4 results about "Fenton reagent" patented technology

The present application relates to sewage treatment technical field, especially to a kind of sewage treatment method and sewage treatment system based on upflow stirring mode high-efficiency saving reagent for effluent after biochemical treatment, utilize packing in system large circulation and carry out pollutant enrichment, improve local pollutant concentration, promote the chain reaction of advanced oxidation;Using ferrous sulfate pre-adding method improves local ferrous concentration, enhances ferrous catalytic ability, promotes reagent mixing by upflow mixing method, reduces waste reagent caused by effluent hydrogen peroxide residue, while treating the pollutant adsorbed by packing, regenerate packing, finally achieve the purpose of reducing fenton reagent dosage, suitable for treating various biochemical tail water.

This invention proposes a Fenton reagent, a polishing slurry, a polishing method for diamond substrates, and a diamond polishing sheet. The invention provides a Fenton reagent comprising a hydrogen peroxide solution and a ferrous salt-containing composition; the ferrous salt-containing composition comprises: a ferrous salt, a host molecule, and a guest molecule; the host molecule has a hydrophobic cavity structure, capable of encapsulating the guest molecule through non-covalent interactions, and exhibits chemical stability in the Fenton reaction system; the guest molecule has a conjugated π system and can coordinate with Fe. Using the Fenton reagent and abrasive particles of this invention as a polishing slurry, diamond is polished under visible light irradiation, ensuring that the Fe content in the polishing slurry is maintained. 2+ A stable concentration ensures a stable supply of hydroxyl radicals, resulting in a high-quality diamond surface.

The application discloses an inorganic shielding agent for eliminating the influence of residual flocculants in machine-made sand on the workability of concrete and an application method thereof. The inorganic shielding agent is composed of hydrogen peroxide and ferrous salt. In the mixing process of concrete or mortar, the shielding agent is added into mixing water, polycarboxylic acid water reducing agent and other raw materials, and hydroxyl radicals generated by Fenton reagent are used to rapidly degrade residual polyacrylamide (PAM) in machine-made sand by using the mixing and time provided by the mixing process, so that the competitive adsorption and tackifying effect of the residual PAM on the polycarboxylic acid water reducing agent are eliminated, and the workability of the concrete is restored. The application has the advantages of high efficiency, rapidness, low cost and simple operation, and the reaction product is harmless to the environment, and is suitable for large-scale industrial application.

Methods of detecting the presence of one or more fluorinated compounds, including perfluoroalkyl or polyfluoroalkyl substance (PFAS), in a sample are provided. The methods include the steps of chemically treating a sample with an oxidizing agent, such as a persulfate solution or Fenton's reagent, collecting the fluorinated compounds, and detecting the fluorinated compounds using analytical methods.