copper-based MOF (CuBTC)@graphite-phase carbon nitride (CN) composite catalytic layer supported on its surface. First, carbon nanotubes (CNTs) are acidified with mixed acid to obtain ACCNTs, and an ACCNTs substrate membrane is prepared by vacuum filtration. Subsequently, a CuBTC@CN catalytic layer is further loaded onto the surface of the ACCNTs substrate membrane using vacuum filtration. The ACCNTs substrate enhances the electron transport rate and promotes hydrogen peroxide generation; the heterojunction formed by CuBTC and CN significantly inhibits photogenerated carrier recombination and broadens the visible light response range. The resulting copper-based metal-organic framework composite photoelectrochemical Fenton catalytic membrane can achieve simultaneous filtration and catalytic degradation in continuous flow mode, exhibiting good removal efficiency for organic wastewater.

The present application relates to a kind of preparation of nanometer SiO2 / CaSiO3 Composite material using electroplating sludge and its carbon dioxide mineralization process. Nanometer SiO2 / CaSiO3 Composite material is prepared by using carbon dioxide assisted precipitation method and solid phase mixing method, realizes the high-value resource utilization of electroplating sludge, and optimizes the carbon fixation performance of CaSiO3. The carbon dioxide mineralization process provided in the present application is under lower temperature and pressure conditions, by water vapor wetting nanometer SiO2 / CaSiO3, so that carbon dioxide is quickly mineralized into stable carbonate, thereby realizing efficient capture and storage of carbon dioxide. The process is simple in operation, low in energy consumption and uses only a small amount of water, does not cause secondary pollution, is green and environmentally friendly, low in cost, suitable for large-scale development and application.

This application discloses a supported ternary heterojunction photocatalytic material, its preparation method, and its application, relating to the field of photocatalytic materials technology. The supported ternary heterojunction photocatalytic material includes an attapulgite support; titanium dioxide and bismuth sulfide supported on the surface of the attapulgite support; and the bismuth sulfide and titanium dioxide forming a heterojunction structure on the attapulgite surface. The supported ternary heterojunction photocatalytic material proposed in this application can generate a large number of highly oxidizing active species during photocatalysis. Under visible light and neutral conditions, it can achieve efficient mineralization of recalcitrant antibiotics such as tetracycline, exhibiting a significant purification effect.

This invention discloses a bismuth-based photocatalytic material with dual acid sites, its preparation method, and its applications, belonging to the field of catalytic materials technology. This invention innovatively proposes a dual acid site synergistic activation strategy, using bismuth-based oxides as a substrate, constructing Lewis acid sites composed of low-coordinate bismuth centers and Brønsted acid sites composed of surface hydroxyl groups on its surface. This dual acid site strategy endows the material with unique substrate-oriented adsorption, electronic polarization, and proton transfer capabilities, constructing a highly efficient activation and degradation channel for perfluorinated and polyfluoroalkyl substances (PFAS), achieving efficient defluorination and complete mineralization of PFAS under mild conditions.