48 results about "Cadmium salt" patented technology

The invention discloses application of AgNWs (at) CdZnS2 (at) Cd, Zn-ZIF-8 core-shell structure in photocatalysis and extraction of uranium from seawater, and a method comprises the following steps: filling propylene glycol containing PVP into a bottle, and magnetically stirring and heating in an oil bath; the preparation method comprises the following steps: firstly, adding NaCl into the mixed solution, continuously stirring, adding an AgNO3 solution, magnetically stirring and heating the mixed solution, collecting precipitates, and washing the precipitates with acetone and ethanol respectively to obtain gray AgNWs; the preparation method comprises the following steps: adding 2-methylimidazole into an organic solvent solution containing organic amine, mixing AgNWs, adding into an organic solvent solution of cadmium salt and zinc salt, stirring at room temperature, standing, and carrying out solid-liquid separation to obtain AgNWs (at) ZIF8; the preparation method comprises the following steps: adding AgNWs (at) ZIF8 into an organic solvent, dropwise adding an organic solvent solution of the AgNWs (at) ZIF8 into the organic solvent containing thiourea in a grinding process, heating the mixture in a water bath, carrying out vacuum drying at room temperature, and cooling to room temperature after the reaction is finished, so as to obtain the AgNWs (at) CdZnS2 (at) Cd, Zn-ZIF-8 photocatalytic material. According to the invention, AgNWs (at) ZIF8 is used as a precursor to prepare an AgNWs (at) CdZnS2 (at) Cd, Zn-ZIF-8 core-shell structure, and the core-shell structure has excellent ability to extract uranium from seawater.

The invention belongs to the technical field of corrosion inhibition of ocean engineering structure metal materials, and particularly relates to a double-Z-type heterojunction photo-anode film and a preparation method and application thereof. The preparation method of the double-Z-type heterojunction photo-anode film comprises the following steps: (1) placing conductive glass with a conductive surface facing downwards in a first solution containing a cadmium salt, an indium salt and a sulfur source, and carrying out a first hydrothermal reaction to obtain a CdIn2S4 film; (2) putting the CdIn2S4-ZnS composite film into a second solution containing zinc salt and a sulfur source with the conductive surface facing downwards, and carrying out a second hydrothermal reaction to obtain a CdIn2S4-ZnS composite film; and (3) putting the CdIn2S4-ZnS-Zn3In2S6 composite film into a third solution containing a zinc salt, an indium salt and a sulfur source with the conductive surface facing downwards, and carrying out a third hydrothermal reaction to obtain the CdIn2S4-ZnS-Zn3In2S6 composite film. According to the double-Z-type heterojunction photo-anode film, efficient photoelectric cathode protection of an ocean engineering structure can be achieved, and the durability of the ocean engineering structure is improved.

The invention relates to the technical field of nano-catalysts, and discloses a preparation method and application of a ZnxCd1-xS nano-catalyst rich in sulfur vacancies, the preparation method of the ZnxCd1-xS nano-catalyst rich in sulfur vacancies is characterized by comprising the following steps: S1, mixing cadmium salt, zinc salt and thiourea in deionized water to obtain a mixed solution; and S2, putting the mixed solution into a reaction kettle for heating reaction, cooling, collecting a reaction product, washing the reaction product with deionized water, and drying the washed reaction product to prepare the ZnxCd1-xS nano-catalyst. The ZnxCd1-xS nano-catalyst synthesized by the method is uniform in dispersion, uniform in size and regular in morphology, the morphology of the obtained ZnxCd1-xS nano-catalyst is evolved into a litchi-shaped transition state with a rough surface from a spherical shape along with the rise of the reaction temperature, and then a pine tree-shaped morphology with the regular morphology is generated. In addition, the prepared catalyst is rich in certain sulfur vacancies, and the performance is remarkably improved when the catalyst is applied to the field of photocatalytic hydrogen evolution.

