82 results about "Cadmium Compound" patented technology

A method is disclosed for fabricating a integrated device, such as a MEMS device. A first wafer is provided on an exposed surface with a layer of gold, gold alloy or gold compound. A second wafer is provided on its exposed surface with under-layer of gold, gold alloy or gold compound; and an over- of bismuth, bismuth alloy, a compound of bismuth, cadmium, cadmium alloy, a compound of cadmium compound, tin, tin alloy, or a compound of tin. The wafers are then brought into contact and bonded at their surfaces through the deposited layers.

The invention discloses a carbon-based composite material for arsenic and cadmium polluted soil remediation and application of the composite material. The carbon-based composite material disclosed by the invention is prepared by the steps: taking crop straws as raw materials, and charring to prepare charcoal; mixing with an iron salt solution according to a certain solid-liquid ratio, regulating the pH value of the solution in the process so as to realize coprecipitation of the two materials; performing pyrolysis, thereby obtaining the carbon-based composite material. The carbon-based composite material prepared in the invention is applied to arsenic and cadmium compound polluted soil, and methods such as turning over, watering and the like are combined, so that the content of arsenic and cadmium in an effective state can be obviously reduced; therefore, the arsenic and cadmium in the soil can be transferred to a direction with low biotoxicity and migration, the physicochemical properties of the soil can be improved to a certain degree, and the composite material is suitable to be applied to multiple types of soil. The arsenic and cadmium ions in a water body can be effectively removed, the preparation process is simple in operating steps, and the material is wide in source, low in production cost and environment-friendly.

The invention discloses a lead-cadmium compound conditioner for rice field soil as well as preparation and application methods of the lead-cadmium compound conditioner. The conditioner is composed of the raw materials in mass fractions: 30-50% of calcium carbonate, 5-10% of hydroxyapatite, 20-30% of sepiolite and 20-30% of zeolite; the preparation of the conditioner comprises the following steps of: weighing various raw materials according to the mass fractions of the components of the lead-cadmium compound conditioner; continuously stirring the various raw materials in a stirring device for at least 30 min, and thoroughly stirring and evenly mixing all the materials; and the method of application of the conditioner comprises the following steps of: (1) analyzing the total quantity of lead and cadmium in the rice field and the content of lead and cadmium in exchange state; (2) determining the pollution level of the rice field soil by using an evaluation model; (3) applying the lead-cadmium compound conditioner according to the lead-cadmium pollution level in the rice field, and applying the lead-cadmium compound conditioner to the slightly polluted rice field at 100-150 kg / mu, to the mildly polluted rice field by 150-300 kg / mu and to medium-polluted rice field at 300-600 kg / mu, and balancing and stabilizing for 10-15 days; and (4) analyzing and measuring the content of lead and cadmium in exchange state in the rice field, and if the fixed rate is lower than 90%, additionally applying the conditioner at 100-150 kg / mu.

Chemical bath deposition (CBD) has proved top be the most favorable method for application of a buffer layer to semiconductor substrates, for example, chalcopyrite thin-film solar cells, whereby previously cadmium sulphide (CdS) was deposited and as cadmium is a highly toxic heavy metal, alternatives have been required. According to the invention, the semiconductor substrate is dipped in a solution for approximately 10 minutes, produced by the dissolution of zinc sulphate (0.05-0.5 mol / l) and thiourea (0.2 to 1.5 mol / l) in distilled water at a temperature being held essentially constant throughout said period. For the first time, the ZnS layer permits comparable or higher efficiencies than conventionally only achieved with toxic cadmium compounds. The method is hence much more environmentally-friendly with the same result.

The invention relates to the technical field of repair of heavy metal contaminated soil, in particular to a passivating agent used for treating lead-cadmium compound contaminated soil as well as a preparation method thereof and a using method thereof. The passivating agent is prepared by compounding sepiolite and phosphor-containing substances. The preparation method for the passivating agent comprises the following steps: mixing acidic modified sepiolite, calcium dihydrogen phosphate and phosphorite powder, and uniformly mixing to obtain the passivating agent. The using method for the passivating agent comprises the following steps: pre-treating the lead-cadmium compound contaminated soil, performing air-drying on the contaminated soil, grinding the contaminated soil, enabling the grinded contaminated soil to pass through a 20-mesh sieve, adding the passivating agent into the pre-treated contaminated soil, adding water to uniformly mix, maintaining the uniformly mixed soil in situ, and enabling the passivating agent to sufficiently react with heavy metals in the soil. The passivating agent provided by the invention is low in raw material cost, is high in passivating efficiency, is stable in effect, and is suitable for farmland treatment with great Pb and Cd contaminated area and light contamination degree.

