32results about How to "Continuous degradation" patented technology

The invention relates to a preparation method of a diatomite-loaded N-doped nanometer TiO2 photocatalysis material, which belongs to the technical fields of mineral materials and photocatalysis. The method comprises the following steps of: adding water and concentrated hydrochloric acid into diatomite mineral powder, stirring, pulping, and adding a TiCl4 aqueous solution and an NH4Cl aqueous solution, adding an ammonia aqueous solution for adjusting the pH value of a reaction liquid, and performing a hydrolytic precipitation loading and liquid phase N doping reaction on NH<4+> serving as a nitrogen source; and filtering a reaction product, washing, drying, and calcining and crystalizing in a nitrogen atmosphere to obtain the diatomite-loaded N-doped nanometer TiO2 photocatalysis material. According to the diatomite-loaded N-doped nanometer TiO2 photocatalysis material prepared with the method disclosed by the invention, the photocatalysis performance of nanometer TiO2 under visible light can be improved remarkably, a continuous degradation function on formaldehyde is realized, and the degradation rate of formaldehyde is over 86 percent within 24 hours under the condition of visible light.

The invention discloses a preparation method for an iron-ferrous sulfide composite. The method comprises the steps that elemental sulfur powders and iron sulfide powders are mixed at a a mass ratio of 1: 5-60 or pyrite powders and micron-grade iron powders are mixed at a mass ratio of 1: 5-60; the obtained mixed raw materials are put into a ball mill tank of a ball mill; the ball mill tank is filled with grinding media, and the ball mill tank is in a vacuum environment or inert gas atmosphere; and the ball mill is started, the grinding speed is 400-4000 rpm, the grinding time is 2-30 hours, the grinding media and a product are separated after grinding, and the iron-ferrous sulfide composite is obtained. The grain size of the prepared iron-ferrous sulfide composite is below 10 micrometers. The preparation method is simple, the raw materials are low in cost, and poisonous and harmful dangerous chemicals are not used or generated. The prepared iron-ferrous sulfide composite can efficiently purify chlorine-contained organic pollutants and heavy metals in water, and is especially suitable for in-situ repairing of polluted underground water.

The invention discloses a repairing device for organic polluted soil, which is provided with a water spraying pipe, a water pumping pipe and a backfilling pipe to directly transport the oxidant, the mud-water mixture and the backfilling soil respectively, and utilizes persulfate to react with fillers to generate sulfate radicals, thereby reducing pollution When the soil is sprayed and impacted, the pollutants are degraded, and the mud-water mixture that falls under the impact is pumped into the main body of the processor. Under the joint action of the ultrasonic generating device and the ultrasonic vibration column and the continuous supply of small ozone bubbles, the organic pollutants are accelerated. Degradation, the soil Particles settle at an accelerated rate into the backfill tube. The device of the present invention fluidizes the treatment process of solid pollution, carries out continuous and effective deep restoration of polluted soil, does not need to inject a large amount of oxidant into the ground, greatly reduces the waste of oxidant and the pollution of soil and groundwater, and overcomes the traditional in-situ The disadvantages of repairing are that there is no need to use major engineering machinery for ex-situ repairing to excavate the soil, and the operation is simple, economical and effective.

The invention relates to a preparation method of a natural porous mineral attapulgite as a carrier and loaded N-doped nano-TiO2 visible light catalyst, which belongs to the technical field of mineral material processing and photocatalysis. Add water and hydrochloric acid to the calcined and purified attapulgite ore powder, stir and make slurry, then add TiCl4 solution and (NH4)2SO4 solution; add ammonia solution to adjust pH, and use NH4+ as nitrogen source to carry out hydrolysis precipitation loading and N doping reaction; The reaction product is filtered, washed, dried and calcined to obtain a nitrogen-doped attapulgite-supported nano-TiO2 visible light catalyst. The prepared N-doped attapulgite-supported nano-TiO2 visible light catalyst reduces the band gap of TiO2 from 3.0 to 3.2eV to below 2.8eV, which can significantly improve the photocatalytic performance of nano-TiO2 under visible light; The degradation rate of formaldehyde reaches over 90% within 8 hours.

The invention discloses a microwave catalyst for degrading organic wastewater and a catalytic oxidation degradation method thereof. The catalyst is of a porous structure and can be used for absorbing microwave, wherein in the adsorption of microwave, oxygen or air is introduced into the catalyst in the presence of water molecules so as to generate a large quantity of OH free radicals under microwave irradiation. By adopting the technical scheme, the microwave catalyst greatly improves the degradation efficiency, greatly shortens the processing time, is easy and feasible to operate, low in investment and operation costs, small in occupying area, complete in degradation, wide in concentration range of degrading the organic wastewater, easy for industrial production and suitable for treatment of organic wastewater in the industries of printing and dyeing, paper making, chemical industry, pharmacy and the like, and can perform continuous scale treatment; and moreover, the secondary pollution is avoided.

The invention discloses a preparation method and application of an oxygen-potential-deficiency magnetic copper ferrite catalyst. The preparation method comprises the following steps: (1) dissolving copper nitrate and iron nitrate into de-ionized water at the mol ratio of 1 to 2 and adding a certain amount of sodium citrate; (2) magnetically stirring the material obtained by the step (1) in an oil bath; (3) taking out the material obtained by the step (2) and drying to form sol; (4) calcining the sol obtained by the step (3) in a muffle furnace to obtain a first component; (5) reducing the first component in a hydrogen atmosphere to obtain the oxygen-potential-deficiency magnetic copper ferrite catalyst. The oxygen-potential-deficiency magnetic copper ferrite catalyst prepared by the preparation method can be used for effectively catalyzing persulfate and the catalyst is magnetic and can be used again after being magnetically separated.