The invention discloses a titanium dioxide nanorod / dissimilar metal MOFs heterojunction material and a preparation method and application thereof, and belongs to the technical field of photoelectrochemistry seawater hydrogen production. Soluble nickel salt, soluble cadmium salt or soluble cobalt salt and ammonium molybdate are adopted as metal sources, spherical dissimilar metal MOFs grow on the surface of a TiO2 nanorod in situ, and the TiO2 nanorod / dissimilar metal MOFs heterojunction material is prepared. According to the present invention, the oxygen deficiency-regulated dissimilar metal MOFs material (i.e., the titanium dioxide nanorod / dissimilar metal MOFs heterojunction material) is obtained through subsequent acid etching and annealing treatment, the material is subjected to in-situ reconstruction during the OER process to spontaneously form the active hydroxide (NiOOH) of anion protection (MoO4 < 2->), and the excellent stability is represented; only small Faraday efficiency loss (1.2-2.3%) occurs in a high chloride ion environment (3.5 wt%-7wt% of NaCl), and an extensible path is provided for industrial-scale solar hydrogen production by using seawater.

This invention relates to the field of materials preparation technology, specifically disclosing a method for preparing tungsten-molybdenum alloy powder based on a coprecipitation precursor. The method involves mixing sodium tungstate, sodium molybdate, and water to prepare a tungsten-molybdenum mixed solution; mixing the tungsten-molybdenum mixed solution with a precipitant solution containing zinc or cadmium salts, and allowing the tungsten and molybdenum to coprecipitate under stirring; filtering and washing the reaction slurry to obtain a wet precipitate of tungsten-molybdate coprecipitate, with the filtrate serving as the mother liquor; drying and grinding the wet precipitate of tungsten-molybdate coprecipitate to obtain tungsten-molybdate coprecipitate powder; and reducing the tungsten-molybdate coprecipitate powder in a hydrogen stream at 700-1000°C to obtain tungsten-molybdenum alloy powder and zinc or cadmium vapor. This invention combines the reduction and alloying reactions into one, with a reaction temperature below 1000°C, shortening the tungsten-molybdenum alloy powder preparation process and significantly saving energy and reducing consumption.

To provide an aqueous solution for solution processing for forming a conductive oxide thin film having high density, high optical transmittance, low surface roughness, and good electronic properties, as well as the formed thin film and a method for forming the thin film.SOLUTION: A precursor solution for producing a conductive oxide thin film is prepared from metal salts comprising indium, tin, titanium, and cadmium salts, and numerous combinations thereof. These salts have purity levels of at least 99% to at least 99.999%. These salts may be metal nitrates, or they may be metal halides such as chlorides. The solution is aqueous. The solution may be an aqueous solution comprising In(NO3)3, and at least one of SnCl2 and SnF2. The solution may be an aqueous solution comprising In(NO3)3 and TiCl3. The solution may be an aqueous solution comprising Cd(NO3)2, and at least one of SnCl2 and SnF2.SELECTED DRAWING: Figure 1

The invention relates to the technical field of preparation of high-purity inorganic nano materials, and discloses a controllable preparation method of a high-purity cadmium telluride nanocrystal, which comprises the following steps: pre-dissolving a conjugated acid salt in a water-phase reaction system, and reacting a cadmium salt precursor with a tellurium source precursor when ammonia gas is introduced as an inorganic gaseous ligand; a pH buffer system is constructed by ammonia gas and conjugated acid salt, and transient stability is provided for the generated cadmium telluride nanocrystals within the pH range for inhibiting the cadmium hydroxide impure phase; according to the method disclosed by the invention, an in-situ pH buffer system is constructed, so that a ligand stabilization function of the ammonia gas is decoupled from an alkaline side reaction phase of the ammonia gas, agglomeration is prevented while an impure phase is inhibited, the ligand and the salt are thoroughly removed after the reaction, and the technical problem that controllability and high purity cannot be obtained at the same time in an inorganic aqueous phase method is solved.

