967 results about "Cadmium" patented technology

The invention relates to the technical field of in-situ / ex-situ remediation of sites polluted by heavy metals such as cadmium, lead, copper and zinc, and discloses a heavy metal polluted soil remediation system and method based on intelligent management and control. The system comprises an electrode system module, an activator module, a targeted adsorption device module, an automatic monitoring system module, an intelligent decision-making system module and a photovoltaic power supply module. The method comprises the steps of driving heavy metal ions in soil to directionally migrate through an electric field; the activating agent module works, green micromolecule organic acid and other activating agents are injected in a gradient mode, and the migration efficiency of heavy metal is improved; activated heavy metal ions can be captured by an adsorption material in the targeted adsorption device module in cooperation with a selective enrichment device; meanwhile, the automatic monitoring system module collects environmental parameters in real time; the intelligent decision-making system module optimizes the remediation efficiency and energy consumption according to the real-time data, and low-cost and high-efficiency remediation of soil heavy metal pollution is achieved. The remediation efficiency is remarkably improved, and the risk of secondary pollution is reduced.

The invention provides a near-earth orbit neutron and gamma ray detector group, detection equipment and a detection method, and the detection equipment is a neutron / gamma spectrometer which is small in size, small in mass, low in power consumption and high in speed and is designed based on a multilayer single / double sensitive area Si detector and a cadmium zinc telluride (CZT) detector array. The neutron / gamma spectrometer can serve as an independent load to be carried on a small satellite, and measurement of thermal neutrons, fast neutrons below 20 MeV and gamma rays is achieved. Different layers of the detector group in the detection equipment are matched to form a plurality of anticoincidence groups, so that the accuracy of energy spectrum inversion is improved. According to the detection method, a stacking and discarding algorithm is provided, so that interference caused by signal overlapping is avoided, and the system resolution of the whole neutron / gamma spectrometer is improved.

Electrospun poly(acrylic) acid (PAA) / poly(vinyl) alcohol PVA nanofibers and integrated filtration membranes generated therefrom are disclosed herein. The membranes are suitable for use in selectively removing heavy metals such as lead and cadmium from water. The surface of the nanofibers is preferably functionalized with one or more chelating agents. The membranes have a high removal efficiency and adsorption capacity with well-distributed high-density heavy metal adsorption sites with strong binding affinities for targeted heavy metals.

The invention discloses a high-weather-resistance bismuth vanadate coating and a preparation method thereof, and belongs to the technical field of inorganic pigment modification. The high-weather-resistance bismuth vanadate coating comprises bismuth vanadate matrix particles, and the surfaces of the bismuth vanadate matrix particles are sequentially coated with an amorphous aluminum oxide layer, a cerium oxide layer and a fluorinated silicon oxide layer. The amorphous aluminum oxide layer is formed in an atomic layer deposition mode; the cerium oxide layer is formed by hydrothermal treatment of a cerium source. The preparation technology has accurate and controllable technological parameters, is suitable for industrial production, can replace the traditional toxic pigment containing lead and cadmium, and meets the requirements of environmental regulations. The bismuth vanadate coating has excellent weather resistance and chemical stability, the service life of a product can be prolonged, the maintenance cost is reduced, and a reliable solution is provided for development of high-performance environment-friendly pigments.

The invention belongs to the technical field of phosphoric acid purification, and particularly relates to a removing agent and a removing method for heavy metal cadmium in phosphoric acid. The removing agent comprises a solvent, a thiophosphoric acid trapping agent A and a thiophosphoric acid trapping agent B, wherein the thiophosphoric acid trapping agent A and the thiophosphoric acid trapping agent B are dispersed in the solvent; the thiophosphoric acid trapping agent A and the thiophosphoric acid trapping agent B are different types of thiophosphoric acid trapping agents and are respectively and independently selected from one of alkyl dithiophosphoric acid or salts thereof, phenolic dithiophosphoric acid or salts thereof and amino dithiophosphoric acid or salts thereof; and at least one hydrocarbyl dithiophosphoric acid or salt thereof is selected; the salt is sodium salt or ammonium salt; the solvent is water or an alkaline aqueous solution. According to the method, a composition of a dithiophosphoric acid trapping agent is used as a removing agent for cadmium in wet-process phosphoric acid, a precipitate which is insoluble in a strongly acidic water phase is generated after reaction, and phosphoric acid cadmium removal is realized after filtration. Compared with a conventional sulfide precipitation method, the method provided by the invention has the advantages of less cadmium residue in phosphoric acid and less pollution.

