55results about How to "Effective catalytic degradation" patented technology

The invention belongs to the field of photocatalytic chemistry, and particularly relates to a rhodamine B-doped modified titanium concentrate photocatalyst. A crystalline phase composition of the catalyst comprises the following components in percentage by weight: 15-20 percent of titanomagnetite, 30-40 percent of ilmenite, 20-(-30) percent of titanium dioxide, 20-35 percent of titanium oxide and0.9-7 percent of undecomposed rhodamine B, wherein the specific surface area is 351-528m<2> / kg, and the average particle diameter is 10-16mum. A preparation process of the catalyst comprises the following steps of: crushing massive titanium concentrate; mixing the crushed titanium concentrate with the rhodamine B according to different doping proportions; performing ultrasonic dispersion, ball milling and wet mixing, drying and grinding on mixed powder; performing low-temperature roasting and activation on the obtained compound; cooling and then grinding. The rhodamine B-doped modified titanium concentrate photocatalyst has high light absorption and light response under the excitation of visible light, is used for catalyzing photodegradation of organic and inorganic pollutants and complexsystems in water, and has high social and economic benefits.

The invention belongs to the technical field of photocatalysts, and particularly relates to a rod-like g-C3N4@SnIn4S8 composite photocatalyst and a method for preparing the same. The method for synthesizing the rod-like g-C3N4@SnIn4S8 composite photocatalyst by the aid of hydrothermal processes includes calcining urea at the high temperatures to obtain pure g-C3N4; weighing the g-C3N4, dissolvingcrystallized tin tetrachloride (SNCl4.5H2O) in deionized water, carrying out ultrasonic treatment, adding quantitative indium nitrate hydrate [In(NO3)3.5H2O] and thioacetamide (C2H5NS) into the deionized water, stirring the indium nitrate hydrate [In(NO3)3.5H2O], the thioacetamide (C2H5NS) and the deionized water to obtain mixtures, transferring the mixtures into a reaction kettle and keeping thetemperatures of the mixtures in a drying oven constant; carrying out negative-pressure suction filtration after reaction is completely carried out and washing and drying reaction products to obtain samples. The urea is a raw materials for the rod-like g-C3N4@SnIn4S8 composite photocatalyst. The rod-like g-C3N4@SnIn4S8 composite photocatalyst and the method have the advantages that the rod-like g-C3N4@SnIn4S8 composite photocatalyst prepared by the aid of the method is mainly applied to photocatalysis, gas adsorption and separation, chemical sensors and the like; the method is simple and is easy to operate, low in cost and free of pollution, and accordingly the rod-like g-C3N4@SnIn4S8 composite photocatalyst and the method have excellent application prospects in the technical field of environmental pollution control.

The invention discloses a method for in-situ synthesis of a FeOOH / Fe3O4 / cellulose composite material and application thereof. The preparation method comprises the following steps: dissolving cellulosepretreated by mechanical activation in cooperation with FeCl3 into a NaOH / urea solution; by taking a cellulose solution as a precipitator and a template agent, synthesizing a Fe3O4 / cellulose compoundin situ by adopting a coprecipitation method; then generating needle-shaped FeOOH on the surface of the Fe3O4 / cellulose to obtain the FeOOH / Fe3O4 / cellulose composite material which is used for catalytic degradation of Congo red. The composite material has a very good catalytic degradation effect, and is good in reuse performance and stability. The method disclosed by the invention is simple and low in cost, and the synthesized FeOOH / Fe3O4 / cellulose composite material is good in stability, can effectively and quickly catalyze and degrade dye Congo red in heterogeneous Fenton reactions, and hasa good application prospect.

The invention belongs to the field of catalyst preparation, and specifically discloses a preparation method and a product of a self-supporting VO2 Fenton-like catalytic material. The preparation method comprises the following steps: (1) preparing V2O5 sol and aging; (2) immersing anode and cathode conductive base materials into the V2O5 sol for carrying out electrophoretic deposition to obtain a V2O5-coated conductive base material; (3) putting the V2O5-coated conductive base material prepared in the step (2) in a tubular furnace, and carrying out calcinations under a ventilation condition, wherein the heating rate of calcinations is 1 to 20 DEG C per minute, the temperature of calcinations is 600 to 1000 DEG C, the holding time is 0.5 to 10 h, and the air introduction speed is 0.1 to 10 Lper minute, therefore, the self-supporting VO2 Fenton-like catalytic material is obtained. The self-supporting VO2 Fenton-like catalytic material prepared in the invention has excellent self-supporting characteristic and catalytic performance, and is free of secondary pollution to the environment, so that low-cost and large-scale production can be realized.