The invention provides an aqueous cadmium ion-vanadium dioxide battery as well as a preparation method and application thereof, and relates to the field of ocean energy storage. The battery comprises a negative electrode, a positive electrode, a diaphragm and an aqueous electrolyte, the negative electrode is metal cadmium or cadmium-based alloy; the active material of the positive electrode is metastable monoclinic phase vanadium dioxide; the diaphragm is a glass fiber diaphragm; the aqueous electrolyte is an aqueous solution containing cadmium salt; the total concentration of the cadmium salt in the aqueous electrolyte is 1-4 mol / L. The aqueous vanadium dioxide-cadmium metal secondary battery disclosed by the invention has the advantages of safe aqueous electrolyte system, high rate capability, ultra-long cycle life and the like, and has remarkable advantages when being applied to ocean energy storage.

The present invention belongs to the technical field of corrosion inhibition of metal materials for marine engineering structures, and specifically relates to a double Z-type heterojunction photoanode film, a preparation method thereof, and an application thereof. The preparation method of the double Z-type heterojunction photoanode film of the present invention comprises the following steps: (1) placing the conductive surface of the conductive glass downward in a first solution containing a cadmium salt, an indium salt, and a sulfur source, and performing a first hydrothermal reaction to obtain a CdIn2S4 film; (2) placing the conductive surface downward in a second solution containing a zinc salt and a sulfur source, and performing a second hydrothermal reaction to obtain a CdIn2S4-ZnS composite film; (3) placing the conductive surface downward in a third solution containing a zinc salt, an indium salt, and a sulfur source, and performing a third hydrothermal reaction to obtain a CdIn2S4-ZnS-Zn3In2S6 composite film. The double Z-type heterojunction photoanode film of the present invention can achieve efficient photocathodic protection of marine engineering structures and improve the durability of marine engineering structures.

The present invention discloses a method for preparing a Ti3C2MXene / CdTiO3 heterojunction photocatalyst. The present invention adopts EDTA complexation and solvent thermal method to prepare Ti3C2MXene / CdTiO3 heterojunction photocatalyst. A soluble cadmium salt and a complexing agent are added to deionized water to obtain an EDTA-Cd solution, which is added to an ethanol solution of tetrabutyl titanate under magnetic stirring. After uniform stirring, the pH of the solution is adjusted with sodium hydroxide, and then Ti3C2MXene is added. A solvent thermal reaction is then carried out to obtain a Ti3C2MXene / CdTiO3 heterojunction photocatalyst with good visible light catalytic performance. The photocatalyst obtained by the method of the present invention can achieve a degradation rate of 76% for rhodamine B in water under visible light. Ti3C2MXene / CdTiO3 makes up for the shortcomings of CdTiO3, such as large band gap, ultraviolet light response, and low photocatalytic activity. In addition, Ti3C2MXene / CdTiO3 has good stability and can still maintain good catalytic activity and stability after five cycles of degradation. The method of the invention is economical, green and has good industrial application prospects.

The application discloses a CuO-CdO / OH-Hbeta acidic catalyst and a preparation method and application thereof, the catalyst comprising an OH-Hbeta molecular sieve carrier with hierarchical pores, and CuO and CdO being loaded on the OH-Hbeta molecular sieve carrier; the CuO accounts for 1-10wt% of the total mass of the catalyst, and the CdO accounts for 1-10wt% of the total mass of the catalyst. The preparation method comprises the following steps: calcining, alkali treating and ion exchanging Hbeta molecular sieves to obtain the OH-Hbeta molecular sieve carrier with hierarchical pores; then, the OH-Hbeta molecular sieve carrier is immersed in a mixed solution of copper salt and cadmium salt, and then taken out, dried, ground and calcined to obtain the CuO-CdO / OH-Hbeta acidic catalyst. The catalyst has the advantages of high stability, anti-coking performance, high conversion rate and service life, and the conversion rate of formaldehyde reaches 99.9%, and the content of imidazole in the reaction product reaches 72.1%.