The invention discloses a method for extracting plant available cadmium in neutral-alkaline rice field soil, which comprises the following steps: naturally air-drying the soil, grinding and sieving to obtain a soil sample, weighing the soil sample, adding deionized water to enable the water content of the soil to be 35-110% of the maximum water-holding capacity of the soil, balancing at room temperature for 12-48 hours, adding a calcium chloride solution, oscillating and extracting at constant temperature, and filtering to obtain the plant available cadmium in the neutral-alkaline rice field soil. And filtering to obtain an extracting solution, measuring the concentration of cadmium in the extracting solution, and calculating the content of the plant available cadmium in the measured soil sample according to the measured mass of the soil sample and the measured concentration of cadmium in the extracting solution. The method is easy and convenient to operate and low in cost, the change characteristics of the plant effectiveness of cadmium in the neutral-alkaline rice field soil in a field water management mode can be well reflected, and the measured plant effective-state cadmium content in the neutral-alkaline rice field soil and the rice cadmium content have a better linear correlation relationship.

The invention discloses a cyanide-free cadmium-iron alloy plating process for high-strength structural steel. The cyanide-free cadmium-iron alloy plating process comprises the step that a nickel-titanium alloy plating layer, a cyanide-free cadmium-iron alloy plating layer and a hexavalent chromium passivation film are sequentially prepared on a high-strength structural steel substrate from inside to outside. The prepared sample piece is subjected to a hydrogen brittleness test according to HB 5067.1-2005 Part 1 of hydrogen brittleness test of plating process: Mechanical Method, and the test result meets the standard requirement; the surface of a plated part is free of white rust after being subjected to an acetate mist test for 400h according to GB / T 10125-2021 Artificial Atmosphere Corrosion Test Salt Spray Test, and a plating layer of the plated part has excellent corrosion resistance; according to GB / T 5270-2005 < GB / T 5270-2005 < GB / T > 5270-2005 < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB /

The invention discloses a nickel and cadmium-containing nonferrous metal wastewater treatment method, and relates to the technical field of wastewater treatment. The preparation method comprises the following steps: by taking polyvinyl alcohol and gelatin as raw materials, carrying out amination modification through 3-amino-trimethoxysilane to prepare an aminated gelatin solution, and then adding a modified metal organic framework adsorption material and modified nitrogen-containing biochar to react to prepare an adsorbent with a good adsorption effect on metal nickel and cadmium. The modified metal organic framework adsorption material and the modified nitrogen-containing biochar have amino groups, so that the modified metal organic framework adsorption material and the modified nitrogen-containing biochar have good dispersibility in the aminated gelatin, and the adsorption effect of the adsorbent is improved.

The tellurium-cadmium-mercury double-layer component heterogeneous planar junction detector comprises a substrate material layer, an n-type absorption layer, a surface n-type wide band gap heterogeneous layer, a passivation layer and a contact electrode layer which are arranged in a stacked mode. The surface n-type wide band gap heterogeneous layer is a wide band gap heterogeneous layer prepared on the surface of the n-type absorption layer based on a mercury-rich vertical liquid phase epitaxy technology, and the residual impurities are n-type; the passivation layer covers at least partial areas of the isolation region and the p-type injection region in the orthographic projection direction, and the part, not covering the p-type injection region, of the passivation layer is a contact hole; the contact electrode layer is in contact with the p-type injection region, and the orthographic projection area of a contact electrode is larger than and covers the contact hole. According to the invention, interface mutual diffusion is realized in the growth process of the n-type wide bandgap heterogeneous layer, and the mercury cadmium telluride p-on-n planar heterojunction device is realized through As ion implantation. Tunneling current and surface electric leakage can be effectively suppressed, dark current can be reduced, and device performance can be improved.