The invention discloses a preparation method of a low-cost cadmium phosphide quantum dot material. The preparation method comprises the following steps: based on a cheap cadmium compound such as cadmium oxide, cadmium acetate or cadmium cetylacetonate and the like as a raw material, dissolving the cadmium compound and long-chain fatty acid in octadecylene at a high temperature so as to prepare a long-chain fatty acid salt of cadmium; or dissolving cadmium cetylacetonate in organic amine, and then carrying out a gas-liquid reaction based on hydrogen phosphide as a phosphorus source so as to prepare the high-quality cadmium phosphide quantum dot luminescent material. According to the invention, a cheap and continuously operable synthesis method is provided for the cadmium phosphide quantum dot material, and a solid foundation is provided for industrialized production of the cadmium phosphide quantum dot material; and through controlling factors such as reaction temperature, time and the like, the luminescence of the cadmium phosphide quantum dot material can be achieved in a wide region ranging from visible light (460nm) to infrared light (1500nm).

The invention discloses a lead-cadmium compound conditioner for rice field soil as well as preparation and application methods of the lead-cadmium compound conditioner. The conditioner is composed of the raw materials in mass fractions: 30-50% of calcium carbonate, 5-10% of hydroxyapatite, 20-30% of sepiolite and 20-30% of zeolite; the preparation of the conditioner comprises the following steps of: weighing various raw materials according to the mass fractions of the components of the lead-cadmium compound conditioner; continuously stirring the various raw materials in a stirring device for at least 30 min, and thoroughly stirring and evenly mixing all the materials; and the method of application of the conditioner comprises the following steps of: (1) analyzing the total quantity of lead and cadmium in the rice field and the content of lead and cadmium in exchange state; (2) determining the pollution level of the rice field soil by using an evaluation model; (3) applying the lead-cadmium compound conditioner according to the lead-cadmium pollution level in the rice field, and applying the lead-cadmium compound conditioner to the slightly polluted rice field at 100-150 kg / mu, to the mildly polluted rice field by 150-300 kg / mu and to medium-polluted rice field at 300-600 kg / mu, and balancing and stabilizing for 10-15 days; and (4) analyzing and measuring the content of lead and cadmium in exchange state in the rice field, and if the fixed rate is lower than 90%, additionally applying the conditioner at 100-150 kg / mu.

The invention relates to a fragrant warming plaster and a preparation method thereof. A production formula of the fragrant warming plaster comprises 55-66% of reduced iron powder, 1-1.5% of water absorbent resin, 20-30% of purified water, 1-3% of edible salt, 3-10% of vermiculite and 5-9.5% of activated carbon. The preparation method comprises the following steps of: (1) taking reduced iron powder, water absorbent resin and vermiculite according to the proportions in the formula, adding the materials into a sugar coating machine, and uniformly stirring the materials; (2) after the machine stops, adding purified water into the raw materials obtained in the step (1) according to the proportion in the formula, and soaking the raw materials for 10 min; (3) successively adding edible salt and activated carbon into the raw materials obtained in the step (2) according to the proportions in the formula, and uniformly stirring all the raw materials in the sugar coating machine; and (4) adding 0.1-0.5 kg of essence into each 10 kg of total weight of the raw materials obtained in the steps (1), (2) and (3), and uniformly stirring the essence and the raw materials to obtain the fragrant raw materials, loading the fragrant raw materials into high molybdenum and cadmium compound bags after stirring, and sealing the compound bags for future use. The fragrant warming plaster has the advantage of fresh and pleasant fragrance and has the characteristics of ameliorating working and living environment and improving life taste and working efficiency.