The application belongs to the technical field of photoelectric materials, and particularly relates to a yttrium-doped CdS thin film and a preparation method and application thereof. The preparation method of the yttrium-doped CdS thin film comprises the following steps: adding a cadmium salt solution, ammonia water and a thiourea solution into water in sequence and stirring uniformly to obtain a mixed solution; immersing a conductive substrate on which a P-type chalcogenide compound absorption layer thin film is formed into the mixed solution, and performing initial deposition through water bath heating; taking out the conductive substrate after the initial deposition, immersing it into a yttrium salt solution first, and then depositing it in the mixed solution, repeating the immersing and depositing operations for 4-6 times, and washing and drying to obtain the yttrium-doped CdS thin film. The yttrium-doped CdS thin film prepared by the application is used as a buffer layer for a CZTSSe solar cell, and a photoelectric conversion efficiency of 15.19% is achieved.

The invention discloses a CdMoO4-coated MWCNT multifunctional catalyst as well as a preparation method and application thereof, and belongs to the technical field of environmental pollutant treatment. The preparation method comprises the following steps: adding cadmium salt into ethylene glycol, dissolving to obtain a mixed solution, adding multi-walled carbon nanotubes and polyethylene glycol, and uniformly stirring; and then adding an ethylene glycol solution of Na2MoO4. 2H2O, and finally carrying out solvothermal reaction to obtain the CdMoO4-coated MWCNT multifunctional catalyst. The CdMoO4-coated MWCNT multifunctional catalyst disclosed by the invention not only can be used for detecting the concentration of EE2, but also can be used for activating PMS to catalyze and remove the EE2, so that seamless connection from monitoring to treatment is realized, and an efficient scheme is provided for comprehensive prevention and control of EE2 pollution. In the application of EE2 detection, the sensor has high sensitivity, high stability and strong anti-interference performance. The catalyst has the performance of activating PMS to efficiently degrade the EE2 in the application of catalytic removal of the EE2, and has strong anti-interference performance.

The present invention discloses a cadmium-based phosphate nanoflower, a cutting fluid and a preparation method. A divalent soluble cadmium salt solution is added dropwise to a stirred phosphate buffer solution, and after stirring and reacting for a period of time, the precipitate is separated to obtain the cadmium-based phosphate nanoflower. The cadmium-based phosphate nanoflower is added to a cutting base fluid to prepare a cutting fluid with a mass fraction of 5-90 wt%. When used for machining titanium alloys, the present invention can significantly reduce the adhesion of titanium alloys to the tool and reduce the wear rate of titanium alloys and the tool. During the cutting process, the nanosheets in the cadmium-based phosphate nanoflower can adsorb on the surface of the titanium alloy to form a protective layer. Due to the special spatial structure of the cadmium-based phosphate nanoflower at the same time, the protective layer is very thick and exhibits extremely strong high-pressure resistance. At the same time, the nanomaterials have a certain repair effect, and the surface roughness of the machined titanium alloy is significantly reduced, significantly improving the machining quality of the titanium alloy.

The invention discloses preparation of an ultrafast uranyl response AgNWs (at) CZS (at) CdZn-ZIF8 flexible photoelectrode and uranyl detection application of the ultrafast uranyl response AgNWs (at) CZS (at) CdZn-ZIF8 flexible photoelectrode. The method comprises the steps that oily carbon cloth is subjected to plasma cleaning and then soaked with a mixed solution of ceric ammonium nitrate, water and nitric acid; then soaking in a mixed solution of acrylic acid, acrylonitrile and DMF (Dimethyl Formamide), and heating in a water bath; after being taken out, the polymer coating carbon cloth is added into a mixed solution of hydroxylamine hydrochloride, isopropanol and sodium hydroxide, water bath heating is conducted again, and the polymer coating carbon cloth is obtained. The preparation method comprises the following steps: magnetically stirring and heating PVP-containing propylene glycol in a water bath, quickly adding NaCl, continuously stirring, adding an AgNO3 solution, and magnetically stirring and heating; and collecting the precipitate, and washing with acetone and ethanol respectively to obtain gray AgNWs. The preparation method comprises the following steps: adding 2-methylimidazole and AgNWs into an organic solvent solution containing organic amine to obtain an AgNWs composite solution; wherein in the aqueous solution of the organic amine or the organic solvent solution, the concentration of the organic amine is 8-9%; and mixing organic solvents containing cadmium salt and zinc salt to obtain the zinc-cadmium composite solution. The AgNWs composite solution and the zinc-cadmium composite solution are respectively heated and coated on polymer coating carbon cloth, then the polymer coating carbon cloth is put into an organic solvent containing thiourea, after the mixture is heated in a water bath, vacuum drying is carried out, and the AgNWs (at) CZS (at) CdZn-ZIF8 flexible photoelectrode is obtained. According to the invention, the polymer coating carbon cloth is used as a substrate to prepare the AgNWs (at) CZS (at) CdZn-ZIF8 flexible photoelectrode, and the flexible photoelectrode has ultrafast uranyl response capability.