The invention discloses an alkaline cyanide-free cadmium plating process for an ultrahigh-strength steel part. The alkaline cyanide-free cadmium plating process comprises the steps of oil removal, stress elimination, electrolytic oil removal, flowing water washing, weak corrosion, flowing cold water washing, copper pre-plating, flowing cold water washing, alkaline cyanide-free cadmium plating, flowing water washing, hydrogen removal, aftertreatment, drying and inspection. In order to avoid the situation that the metal surface of the workpiece is passivated in a plating tank, the pretreatment process is adopted, a cyanide-free copper electroplating layer is pre-plated on the surface of the workpiece, the surface of the part is adjusted, the surface activity is improved, and then the binding force of a base body and the plated cadmium is improved; according to the method, a stress eliminating process and a long-time hydrogen removing process after plating are adopted before plating, so that the hydrogen embrittlement risk is reduced, the process steps are simple, and the implementation is high.

The invention discloses a method for preparing 6N high-purity zinc, comprising the following steps: S1, alkali dissolution: dissolving electro zinc with sodium hydroxide, filtering after the reaction is completed; S2, acidification: adding hydrochloric acid to the filtered solution for acidification; S3, evaporation concentration: putting the acidified solution into an evaporating kettle for evaporation concentration; S4, freezing crystallization: filtering and drying the concentrated solution after cooling in a freezing tank; S5, secondary dissolution: dissolving the dried zinc chloride solid in an ether solution at room temperature, filtering; S6, vacuum distillation: putting the filtered ether solution into a vacuum distillation device, S7, heating and decomposing; S8, vacuum distillation. This method can achieve the purpose of preparing 6N high-purity zinc from electro zinc, and realize the low-cost recycling of zinc resources; at the same time, the alkali dissolution-acidification-ether secondary dissolution process can be used to effectively separate metals such as cadmium with a segregation coefficient close to 1 in zinc, which is convenient for the rear-end pyrometallurgical method to purify 6N high-purity zinc.

The invention belongs to the technical field of semiconductor material synthesis, and particularly relates to a high-quantum-efficiency and high-stability cadmium selenide quantum sheet and a preparation method thereof.The high-quantum-efficiency and high-stability cadmium selenide quantum sheet is obtained after the cadmium selenide quantum sheet is dispersed in a solvent and a Z-type ligand is added into the solvent; the cadmium selenide quantum sheet is a purified cadmium selenide quantum sheet; the Z-type ligand is cadmium caprylate; the quantum chip has the characteristic of high luminescence, the quantum efficiency of the synthesized quantum chip reaches up to 95%, and compared with the prior art, the quantum efficiency of the prepared quantum chip is higher; the quantum chip has the characteristic of long-term stability, and after the synthesized quantum chip is added into the cadmium caprylate ligand, the luminous intensity can be basically kept unchanged for several months; according to the preparation method, synthesis preparation in air can be achieved, and compared with the operation that synthesis preparation needs to be carried out under nitrogen or argon, the preparation method is simpler, and the cost is saved.

The present invention relates to the technical field of preparation of adsorbent materials for removing heavy metals from acidic wastewater, specifically a method for preparing a resin-based magnetic composite adsorbent material, comprising the following steps: using waste expanded resin as a base carrier, ferric chloride as an added magnetic auxiliary substance, mixing magnesium sulfate and aluminum sulfate evenly, stirring at high speed and ultrasonic dispersion, then adding sodium phosphite and sodium hypophosphite and placing them in a microwave reactor, adjusting the pH of the sodium phosphite and sodium hypophosphite in the reactor to precipitate, while the phosphite intercalates into the precipitate, finally filtering the precipitate and washing and drying to obtain a novel adsorbent material for excellent adsorption of heavy metals in acidic mine wastewater. The material prepared by the present invention can effectively adsorb various heavy metal ions such as cadmium, chromium, zinc, lead, manganese, copper, etc. in acidic mine wastewater, has a large adsorption capacity, and the adsorbent material has magnetism and can be regenerated by solid-liquid separation through magnetism.