The invention provides preparation of a copper metal complex and application of the copper metal complex in a photodegradation catalyst. The chemical formula of the complex is [Cu (L) (AIP) (H2O). H2O] n, wherein H2AIP is equal to 5-aminoisophthalic acid, and L is equal to 3, 5-bis (1H-benzimidazole-1-yl) pyridine. The copper metal complex is of a two-dimensional structure formed by self-assembling copper ions through AIP <2-> and an L ligand. The copper complex has stable and efficient catalytic photodegradation dye properties: methylene blue is basically completely degraded within 60 minutes, and is easy to separate and can be recycled for multiple times.

The invention belongs to the technical field of photocatalysts, and particularly relates to a rod-like g-C3N4@SnIn4S8 composite photocatalyst and a method for preparing the same. The method for synthesizing the rod-like g-C3N4@SnIn4S8 composite photocatalyst by the aid of hydrothermal processes includes calcining urea at the high temperatures to obtain pure g-C3N4; weighing the g-C3N4, dissolvingcrystallized tin tetrachloride (SNCl4.5H2O) in deionized water, carrying out ultrasonic treatment, adding quantitative indium nitrate hydrate [In(NO3)3.5H2O] and thioacetamide (C2H5NS) into the deionized water, stirring the indium nitrate hydrate [In(NO3)3.5H2O], the thioacetamide (C2H5NS) and the deionized water to obtain mixtures, transferring the mixtures into a reaction kettle and keeping thetemperatures of the mixtures in a drying oven constant; carrying out negative-pressure suction filtration after reaction is completely carried out and washing and drying reaction products to obtain samples. The urea is a raw materials for the rod-like g-C3N4@SnIn4S8 composite photocatalyst. The rod-like g-C3N4@SnIn4S8 composite photocatalyst and the method have the advantages that the rod-like g-C3N4@SnIn4S8 composite photocatalyst prepared by the aid of the method is mainly applied to photocatalysis, gas adsorption and separation, chemical sensors and the like; the method is simple and is easy to operate, low in cost and free of pollution, and accordingly the rod-like g-C3N4@SnIn4S8 composite photocatalyst and the method have excellent application prospects in the technical field of environmental pollution control.

The invention discloses a preparation method of black Ta2O5. The preparation method comprises the following steps: dissolving TaCl5 in absolute ethyl alcohol, adding an acetylacetone stabilizer, and magnetically stirring to obtain a TaCl5 sol precursor; aging the TaCl5 sol precursor in a drying oven, taking out a blocky solid at the bottom, and transferring the blocky solid into a ball milling tank, and performing ball milling to obtain tantalum oxide gel powder; feeding the tantalum oxide gel powder into a muffle furnace, heating, and performing heat preservation to obtain white Ta2O5 powder;uniformly mixing and grinding the white Ta2O5 powder and NaBH4, putting the obtained mixture into a tubular furnace, carrying out annealing treatment in a protective atmosphere, and cooling to obtainthe black Ta2O5. Low-valence Ta4<+> ions and oxygen vacancies are introduced into Ta2O5 crystal lattices to improve the visible light absorption, enhance the photo-induced electron and hole separation efficiency and realize efficient degradation of methylene blue pollutants in the water body through photocatalysis, toxic and harmful reagents are not used, the period is short, and the method is anew method capable of simply and rapidly producing the black Ta2O5 photocatalytic material on a large scale.