The invention belongs to a method for preparing a cadmium compound quantum dot fluorescent thin film. First prepared amphiphilic resin is used to perform cladding phase transfer treatment on an oil soluble cadmium compound quantum dot, and a water-soluble quantum dot is obtained; tetraethyl orthosilicate and a silane coupling agent are used to further perform cladding treatment on the water-soluble quantum dot, and the cadmium compound quantum dot coated with SiO2 is obtained and mixed with a resin solution to prepare the fluorescent thin film. The cadmium compound quantum dot fluorescent thin film not only has the advantage of reserving high fluorescence quantum yield of the oil soluble quantum dot, but also obviously improves stability of the quantum dot and dispersibility in the resin. The obtained fluorescent thin film is high in light transmittance, and the property not only can be applied to a backlight display technology and can also be widely applied to the field of lighting.

The invention relates to the field of environment-friendly paint, in particular to double-ingredient chrome-free water-based metal anticorrosive paint and a preparation method thereof. The anticorrosive paint comprises an ingredient A and an ingredient B, wherein the ingredient A is prepared from ingredients including zinc powder, aluminum power, passivants, dispersing agents and surfactants. The ingredient B is prepared from ingredients including silane coupling agents, boracic acid, passivant, natural zeolite and deionized water. The preparation method comprises the following steps that the ingredient A is stirred and mixed to prepare the ingredient A; firstly, the natural zeolite, the passivant and the deionized water are mixed, and are then mixed and stirred with the silane coupling agents and the boracic acid to prepare the ingredient B. Before use, the ingredient A and the ingredient B are mixed, stirred and uniformly prepared into finished product paint according to a weight proportion of 1:(1.3-1.4); the paint can be coated in a brush coating, spray coating or dip-coating mode; heating is used for sintering curing. The double-ingredient chrome-free water-based metal anticorrosive paint has the advantages that no heavy metal ionic compound such as hexavalent chromium, lead, mercury and cadmium compound exist; volatile noxious solvents such as benzene and xylene are not contained; the storage stability of the finished product paint is greatly improved; the anti-corrosion performance of a coating is also improved.

The invention discloses a blue-light-emitting fluorescent material and a preparation method thereof. The invention is characterized in that the fluorescent material is a cadmium compound of orotic acid, which is prepared by carrying out chemical reaction on orotic acid with carboxylic acid, phenanthroline and cadmium ions with optical activity; the molecular formula of the fluorescent material is C44H52N12O28Cd2, the crystal system is triclinic, and the space group is P-1; and the cell parameters are as follows: a=9.5220 Angstroms, b=11.8790 Angstroms, c=12.6141 Angstroms, alpha=73.082 degrees, gamma=78.073 degrees, and beta=81.100 degrees. The cadmium ions are in a pentagonal bipyramidal coordination mode, two nitrogen coordinating atoms are from the phenanthroline, three oxygen coordinating atoms are from orotic acid, and two oxygen coordinating atoms are from water. The fluorescent material has the advantages of accurate space structure and accurate molecular formula, and contains abundant Cd(II) ions with optical activity and carboxylic acid with strong coordinating capacity, thereby being beneficial to electron transition and energy transmission. The fluorescent material has favorable photoelectric activity and favorable blue light emission performance.

The invention relates to a cadmium sulfide nano particle sensibilizer, process for making and use thereof, wherein the process comprises, dispersing the water soluble cadmium compound solution and water soluble sulfur-containing compound into water soluble macromolecular compound, mixing under the temperature of 10-100 deg.C, stirring, thus obtaining the sensibilizer comprising cadmium sulfide nano particles, water-soluble inorganic substance and water-soluble macromolecular compound. The silver sulfide hypersensitizing speckle distribution formed by the sensibilizer according to the invention is easy to control, thus can reduce latent image dispersion, improve luminous sensitivity and contrast.

The invention relates to a novel solar power generation device. The device consists of a solar power generation spherical shell, a reflection condensing mirror, an inverter, a storage battery and a controller, wherein the solar power generation spherical shell is spliced by power generation module blocks and is fixed to the surface of a metal or fiber reinforced resin composite material spherical support; the outer diameter of the solar power generation spherical shell is between 100 and 100,0000 mm; the illuminated face of a power generation module is prepared from organic or inorganic material composite films which are positioned, assembled and dispersed by one or all metal nanoparticles such as nanometer graphene, carbon nanotubes, nano carbon black, cadmium compound, lead (Pb), aluminum (Al) and the like; and any surface of the solar power generation spherical shell is positioned at focal positions of reflected light rays on the inner surface of the reflection condensing mirror all the time, so that light irradiated on the surface of the condensing mirror can be reflected to the surface of the solar power generation spherical shell.

