356 results about "Iron oxyhydroxide" patented technology

First, a ferrous iron-containing suspension solution is obtained by mixing an aqueous ferrous salt solution and an aqueous alkali solution containing one or two of an alkali carbonate and an alkali hydroxide. Then, an iron oxyhydroxide particle precursor is obtained by blowing an oxygen-containing gas having an oxygen component proportion of 0.5 to 0.8 into the suspension solution thus obtained to oxidize the ferrous iron in the suspension solution at an oxidation rate of 30 to 65% while the suspension solution is being controlled to fall in a temperature range of -5 DEG C. or higher and lower than 10 DEG C. Thereafter, the iron oxyhydroxide particles 2 are produced from the iron oxyhydroxide particle precursor by blowing an oxygen-containing gas into the suspension solution containing the iron oxyhydroxide particle precursor while the suspension solution is being controlled to fall in a temperature range of 20 DEG C. or higher and lower than 45 DEG C.

The invention discloses a preparation method and application of a beta-FeOOH-loaded graphene oxide catalyst. The preparation method comprises the following steps: dispersing graphene oxide in water, carrying out ultrasonic treatment so as to obtain uniform dispersion liquid of graphene oxide, then adding ferric trichloride into the dispersion liquid of graphene oxide, carrying out heating in a constant-temperature water-bath so as to load beta-FeOOH onto the surface of graphene oxide and subjecting the obtained product to centrifugation, washing and drying so as to obtain the nanometer beta-FeOOH-loaded graphene oxide catalyst. The catalyst and hydrogen peroxide are added into a dye water body with a certain concentration; and under illumination of visible light, dye chroma is removed, biotoxicity is reduce, and the water body is purified. The catalyst is free of secondary pollution, and an intermediate produced in the reaction has obvious reduced biotoxicity; reaction conditions are mild, and the reaction can be carried out under the condition of visible light; process flow is simple in operation; raw materials used for preparation of the catalyst are easily available; the reacted solid phase catalyst is easy to separate; so the catalyst has good application prospects in the field of water pollution treatment.

The invention relates to an iron oxyhydroxide modified active carbon desulfurizer which is prepared from the following raw materials in parts by weight: 120-130 parts of active carbon, 12-14 parts of iron oxyhydroxide, 4-5 parts of lignin sulfate, 4-5 parts of polyvinyl alcohol, 8-10 parts of modified attapulgite and an appropriate amount of water. According to the iron oxyhydroxide modified active carbon desulfurizer disclosed by the invention, the iron oxyhydroxide is used to efficiently desulfurate and dechlorinate, and the desulfuration effect is long in lasting time. The lignin sulfate is further used, so that raw materials such as active carbon can be uniformly dispersed in water. Therefore, the desulfurizer has a better water treatment effect, free from toxic substances and low in production cost, and can be repeatedly and recycled, thereby not only saving the industrial cost, but also laying a foundation for industrial application.

The present invention relates to Fe16N2 particles in the form of a single phase which are obtained by subjecting iron oxide or iron oxyhydroxide whose surface may be coated with at least alumina or silica, if required, as a starting material, to reducing treatment and nitridation treatment, a process for producing the Fe16N2 particles in the form of a single phase for a heat treatment time of not more than 36 hr, and further relates to an anisotropic magnet or a bonded magnet which is obtained by magnetically orienting the Fe16N2 particles in the form of a single phase. The Fe16N2 particles according to the present invention can be produced in an industrial scale and have a large BHmax value.

The present invention relates to the use of inorganic salts for increasing the adsorption of oxoanions and / or thioanalogues thereof to metal-doped ion exchangers, preferably to iron oxide / iron oxyhydroxide-containing ion exchangers, preferably from water or aqueous solutions, and also the conditioning of these metal-doped ion exchangers having increased adsorption behaviour toward oxoanions and / or thioanalogues thereof by using inorganic salts with the exception of amphoteric ion exchangers which have both acidic and basic groups as functional groups.