The invention provides a preparation method of a cadmium metal complex and an application of the cadmium metal complex as a fluorescent probe and a photodegradation catalyst. The chemical formula of the complex is [Cd(L)(H2O).5H2O]n, wherein H2L is 1,1'-(4-carboxylphenyl)-2,2'-biimidazole. The cadmium metal complex is of a three-dimensional structure formed by self-assembling cadmium ions with anL<2-> ligand. The cadmium complex has an obvious fluorescence quenching effect on ferric ions, dichromate ions and antibiotics furacilin and nitrofurantoin, can be used as the fluorescent probe, and has potential application values in the fields of environmental monitoring and life science. In addition, the cadmium complex has stable and efficient catalytic photodegradation dye properties: methylene blue, methyl orange and rhodamine B are basically and completely degraded within 60 min under the condition of visible light, and the cadmium complex is easy to separate and can be recycled for multiple times.

The invention relates to a regenerating method of organic waste water by adoption of an enzyme-mimic magnetic catalyst. According to the technical scheme, the method includes adding an inorganic acid into the organic waste water fed into a vortex mixer (1), adjusting pH to 3.5-6, feeding the acidified organic waste water after pH adjustment into a catalytic degradation reactor (2), adding the enzyme-mimic magnetic catalyst into the catalytic degradation reactor (2) containing the acidified organic waste water, adding H2O2 with the mass ratio of the enzyme-mimic magnetic catalyst to the H2O2 being 1:1-4.5, stirring at 20-30 DEG C with air blowing by an air blower (3) for 60-120 min to obtain suspension, allowing the suspension to flow automatically into a catalyst separation column (4), allowing the suspension to stand for 10-30 min under the action of a magnetic field, returning the enzyme-mimic magnetic catalyst in the lower layer to the catalytic degradation reactor (2) through a return pipe (5) to be reutilized, and using the supernatant liquid as industrial reclaimed water. The method has characteristics of simple process, high operationality, low investment, low operation cost, low running cost, and wide COD ranges of treated water.

The invention discloses a preparation method and application of a g-C3N4 / (101)-(001)-TiO2 composite material. The preparation method is simple and easy to control, a synthesized g-C3N4 / (101)-(001)-TiO2 composite photocatalytic system takes carbon nitride as a main body, and TiO2 containing surface heterojunction as an object. The conduction capability of electrons between interfaces is improved, the separation of photo-induced electron hole pairs is promoted, and the catalytic capability under visible light is improved. The composite material not only makes up the defects of g-C3N4, but also accelerates the transfer of photo-induced electron hole pairs on the interface of g-C3N4 and (101)-(001)-TiO2, and can effectively catalyze and degrade paracetamol and methylene blue under visible light.

The invention discloses a preparation method and application of MnTiO3 and F-MnTiO3. According to a hydro-thermal synthesis method which is taken as the preparation method, titanate nanowires are taken as a Ti source, MnCl2 is taken as a Mn source, NaF is taken as an F source; the hydro-thermal synthesis method can be used for preparing the MnTiO3 and the F-MnTiO3 which are uniform in feature and diameter and of sheet-shaped structures on the condition of adding NaOH; and the MnTiO3 and the F-MnTiO3 are catalyzed and degraded to obtain organic dyestuff named rhodamine B under the irradiation of visible light. The MnTiO3 and the F-MnTiO3 both have catalytic degradation performance under visible light, and the F-MnTiO3 has higher catalytic performance than the MnTiO3 since an F element is doped in the F-MnTiO3 material, wherein F is an element with greatest electronegativity and can be combined with photoproduction electrons to restrain the combination of the photoproduction electrons and electron holes and further improve the photocatalytic efficiency of visible light. The preparation method provided by the invention is safe and rapid and is high in stability.

The invention provides a method for preparing a tin reduced nanometer titanium dioxide catalyst. The prior hydrogen reduction method has the deficiencies of complex process, long time consumption and high cost, and is difficult to realize industrialization. The method for preparing the tin reduced nanometer titanium dioxide catalyst comprises the following steps: weighing 1 to 100 portions of nanometer titanium dioxide powder according to a ratio in portion by weight; adding the nanometer titanium dioxide powder into a stannous chloride solution at room temperature to be immersed for 1 to 60 minutes; pumping and filtering the mixed solution; washing the filtrate by water for three times; and drying the filtrate to obtain the tin reduced nanometer titanium dioxide catalyst. The method can be used for preparing the tin reduced nanometer titanium dioxide catalyst.