The invention discloses a blue fluorescent material and a preparation method thereof. Sulfaquinoxaline and 4,4'-bipyridyl which have conjugate phi bonds and cadmium ions with optical activity are chemically reacted to prepare a sulfaquinoxaline cadmium compound with a certain spatial structure, and the molecular formula of the sulfaquinoxaline cadmium compound is C42H40CdN10O6S2, wherein M is equal to 957.36. The crystal system is monoclinic; the space group is C2 / c; and in the unit cell parameters, alpha is 90.00 degrees, beta is 126.005 degrees, and gamma is 90.00 degrees. Because of Cd (II) ions of rich optical activity and conjugate phi bonds, the compound fluorescent material is favorable for electron transition and energy transfer, has good photoelectric activity, shows good blue emitting performance, and can be used as a fluorescent material.

The invention discloses an earthy yellow glaze special for Nixing ceramics. Calcium borate, zirconium silicate, cerium oxide, zinc oxide, titanium dioxide, quartz, feldspar, limestone and dolomite are mixed up, fed with water, subjected to ball-milling, sieved and aged to prepare the raw glaze. The raw glaze is yellow after the firing process and can be strongly adhered to Nixing green-ware bodies. Meanwhile, the black raw glaze is very low in lead compound content and cadmium compound content. When the earthy yellow raw glaze is applied to the production process for product decoration, the ceramic characteristics of the Nixing ceramics are reserved. The labor intensity is reduced. Meanwhile, the decorative color effect of the glaze is realized at the same time.

Provided are a photocatalyst which is high in catalytic activity, is nontoxic, has a long life, allows visible light to be used directly for its photocatalytic reaction and is especially useful for hydrogen generation, and a process for producing it. It contains a cadmium compound, has a capsular structure, has an average particle diameter of 100 nm or less and can be manufactured by dropping a solution of a cadmium salt into a solution of a sodium compound or admixing a solution of a sodium compound in a suspension of particles of a cadmium compound.

The invention relates to a method for growth of compound cadmium sodium borate crystal; according to the method, the compound cadmium sodium borate crystal is prepared as follow: mixing compound cadmium sodium borate with cosolvent B2O3-R system or Na2B4O7, heating, performing homoiothermy, cooling to obtain a cadmium sodium borate and cosolvent mixed molten liquid, putting seed crystals loaded on a seed crystal rod in the prepared mixed molten liquid, simultaneously rotating the seed crystal rod, cooling, and then slowly cooling to obtain a required crystal, lifting the crystal off from the liquid surface, and cooling to the room temperature to obtain the compound cadmium sodium borate crystal. The method has the advantages of fast growth and low cost, the Na2Cd7B8O20 crystal with the size of 20mm * 20MM * 10mm and high optical quality can be grown, and the crystal obtained through the method is good in mechanical performance and not easy to break and deliquesce and is easy to process.

The invention belongs to the technical field of heavy metal pollution treatment, and discloses a treatment method of heavy metal cadmium pollution. The method comprises the following steps: S1, crushing cadmium-containing slag to obtain cadmium-containing slag powder; S2, adding lime to the cadmium-containing slag powder; and uniformly mixing to obtain a cadmium-containing slag mixture; and S3, adding an alkaline calcium activating agent, a curing agent, an acidic substance, a microbial complex microbial agent and water to the cadmium-containing slag mixture; mixing to obtain a curing mixture;and curing the curing mixture to form a curing product. according to the method, cadmium ions in the slag can be fully precipitated so as to enter a stable chemical combination state; the cadmium compound in a stable state is wrapped and cured, and thus good curing and stabilizing effects are achieved; in addition, the cadmium ions are hard to dissolve and transfer, so that the damage of cadmiumto the environment and the ecological system is reduced.

The invention discloses a green environment-friendly cadmium-compound-containing wastewater adsorbing material which is characterized by comprising the following components in parts by weight: 10-25 parts of acrylate, 1-3 parts of initiator, 3-9 parts of polypropylene fiber, 4-8 parts of aramid fiber, 2-7 parts of titanate coupling agent, 0.1-0.3 part of nano silver, 1-2 parts of maleic anhydride graft polypropylene, 2-3 parts of polyethylene terephthalate, 10-16 parts of cement ash water solution and 2-9 parts of soda lime. The material has the advantages of favorable adsorbability, low production cost and simple technical process, and is beneficial to large-scale production.