The invention relates, inter alia, to a dispersion electrolyte for the electroplating of particle-containing tin alloy layers. The dispersion electrolyte comprises 2 to 100 g / L tin ions; 1 to 100 g / L ions of a second alloying element selected from copper, silver, bismuth, nickel, cobalt, cadmium, zinc, manganese, and combinations thereof; 1 to 200 g / L at least one type of particle selected from inorganic piezoelectric particles, electrically conductive ceramic particles, and combinations thereof; at least one dispersant selected from anionic dispersants, nonionic dispersants, and combinations thereof; and water. The pH value is 7 or lower. The dispersion electrolyte can be used to electroplaten a particle-containing tin alloy layer onto a metallic or metallized substrate.

The invention provides a zinc sulfide material oxidative desulfurization method which comprises the following steps: carrying out primary oxidative desulfurization reaction on a mixed material formed by a zinc sulfide material and a flux and oxygen-enriched gas in an oxidative smelting area of a furnace chamber to obtain a primary oxide material and a copper matte material; the primary oxide material is subjected to a second oxidation desulfurization reaction in an oxidation smelting area to form a high-zinc material and high-cadmium smoke dust; wherein the temperature of the first oxidation desulfurization reaction is t1, and the oxygen-material ratio is OM1; the temperature of the second oxidation desulfurization reaction is t2, and the oxygen-material ratio is OM2; 50 DEG C < = t2-t1 < = 450 DEG C; 50Nm < 3 > / t < = OM2-OM1 < = 400Nm < 3 > / t. The zinc sulfide material does not need complex material preparation and treatment and is directly added into the oxidation smelting area of the zinc smelting furnace, the first oxidation desulfurization reaction and the second oxidation desulfurization reaction are sequentially carried out, and the valuable metal recovery rate of the zinc sulfide material is increased.

The invention discloses a method for controlling the surface shape of a cadmium zinc telluride wafer. The method comprises the following steps: firstly, determining the universal change condition of the thickness and the surface shape of a damaged layer of the cadmium zinc telluride wafer along with a grinding and polishing process under an actual process condition; in combination with an analysis result, before each time of surface treatment of the tellurium-zinc-cadmium wafer, removing damaged layers on the two surfaces of the tellurium-zinc-cadmium wafer through a chemical corrosion method; and meanwhile, the surface shape of the wafer is measured before chemical polishing, and chemical polishing is carried out by adopting different process parameters according to the surface shape condition. A chemical corrosion solution in the process of removing the stress of the damaged layer through chemical corrosion is a corrosion solution with a specific concentration, and the chemical corrosion time is determined by the required removal thickness. A chemical polishing solution in the chemical polishing process is an etchant solution with a specific concentration, the chemical polishing time is determined by a surface shape value of a wafer measured before chemical polishing, and a chemical polishing carrier is a specially designed carrier. The method is simple in process, good in repeatability and controllable in process, can be used for surface shape control of the cadmium zinc telluride substrate, and has batch capacity.

The present invention relates to layered multi-metal-oxide-based magnetic biochar and a preparation method and use thereof. The preparation method includes: S1. mixing biomass and an iron salt solution for impregnation, and then adjusting a first pH value of a solid phase material after solid-liquid separation to obtain pretreated biomass; and S2. pyrolyzing the pretreated biomass to obtain magnetic biochar, then mixing the magnetic biochar with a solution containing at least two metal salts and adjusting a second pH value, and then performing hydrothermal treatment to obtain the layered multi-metal-oxide-based magnetic biochar. The obtained layered multi-metal-oxide-based magnetic biochar has a large specific surface area, magnetic properties, a layered morphology, and strong adsorption capacity, and can be applied to the treatment of arsenic- and cadmium-containing composite contaminated water bodies, and also to arsenic and cadmium passivation in farmland soil, thereby reducing health risks of crops in the food chains, and ensuring food safety.

The present invention provides a soil conditioner and a preparation method and application thereof, belonging to the technical field of soil conditioners. The soil conditioner of the present invention comprises the following raw materials in parts by weight: 70 to 90 parts of modified pig manure biochar, 8 to 15 parts of polyaspartic acid, 5 to 10 parts of potassium titanium oxalate, 1 to 3 parts of ammonium molybdate, 40 to 60 parts of calcium silicate, and 20 to 30 parts of lime. The present invention uses a mixed modifier to modify pig manure biochar, which can greatly reduce the content of cadmium and arsenic in edible parts. In addition, the raw materials in the soil conditioner cooperate with each other to reduce the content of heavy metals in the edible parts to the greatest extent.