The present invention discloses a photocatalytic nanomaterial-microorganism hybrid and its preparation method and application. The preparation method comprises the following steps: adding graphene oxide to a mixed solution containing a water-soluble divalent cadmium salt, thiourea and polyvinyl pyrrolidone, performing a hydrothermal reaction, then washing and vacuum drying to obtain a CdX / RGO material; culturing Shewanella under aerobic conditions to obtain a bacterial solution; dispersing the CdS / RGO material in an anaerobic buffer to obtain a buffer A; centrifuging the Shewanella bacterial solution and discarding the supernatant, then dispersing the precipitate cells obtained by centrifugation into a buffer A, mixing and stirring to obtain a CdS / RGO / MR-1 material. The present invention prepares a novel hybrid of photocatalytic-biological synergistic and efficient hydrogen production, which can realize the efficient transfer of photogenerated electrons from the extracellular to the intracellular hydrogenase to promote the efficiency of light energy utilization and hydrogen production.

The invention relates to the technical field of material preparation, and particularly discloses a preparation method of tungsten-molybdenum alloy powder based on a coprecipitation precursor, which comprises the following steps: mixing sodium tungstate, sodium molybdate and water to prepare a tungsten-molybdenum mixed solution; mixing the tungsten-molybdenum mixed solution with a precipitant solution containing zinc salt or cadmium salt, and carrying out coprecipitation reaction on tungsten and molybdenum in a stirring state; filtering and washing the reaction slurry to obtain a precipitate which is tungsten molybdate co-precipitation wet slag and a filtrate which is a precipitation mother solution; the tungsten molybdate coprecipitation wet slag is dried and ground, and tungsten molybdate coprecipitation powder is obtained; and reducing the tungsten-molybdate coprecipitation powder in hydrogen flow at 700-1000 DEG C to obtain tungsten-molybdenum alloy powder and steam of zinc or cadmium. According to the method, the reduction reaction and the alloying reaction are combined, the reaction temperature is lower than 1000 DEG C, the preparation process of the tungsten-molybdenum alloy powder is shortened, and energy conservation and consumption reduction are greatly achieved.

An anthracene-based MOFs crystalline material and its preparation method and application, which relates to a metal-organic framework material and its preparation method and application, and is intended to solve the technical problems of the existing nitroaromatic explosive detection method, the detection equipment being expensive and inconvenient to carry. The stoichiometric formula of the anthracene-based MOFs crystalline material of the present invention is {Cd·(4Cl‑BDC) 0.5 (STDC) 0.5 ·L} n , wherein 4Cl-BDC is deprotonated 2,3,5,6-tetrachloroterephthalic acid, STDC is deprotonated 4,4'-stilbene dicarboxylic acid, L is 9,10-bis(N-benzimidazolyl)anthracene, and n is a positive integer. The preparation method is to add soluble cadmium salt, 2,3,5,6-tetrachloroterephthalic acid, 4,4'-stilbene dicarboxylic acid and 9,10-bis(N-benzimidazolyl)anthracene to a solvent for solvothermal reaction. The material can be used to detect trace trinitrophenol of 0 to 5 ppm and is used in the field of fluorescent sensors for environmental pollutants.

