4 results about "Hydroxyl radical" patented technology

The invention relates to the field of photocatalysis, and particularly relates to a visible-light-driven photocatalyst for degrading dye in wastewater, and preparation and application thereof. The visible-light-driven photocatalyst for degrading dye in wastewater is characterized in that mesoporous silicon dioxide of which the framework contains Ti atoms is used as a carrier, the mesoporous silicon dioxide carrier carries graphitic carbon nitride, and bivalent Cu ions are doped on the graphitic carbon nitride, wherein the graphitic carbon nitride with the doped cupric ions serves as a main catalyst, and the element Ti serves as a cocatalyst. The Ti atoms contained in the framework of the mesoporous silicon dioxide directly react with H2O2 in a photo-Fenton-like system to produce hydroxyl free radicals, thereby obviously improving the photo-Fenton-like reaction activity. The photocatalyst provided by the invention catalyzes degradation of methyl orange and/or rhodamine B in wastewater, and degradation can be performed at room temperature under the irradiation of visible light, thereby enabling the photocatalyst to have the advantages of mild reaction conditions, low cost and easy implementation; and the photocatalyst can be easily regenerated, and still has excellent photocatalytic performance after being regenerated many times.

The invention relates to a haliotis discus hannai superoxide dismutase, and a preparation method and application thereof. The invention discloses a haliotis discus hannai superoxide dismutase gene which contains a base sequence described in SEQ ID No.1 or a gene with a code shown by protein (a) or (b) as follows: (a) protein consisting of an amino acid sequence shown in SEQ ID No.1; and (b) protein derived by (a), which is formed by replacing, losing or adding one or a plurality of amino acids in the amino acid sequence restricted by (a) and has superoxide dismutase activity. Meanwhile, the invention discloses protein encoded by the gene and a recombinant vector as well as the preparation method of the superoxide dismutase. By the preparation method, the superoxide dismutase is obtained with the help of genetic engineering technology, and the protein has very strong activities in removal of superoxide anion free radicals and hydroxyl radicals, safety, damage repair and the like, and can give play to application value in the fields such as food additives, drug preparation, cosmetics and the like.

The invention discloses a non-supported ozone catalyst and a use method thereof, and relates to the technical field of sewage treatment, the non-supported ozone catalyst comprises a non-supported ozone catalyst A and a non-supported ozone catalyst B; the volume ratio of the non-supported ozone catalyst A to the non-supported ozone catalyst B is (5: 1)-(1: 1), both the non-supported ozone catalyst A and the non-supported ozone catalyst B can catalyze ozone to generate hydroxyl radicals, the non-supported ozone catalyst A and the non-supported ozone catalyst B are placed in a non-supported ozone catalyst catalytic oxidation system, and the non-supported ozone catalyst B is placed below the non-supported ozone catalyst B; the risk that the treatment effect is reduced due to falling of active components of the catalyst does not exist, the service life of the catalyst is greatly prolonged, and the operation cost of a catalytic ozonation system is reduced.