The invention relates to the technical field of cadmium element analysis, in particular to a biological available cadmium content determination method for soil detection. According to absorbance distribution of different samples under stable correlation wavelengths and cadmium element concentration difference, the cadmium element influence degree of each stable correlation wavelength is obtained, and high-influence wavelengths are screened out; constructing a univariate regression model by using the absorbance of the cadmium standard solution under each high-influence wavelength and the cadmium element concentration, sequentially screening corresponding optimal variables in the high-influence wavelengths based on an AIC forward selection method, and iteratively adding the optimal variables into an empty model to obtain a final cadmium detection model; and obtaining a variable coefficient of a final cadmium detection model according to the absorbance of different samples and cadmium standard solutions under different high influence wavelengths and the corresponding cadmium element influence degrees. By analyzing the influence degree of cadmium elements of different wavelengths, a proper cadmium detection model is constructed, and the accuracy of effective-state cadmium content determination is improved.

The invention relates to a manganese cadmium sulfur and manganese sulfide heterojunction composite photocatalytic material, which is composed of Mn < 0.7 > Cd < 0.3 > S and MnS. The invention also discloses a preparation method of the manganese-cadmium-sulfur-coated manganese sulfide heterojunction composite photocatalytic material. The preparation method specifically comprises the following steps: preparing the manganese-cadmium-sulfur-coated manganese sulfide heterojunction photocatalytic material through a one-step hydrothermal method; (CH3COO) 2Mn. 4H2O and (CH3COO) 2Cd. 2H2O are added, and the mixture is stirred and dissolved in water; adding the mixture into TAA and stirring for 30 minutes to obtain a fully mixed solution; and carrying out a hydrothermal reaction to obtain the final manganese-cadmium-sulfur-coated manganese sulfide heterojunction photocatalytic material. According to the invention, the photoresponse range is widened through the construction of the heterojunction, the transfer and separation efficiency of photo-induced electron holes is obviously improved, the compounding of photo-induced electron hole pairs is inhibited, and the efficiency of photocatalytic uranium reduction is improved.

The invention relates to the technical field of agriculture, in particular to a preparation method and an application method of a zinc-rich cadmium-reducing yield-increasing foliar fertilizer. The specific technical scheme is as follows: the zinc-rich cadmium-reducing yield-increasing foliar fertilizer is prepared from the following components in percentage by mass: 20 to 30 percent of porous chitosan, 30 to 40 percent of L-malic acid and 40 to 50 percent of nano zinc oxide. The technical problem that in the prior art, the zinc content of rice cannot be increased, meanwhile, the rice yield cannot be increased, and the cadmium content of rice cannot be reduced is solved.

The invention discloses a zinc sulfate solution impurity removal method based on a three-section countercurrent purification process, and belongs to the technical field of hydrometallurgy. Heating the zinc sulfate solution containing impurities to 60-70 DEG C in a first-section reaction tank, reacting for 30-60 minutes, adding the second-section pressure filter residue, and performing pressure filtration to obtain a first-section purified solution and a first-section pressure filter residue; the first-section purified liquid is transferred into a second-section reaction tank, zinc powder and third-section filter residues are added, the adding amount of the zinc powder is 0.8-2 times of the theoretical amount of the zinc powder needed for metal cadmium replacement, the temperature is increased to 70-80 DEG C, a reaction is conducted for 60-90 min, and second-section purified liquid and second-section filter residues are obtained after filter pressing; the second-section purified liquid is transferred into a third-section reaction tank, zinc powder is supplemented, the adding amount is 180-300 times of the theoretical amount of the zinc powder needed for metal cobalt replacement, the temperature is increased to 80-90 DEG C, a reaction is conducted for 90-120 min, and third-section purified liquid and third-section filter pressing residues are obtained after filter pressing; and returning the third-section press-filter residue to the second-section reaction tank, returning the second-section press-filter residue to the first-section reaction tank, and reversely recycling. The method has the advantages of sufficient reaction kinetics, high utilization rate of zinc powder, low zinc content in purified slag, simple process, deep impurity removal, low consumption and high efficiency.