The application discloses a preparation method and application of a cadmium-based fluorescent probe material. The probe compound is obtained by using inorganic cadmium salt and o-phenanthroline as reactants through water bath reaction, and has a chemical formula of [Cd(phen)2(NO3)2], and cell parameters of alpha=90.00°, beta=105.939(1)° and gamma=90.00°. The probe compound has high fluorescence emission efficiency and fluorescence stability, can produce fluorescence quenching effect on Fe 3+ , Co 2+ and Cr2O7 2‑ of different concentration ranges, and can produce fluorescence enhancement effect on SCN ‑ , Br ‑ and I ‑ of different concentration ranges. The probe compound has simple synthesis process, cheap and easily obtained raw materials, good stability, high yield and high purity, can produce specific response to Fe 3+ , Co 2+ , Cr2O7 2‑ , SCN ‑ , Br ‑ and I ‑ at the same time, and has good application prospect.

The invention discloses a CdS semiconductor photoelectrode with an adjustable crystal face and a preparation method and application thereof, and belongs to the field of electrodes. The preparation method of the CdS semiconductor photoelectrode comprises the following steps: (1) dissolving a water-soluble cadmium salt and a sulfur source in a solvent, mixing to obtain a reaction solution, putting FTO glass into the reaction solution in a manner that a conductive surface faces downwards, and carrying out a hydrothermal reaction; and (2) after the hydrothermal reaction is finished, washing the FTO glass on which the yellow film grows, and then calcining to obtain the FTO glass. The crystal face of the CdS semiconductor photoelectrode is regulated and controlled based on the hydrothermal reaction, and controllable growth of the crystal faces (002) and (100) of CdS crystals is achieved. Wherein the CdS semiconductor photoelectrode with the highest (002) crystal face proportion has the optimal anisotropic charge separation capability, so that auxiliary-light-free charging under high current density is realized, and the auxiliary-light-free charging current density reaches 5.24 mA cm <-2 >.

The invention provides a cadmium sulfide light quantum dot, a preparation method and application thereof, and a method for detecting iron content. The preparation method of the cadmium sulfide light quantum dot comprises the following steps: (1) mixing strong base, a compound containing carbon-sulfur double bonds and alcohol amine I to obtain a sulfur-containing ligand; mixing alginate and water-soluble cadmium salt II, so as to obtain an alginate-cadmium ion chelate; (2) mixing a sulfur-containing ligand with the alginate-cadmium ion chelate compound to obtain a mixture III; the cadmium sulfide light quantum dot can generate a fluorescence quenching effect on iron ions, can detect the content of trace iron in glass, is stable in detection and small in error, and is suitable for industrial production and application.

The invention relates to the technical field of composite materials, in particular to a CdZnS-based composite material and a preparation method and application thereof. The preparation method of the CdZnS-based composite material comprises the following steps: mixing soluble zinc salt, soluble cadmium salt and water to obtain a mixed solution; adding ethylenediamine and thioacetamide into the mixed solution, and carrying out hydrothermal reaction at 175-185 DEG C to obtain amino-doped CdZnS (marked as N-CZS); the preparation method comprises the following steps: mixing amino-doped CdZnS, molybdenum disulfide (recorded as MS) and an organic solvent, and violently stirring or treating with a cell crusher to obtain a CdZnS-based composite material (recorded as MS / N-CZS); the CdZnS-based composite material disclosed by the invention has excellent photocatalytic performance.

The application provides a water-based cadmium ion-vanadium dioxide battery and a preparation method and application thereof, and relates to the field of marine energy storage.The application comprises a negative electrode, a positive electrode, a diaphragm and a water-based electrolyte; the negative electrode is metal cadmium or a cadmium-based alloy; the active substance of the positive electrode is metastable monoclinic phase vanadium dioxide; the diaphragm is a glass fiber diaphragm; the water-based electrolyte is an aqueous solution containing cadmium salt; and the total concentration of the cadmium salt in the water-based electrolyte is 1-4 mol / L.The water-based vanadium dioxide-cadmium metal secondary battery has the advantages of a safe water-based electrolyte system, high rate performance and super-long cycle life, and has significant advantages in marine energy storage.