The invention relates to the technical field of phytoremediation of heavy metal compound contaminated soil, and discloses a method for remediating lead-cadmium compound contaminated soil by cooperating corn straw with sedum plumbizincicola intercropping energy plants, wherein the method comprises the following steps: corn straw is added into the lead-cadmium compound contaminated soil to obtain amatrix; sedum plumbizincicola and ricinus communis are intercropped in the middle of the matrix, and the application amount of the corn straw is 1%-2% of the mass of the lead-cadmium composite contaminated soil. According to the method, a method of utilizing the corn straw to cooperate with the sedum plumbizincicola intercropped with the ricinus communis to repair the lead-cadmium compound contaminated soil is a feasible repair mode; the content of pollutants in the lead-cadmium compound contaminated soil can be stably reduced, the yield of energy plants can be increased to a certain extent, it is guaranteed that farmers have certain economic benefits, and the actual requirement for 'simultaneous production and remediation' can be met.

The invention discloses a method for eluting heavy metal cadmium in shii-take, and belongs to the technical field of food quality and safety. According to the method, an indissolvable-state cadmium-containing component is converted into dissolvable cadmium ions or a complex with a citric acid solution as an eluent, and therefore the content of the cadmium in shii-take is reduced; by means of the method, the content of the heavy metal cadmium in shii-take can be effectively reduced, the eluting rate of the heavy metal cadmium is generally up to 20% or above, following eating cannot be influenced, and the effective ingredients in shii-take are basically free of changes. Citric acid adopted for the method is an important food additive, and the method completely meets the food safety requirement.

The invention discloses a nickel-zinc battery. An electrolyte is composed of oxyhydrogen, a corrosion inhibitor, a surface active additive, zinc oxide and deionized water, and the mass ratio is as follows: 15 to 35 percent of hydroxide alkali, 0.1 to 10 percent of corrosion inhibitor, 0.01 to 5 percent of surface active additive, a proper amount of zinc oxide until the saturate state and the balance of deionized water. The defects of the existing zinc-nickel battery are overcome, and dissolution deformation of an electrode and formation, passivation and hydrogen evolution of zinc dendrites arereduced or relieved; mercuride, cadmium compound, chromate and the like which severely pollute the environment are not contained; the prepared zinc-nickel battery is high in mass specific energy, high in output power, small in internal resistance and long in service life. The cycle life of charging and discharging of the experimental battery at room temperature can reach 400-600 times. The nickel-zinc battery is rich in raw materials, low in cost, environment-friendly, and convenient and safe to use. Therefore, requirements of various power supply fields are met, and the nickel-zinc battery is suitable for various vehicles, electric equipment, standby power supply energy storage and the like.

A disclosed composite material adsorbing cadmium-compound-containing wastewater is characterized by comprising the following substances in parts by weight: 20-35 parts of acrylic high-molecular water-absorption resin, 9-16 parts of ammonia water, 7-16 parts of gallic acid, 1-2 parts of nanometer calcium sulfate, 2-7 parts of a titanate coupling agent, 0.1-0.3 parts of nanometer silver, 1-2 parts of maleic anhydride grafted polypropylene, 2-3 parts of polyethylene glycol terephthalate, 10-16 parts of an aqueous solution of cement mortar, and 2-9 parts of alkali lime. The beneficial effects comprise that the composite material is good in adsorption performance, low in production cost, simple in technological process and beneficial for large-scale production.

The invention discloses a detection reagent for detecting mercapto compounds in urine. The detection reagent comprises a testing reagent, a control reagent and a color-developing reagent according toa volume ratio of 1:1:2, wherein the testing reagent is purified water, the control reagent is an aqueous solution of mercury-containing compounds and cadmium-containing compounds, and the color-developing reagent is a color-developing buffer solution containing phosphotungstic acid, phosphomolybdic acid and a lithium-containing compound. A preparation method comprises the following steps: (1), performing split charging on the testing reagent; (2), preparing the control reagent: dissolving the mercury-containing compounds and the cadmium-containing compounds into the purified water; (3), preparing the color-developing reagent: mixing a mixed aqueous solution of the phosphotungstic acid, the phosphomolybdic acid and the lithium-containing compound with a buffer solution. The invention has the advantages as follows: interference of uric acid, Vc and other reducing substances on mercapto groups is effectively avoided, so that occurrence of a false negative result is avoided, and thus a detection result is more accurate and reliable; in addition, the preparation method is simple and convenient, the cost is low, and large-scale production is easy.