The invention discloses a sodium alginate embedded iron-carbon microcapsule material for repairing cadmium and arsenic polluted soil and a preparation method of the sodium alginate embedded iron-carbon microcapsule material, and belongs to the technical field of soil heavy metal pollution repairing materials. The material comprises straw biochar, high-iron steel slag powder, a sulfydryl acetylated chitosan-iron monatomic cluster compound, a boron-doped graphitized carbon coated cobalt ferrite nanosheet, sodium alginate, calcium chloride and sodium carbonate. Wherein the sulfydryl acetylated chitosan is prepared by reacting chitosan with sulfydryl acetic anhydride, dialyzing and drying, and performing solvothermal reaction with ferric nitrate under high pressure. The preparation method comprises the following steps: pyrolyzing and drying the straw biochar, reacting the high-iron steel slag with sulfuric acid, adding the biochar, adjusting the pH value, adding sodium carbonate, mixing to obtain an iron-carbon-based passivation material, mixing with two modified compounds, mixing with a sodium alginate solution, dropwise adding a calcium chloride solution, and stirring and curing. The material can be applied to remediation of cadmium and arsenic polluted soil.

The invention belongs to the technical field of heavy metal treatment, and particularly relates to a synthesis method and application of a sludge biochar Schwertmannite composite material capable of synchronously mineralizing cadmium and arsenic. Municipal or industrial sludge is used as a raw material, sludge biochar rich in Ca, Fe and alkaline functional groups is prepared through pyrolysis, then the sludge biochar is deeply compounded with Schwertmannite through a high-energy ball milling technology, a core-shell-like nested structure is formed through induction, and a large number of reaction sites are exposed. Under the condition that As / Cd coexists, the surface of the composite material can be induced to generate stable minerals, a synchronous precipitation mechanism is formed, and As and Cd have an adsorption synergistic enhancement effect. The process is wide in raw material source, clean and efficient in preparation process and free of high-temperature hydrothermal or organic reagents, has cation exchangeability, alkali energy storage and carbon immobilization value, provides a new theory and material support for long-term environment immobilization of multi-metal pollutants, and has large-scale application potential.

The invention provides a corticiaceaessp.ZJ 06 and application of the corticiaceaessp.ZJ 06 in heavy metal pollution remediation, the name of the corticiaceaessp.ZJ 06 is Corticiaceaessp.ZJ 06, and the preservation number of the corticiaceaessp.ZJ 06 is GDMCC NO: 65302. The strain can effectively passivate cadmium and lead in soil, the effective state of cadmium is reduced by 46.3%, and the effective state of lead is reduced by 42.2%; the soil conditioner has good nitrogen fixation and phosphate solubilizing capabilities, Cd and Pb in available forms of heavy metals in the soil can be effectively converted into forms difficult to utilize, and the conversion rates of cadmium and lead are respectively increased by 22.6% and 22.0%; the cadmium removal rate in the cadmium-lead combined polluted water body reaches 52.4%, the lead removal rate reaches 84.7%, and the method can be used for heavy metal remediation of soil or water bodies and is an in-situ efficient and green remediation method.

The invention provides a photocatalyst based on sulfide homogeneous heterojunction and a preparation method and application thereof, and belongs to the technical field of photocatalysts. The photocatalyst based on the sulfide homogeneous heterojunction provided by the invention is a heterojunction formed by twin-crystal sulfur-cadmium-manganese and transition metal sulfide, has excellent structural stability, and can provide more photo-induced electrons. Therefore, when the photocatalyst provided by the invention is used for degrading H2S to produce hydrogen, the Schottky junction of the photocatalyst can reduce the hydrogen production overpotential, H2S is effectively decomposed to produce hydrogen, and meanwhile, a product Na2S2O3 with a high additional value is produced. The result of the embodiment shows that the photocatalyst based on the sulfide homogeneous heterojunction has excellent catalytic activity when being used for degrading H2S to produce hydrogen.

