6results about How to "Avoid passivation" patented technology

This invention relates to a modified zero-valent iron / biochar composite material with oxygen-rich vacancies and its application. The modified zero-valent iron / biochar composite material comprises a biochar carrier and zero-valent iron loaded on the biochar carrier. The surface of the zero-valent iron is coated with sulfur-containing iron compounds and / or boron-containing iron compounds, and the surface of the zero-valent iron contains abundant oxygen vacancies. The modified zero-valent iron / biochar composite material is specifically prepared by the following method: dispersing the biochar carrier and zero-valent iron in oxygen-free water and grinding; adding a sulfur source or boron source to the ground suspension, stirring and grinding thoroughly, and drying; subsequently soaking in a reducing solution, followed by high-temperature calcination and cooling to obtain the modified zero-valent iron / biochar composite material. Compared with the prior art, the modified zero-valent iron / biochar composite material prepared by this invention can be used synergistically with compound oxidants to achieve effective remediation of organically contaminated soil.

This application provides a highly sensitive and interference-resistant microsensor for ethylene monitoring, comprising a housing and a working electrode, a reference electrode, and a protective electrode disposed within the housing. One end of the housing is a detection tip, and the other end is a mounting end. The detection tip is sealed and filled with a breathable membrane layer. The housing is filled with a composite ionic electrolyte. The detection end of the working electrode is coated with a Pd-based doped composite nanolayer, which is applied to the detection end of a platinum wire substrate using a sputtering process. This application, through improvements to the electrode material, nanocoating process, and electrolyte system, effectively enhances the detection accuracy of the microsensor for ethylene detection, achieving nano-molar level accuracy, while also improving its interference resistance, coating stability, and service life.

The application discloses a ball-milling mixed iron powder and a preparation method and application thereof. The mixed iron powder is prepared from iron powder, a solid oxidizing agent and a phenolic compound as raw materials. In a ball-milling condition, different valence iron species are generated in situ through a pre-oxidation effect of the solid oxidizing agent, self-depassivation is realized, and the passivation phenomenon generated by zero-valent iron in water is overcome. The mixed iron powder has high reactivity and can be used for wastewater treatment containing oxidizing components.

This invention discloses a rapid cold-start water electrolysis hydrogen production system, belonging to the field of water electrolysis hydrogen production technology. The system includes an electrolyzer, a hydrogen-side gas-liquid separator, an oxygen-side gas-liquid separator, and a heat exchanger. The electrolyzer is connected to the inlet of the hydrogen-side gas-liquid separator via a first gas-liquid delivery pipeline, and to the inlet of the oxygen-side gas-liquid separator via a second gas-liquid delivery pipeline. The outlet of the hydrogen-side gas-liquid separator is connected to a first circulation branch, and the outlet of the oxygen-side gas-liquid separator is connected to a second circulation branch. Both the first and second circulation branches are connected to the first inlet of the heat exchanger via a first main circulation pipeline. The first outlet of the heat exchanger is connected to the electrolyzer via a second main circulation pipeline. This invention can significantly reduce the cold-start voltage, prevent electrode passivation in the electrolyzer, improve electrolysis efficiency, and reduce hydrogen production energy consumption.

This invention relates to the field of solid waste treatment technology, specifically to a device for the harmless treatment of wastewater from solid waste: It includes a pretreatment unit, an electrochemical synergistic reaction tank, and a deep filtration assembly connected in sequence. In the first reaction zone, an anode plate is used to mineralize highly stable organic pollutants, while simultaneously altering the form of dissolved heavy metal ions through electrodeposition or valence state conversion. Next, a first ultrasonic transducer prevents electrode passivation and promotes the migration of pollutants to the electrode surface. Subsequently, the wastewater after electrochemical conversion enters the second reaction zone, where a magnetic adsorption packing layer efficiently adsorbs and immobilizes the converted heavy metal ions and organic intermediates in situ. Simultaneously, a second ultrasonic transducer group prevents the adsorption medium from agglomerating and enhances adsorption kinetics. Using this structure, efficient removal of dissolved heavy metal ions and highly stable organic pollutants is achieved, resulting in better treatment of wastewater from solid waste.