Provided are a photocatalyst which is high in catalytic activity, is nontoxic, has a long life, allows visible light to be used directly for its photocatalytic reaction and is especially useful for hydrogen generation, and a process for producing it. It contains a cadmium compound, has a capsular structure, has an average particle diameter of 100 nm or less and can be manufactured by dropping a solution of a cadmium salt into a solution of a sodium compound or admixing a solution of a sodium compound in a suspension of particles of a cadmium compound.

The invention provides a leather standard sample for European union REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) laws high concern substance X-fluorescence spectroscopyquantitative screening and a preparation method thereof. The preparation formula of the leather standard sample is prepared from the following ingredients in parts by weight: 85 to 92 parts of leather substrates, 3 to 5 parts of stabilizing agents, 3 to 5 parts of water, 0.8 to 2.0 parts of diffusion agents and a proper amount of heavy metal compounds, wherein the content of heavy metal in the leather standard sample is 50 to 500mg / kg; the heavy metal compounds include lead compounds, cadmium compounds, mercury compounds and chromium compounds. The standard sample prepared by the method has the advantages of high uniformity and good stability; the combination condition of the heavy metal compounds and the leather substrates is consistent with a really detected leather sample; the detecting result accuracy is ensured.

The present invention discloses a metal organic compound and a preparation method and use thereof, belongs to the technical field of organic chemistry, and can effectively solve the technical problems in the aspects of preparation of a metal organic compound and use of the metal organic compound in preparation of a drug for killing liver cancer tumor cells. The metal organic compound is obtained by liquid-liquid layering diffusion method, the Chinese name of the metal organic compound is bis-3-(4 '-imidazol phenyl)-5-(pyridine-2''-yl)-1, 2, 4-triazole cadmium dehydrate, the molecular formula is [Cd (3-(4'-imidazol phenyl)-5-(pyridin-2''-yl)-1,2,4-triazole) 2.2H2O], the preparation method is disclosed, and the cadmium compound is used for preparation of an antitumor drug, or is used as a carrier for carrying the antitumor drug and the antitumor drug used in cancer.

The invention discloses pseudomonas Z-12 and application thereof in removing heavy metal cadmium. The preservation number of the pseudomonas is CCTCC No: M2020785. Manganese dioxide / hematite-cadmium compound is adopted to simulate ferro-manganese combined cadmium in soil, and the desorption efficiency of the pseudomonas on the manganese dioxide / hematite-cadmium compound reaches 81% to the maximum.The strain is used for leaching cadmium-polluted soil, the removal rates of weak acid cadmium and the ferro-manganese combined cadmium are 70% to 80% and 80% to 90% respectively, and the removal rates of total cadmium and effective cadmium are both 75% to 85%. The strain has a good biotransformation effect on the weak acid cadmium and the ferro-manganese combined cadmium in the soil, and has great application prospects in efficient treatment of the soil cadmium pollution problem by microorganisms.

The invention discloses a metal cadmium compound. A 2-methyl-4, 5 imidazole dicarboxylic acid (MIDA) ligand and cadmium acetate Cd(CH3COO)2 are synthesized under solvent thermal conditions to obtain the metal cadmium compound, a molecular structural formula of the prepared metal cadmium compound is C24H17Cd3N6O16.33, wherein Cd is a divalent metal cadmium ion, and the MIDA ligand and the cadmium ion form a three-dimensional net structure through carboxyl oxygen atoms and imidazole nitrogen atoms of 2-methyl-4, 5 imidazole dicarboxylic acid. A form of metal cadmium compound is of a structure ofa solid crystal, and crystallization of the crystal is a hexagonal system and an R-3 space group. The preparation method of the metal cadmium compound includes the step: performing reaction on 2-methyl-4,5 imidazole dicarboxylic acid and cadmium acetate Cd(CH3COO)2 under the solvent thermal conditions to obtain colorless and transparent massive crystals. The prepared metal cadmium compound can serve as a photocatalyst, and carbon dioxide is changed into carbon monoxide. A preparation process is simple and easy to implement, the purity and the yield of a product are high, and the metal cadmiumcompound has good application prospects in the aspect of photocatalytic conversion of the carbon dioxide.