The invention provides a core-shell structure high-performance quantum dot material and a preparation method and application thereof, and belongs to the technical field of quantum dot materials. A NaHTe aqueous solution is added into a solution containing sodium citrate and cadmium salt, glutathione and a zinc precursor solution are added, a reaction is performed to prepare sodium citrate modified CdTe / CdS / ZnS quantum dots, the sodium citrate modified CdTe / CdS / ZnS quantum dots react with black phosphorus quantum dots, nitrogen-doped sulfur quantum dots and mercaptoacetic acid to prepare a compound, and then the compound is coated with a silicon dioxide layer to prepare the core-shell structure high-performance quantum dot material. The core-shell structure high-performance quantum dot material prepared by the invention has better photoelectric efficiency and high quantum efficiency, the service life is prolonged, the resistance of quantum dots to environments such as oxygen and moisture is improved, the retention rate of optical performance is increased, and the core-shell structure high-performance quantum dot material has a wide application prospect.

The invention discloses a CuO-CdO / OH-H [beta] acidic catalyst and a preparation method and application thereof. The catalyst comprises an OH-H [beta] molecular sieve carrier with hierarchical pores, and CuO and CdO are loaded on the OH-H [beta] molecular sieve carrier; cuO accounts for 1-10 wt% of the total mass of the catalyst, and CdO accounts for 1-10 wt% of the total mass of the catalyst. The preparation method comprises the following steps: carrying out calcination treatment, alkali treatment and ion exchange on an H beta molecular sieve to prepare an OH-H beta molecular sieve carrier with hierarchical pores; dipping the OH-H beta molecular sieve carrier in a mixed solution of copper salt and cadmium salt, taking out the OH-H beta molecular sieve carrier, drying, grinding, and calcining to obtain the CuO-CdO / OH-H beta acidic catalyst. The catalyst provided by the invention not only has higher stability and anti-coking performance, but also has the advantages of higher conversion rate, long service life and the like, the formaldehyde conversion rate reaches 99.9%, and the imidazole content in a reaction product reaches up to 72.1%.

The invention relates to the technical field of photocatalysts, and particularly discloses an Er / Cd doped nanometer Bi4O5Br2 photocatalyst and a preparation method thereof.The preparation method of the Er / Cd doped nanometer Bi4O5Br2 photocatalyst comprises the following steps that firstly, a bismuth salt solution is prepared, and the molar concentration of Bi < 3 + > in the bismuth salt solution is 4-6 mmol / L; 2, adding a cetyl trimethyl ammonium bromide solution into the bismuth salt solution, carrying out ultrasonic stirring, and adjusting the pH value to obtain a first solution; and step 3, adding erbium salt and cadmium salt into the first solution, stirring and dissolving, reacting under a microwave condition, washing, drying, grinding and sieving to prepare the Er / Cd doped nano Bi4O5Br2 photocatalyst. The preparation method is simple, low in cost, easily available in raw materials and easy to produce. The invention provides the Er / Cd doped nanometer Bi4O5Br2 photocatalyst. The band gap of the catalyst is narrow, and various and more types of free radicals are generated. Through co-doping of Er and Cd ions, the charge separation efficiency can be improved, and electron-hole recombination is inhibited, so that excellent photocatalytic performance is obtained.

The invention relates to the technical field of catalysts, in particular to a sulfide semiconductor photocatalyst for one-step synthesis of ethylene glycol by photocatalysis of methanol and a preparation method of the sulfide semiconductor photocatalyst. The preparation method comprises the following steps: dissolving a zinc salt and a cadmium salt in water to prepare a reaction solution, adding diethylenetriamine and thiourea to prepare a hydrothermal reaction system, and carrying out a hydrothermal reaction to obtain the cadmium-zinc-zinc composite material. By utilizing the catalyst, cheap methanol can be directly utilized as a reactant to catalyze reaction under mild illumination to obtain ethylene glycol, the reaction cost is low, the requirement on reaction equipment is low, the operation is simple and convenient, the reaction environment is green and clean, and the catalyst can be recycled. The use of the catalyst provides convenience for the simplification of the subsequent complicated ethylene glycol purification and separation process, and provides a novel catalyst for the green sustainable synthesis of ethylene glycol.