The invention discloses a process for comprehensively utilizing sintering machine head ash, which comprises the following steps of: preparing the sintering machine head ash, oxidizing and leaching, carrying out filter pressing, and washing chlorine and dehydrating a filter cake to obtain fine iron powder; the method comprises the following steps: preparing metal cesium by replacing and recovering valuable metal from filtrate, performing primary heavy metal removal, performing secondary impurity removal, performing evaporative crystallization, crystallizing potassium chloride and sodium chloride, extracting cesium, concentrating and crystallizing a cesium chloride solution, preparing metal cesium, extracting rubidium from cesium extraction raffinate, and concentrating and crystallizing a rubidium chloride solution, thereby preparing metal rubidium; after the metal replacement powder is dissolved by a certain concentration of acid, copper, zinc, gold, silver and bismuth in the metal replacement powder are recovered step by step, and toxic and harmful elements such as thallium, chromium and cadmium are concentrated from a system. The method can comprehensively and efficiently recover sylvite, sodium salt and valuable metal in the sintering machine head dedusting ash, solves the problem that the normal production of a blast furnace is influenced by overhigh alkali metal content accumulation, and solves the environmental pollution caused by machine head ash stacking and burning.

The invention discloses a double-vacancy ZnCdS solid solution photocatalyst and a preparation method and application thereof.The preparation method comprises the steps that a cadmium source, a zinc source and a sulfur source are added into absolute ethyl alcohol to be stirred and dissolved, the mass ratio of the cadmium source to the zinc source to the sulfur source is 1: 9: 3, a reaction is conducted under the water bath condition of 70-90 DEG C, suction filtration, washing and drying are conducted, and a powdery ZnCdS solid solution is obtained; the preparation method comprises the following steps: adding NaOH into water, stirring and dissolving, then adding the powdery ZnCdS solid solution, carrying out ultrasonic treatment, and carrying out suction filtration, washing and drying to obtain the double-vacancy ZnCdS solid solution photocatalyst. The preparation method has the advantages of being high in hydrogen production rate, good in repeatability and stability, simple and convenient to prepare, low in cost and the like, the obtained double-vacancy ZnCdS solid solution photocatalyst can be applied to the field of photocatalytic hydrogen production, and the hydrogen production efficiency reaches up to 12.69 mmol.g <-1 >. H <-1 > and is 23.94 times that of pure ZnS and 11.64 times that of pure CdS.

The invention relates to the technical field of biomass-based semiconductor bifunctional materials and environmental restoration, in particular to a Baijiu vinasse biochar / cerium oxide / cadmium zinc sulfur solid solution heterojunction bifunctional material as well as a preparation method and application of the Baijiu vinasse biochar / cerium oxide / cadmium zinc sulfur solid solution heterojunction bifunctional material. The method comprises the following steps: in an inert atmosphere, carrying out pyrolysis on waste Baijiu vinasse to obtain biochar; the method comprises the following steps: mixing biochar and an activator, and carrying out activation pyrolysis in an inert atmosphere to obtain alkali-activated biochar; the preparation method comprises the following steps: dispersing a cadmium source, a zinc source, thiourea, a surfactant, alkali-activated charcoal and cerium dioxide in a solvent to form a dispersion liquid, and carrying out a heating reaction to obtain the Baijiu vinasse charcoal / cerium oxide / cadmium-zinc-sulfur solid solution heterojunction bifunctional material. The adsorption performance of the material is improved due to the remarkable specific surface area of the alkali-activated biochar component; the construction of the cerium oxide / cadmium zinc sulfur solid solution heterojunction significantly accelerates the migration of photon-generated carriers, endows the material with excellent adsorption-photocatalytic performance, has good reusability, and can remove pesticide pollutants in water.

The invention belongs to the technical field of heavy metal pollution treatment, and relates to preparation of a weakly alkaline soil cadmium passivator and a method for passivating soil lead. The alkalescent soil cadmium passivating agent mainly comprises the following components in parts by weight: 20 to 30 parts of graphene oxide modified biochar, 5 to 10 parts of montmorillonite, 5 to 10 parts of bentonite and 5 to 10 parts of a microbial agent, the microbial agent is a composite microbial agent formed by mixing bacillus subtilis, bacillus amyloliquefaciens, bacillus thuringiensis and pseudomonas nitroreducens. The alkalescent soil cadmium passivator has a very good remediation effect on cadmium and lead in polluted soil, can remarkably improve the physicochemical properties of the cadmium and / or lead polluted soil, increase the content of organic matters in the soil, reduce the migration of the soil in the environment and reduce the content of cadmium in crops, and has a great market popularization value.