The present application provides a simple and scalable preparation method for a double Z-type heterojunction photoanode film and its marine engineering application. The preparation method is as follows: (1) solution preparation: dissolving indium salt and cadmium salt in deionized water to form a first solution; dissolving vanadate and molybdate in warm water to form a second solution; (2) precipitation method: slowly adding the second solution to the first solution, adjusting the pH to obtain a precipitate, washing and drying, and calcining at high temperature to obtain InVO4–CdMoO4 nanoparticles; (3) ion layer deposition method: immersing the InVO4–CdMoO4 nanoparticles in a cadmium salt solution and a Na2S solution in sequence, and generating CdS through multiple cycles of deposition to obtain an InVO4–CdMoO4–CdS double Z-type heterostructure. The double Z-type heterojunction photoanode film prepared by the co-precipitation and ion layer deposition method of the present invention can provide multiple, directional charge separation channels through CdMoO4 as an "electron trap" and "recombination center", effectively improving the cyclic stability of the photoanode photoelectric reaction and enhancing the durability of marine engineering structures.

The invention relates to the technical field of metal organic framework photosensitive materials, and discloses a preparation method of a cadmium-naphthalimide photochromic material. According to the method, a cadmium salt, a naphthalene diimide ligand (N, N '-bis (4-pyridylmethylene)-1, 4, 5, 8-naphthalene diimide) and a thiophene-2, 5-dicarboxylic acid ligand are used as reagent raw materials, a solvothermal method is adopted for constant-temperature synthesis reaction, the structural formula of the photochromic material obtained through the reaction is [Cd (DPMNI) (H2TDC)] n (DPMNI = (N, N'-bis (4-pyridylmethylene)-1, 4, 5, 8-naphthalene diimide), H2TDC = thiophene-2, 5-dicarboxylic acid), and the structural formula of the photochromic material obtained through the reaction is shown in the description. The unit cell parameters are as follows: a = 23.259 (4), b = 10.2229 (17), c = 12.294 (2), and alpha = beta = gamma = 90 degrees. The preparation method is simple and easy to implement, convenient to operate and capable of realizing large-scale production, and the prepared cadmium-naphthalimide photochromic material can generate obvious color change within an extremely short time after being in contact with amine substances, so that not only can a detection result be fed back in time, but also filter paper can be made, and the application prospect is wide. The amine substances are visually detected, so that the detection efficiency is greatly improved, and various field emergency detection requirements are met.

The invention discloses a photocatalytic material for immobilizing technetium and a preparation method and application thereof.The preparation method comprises the steps that sodium sulfide with the concentration being 1-10 mol L <-1 > and oxysalt of sulfur with the same concentration are prepared and then mixed, and a first mixed solution is obtained; and vigorously stirring the first mixed solution, dropwise adding a cadmium salt aqueous solution with the concentration of 1-6 mol L <-1 >, continuously stirring, standing and precipitating, washing the obtained precipitate with water for 2-3 times, filtering and drying to obtain the photocatalytic material for immobilizing technetium. The prepared photocatalytic material for immobilizing technetium has the advantages that the adsorption surface rich in sulfur is used for driving migration of photon-generated carriers, the carrier recombination rate is reduced, the number of reaction sites is large, and the like. Meanwhile, the photocatalytic material can effectively fix technetium in a solution in a neutral solution with the pH value of 7 by utilizing visible light, an antioxidant stable technetium sulfide phase is formed in situ, no heavy metal cadmium is dissolved out basically, and the photocatalytic material has environmental friendliness of waste discharge treatment.