81 results about "Sulfide ions" patented technology

Methods and systems for separating hydrogen and sulfur from hydrogen sulfide(H₂S) gas. Hydrogen sulfide(H₂S) gas is passed into a scrubber and filtration unit with polysulfide solution. Interaction frees elemental sulfur which is filtered, excess continues to a stripper unit where the excess H₂S is removed. The excess H₂S returns to the scrubber and filtration unit, while the sulfide solution passes into a photoreactor containing a photocatalyst and a light source. The sulfide solution is oxidatively converted to elemental sulfur and complexed with excess sulfide ion to make polysulfide ion, while water is reduced to hydrogen. Hydrogen is released, while the polysulfide solution is fed back to the scrubber unit where the system operation repeats. In a second embodiment, the photocatalyst is eliminated, and the hydrogen sulfide solution is directly illuminated with ultraviolet radiation with a light source such as a low pressure mercury lamp operating at approximately 254 nm.

A calcium-sodium polysulfide chemical reagent and methods for producing the reagent. The reagent is a blend of calcium polysulfide and sodium polysulfide that can be prepared using various types, sources and ratios of lime, elemental sulfur and sulfide ion using either virgin or waste materials. The reagent is amenable to inexpensive and high rate production methods at ambient or warmer temperatures. The reagent can be used to precipitate metals from wastewater, stabilize hexavalent chrome in hazardous waste residues, remove mercury from coal fired power plants, and as an electrolyte in large-scale bromide/polysulfide electrical storage batteries

Acidic metal-bearing wastewaters are treated to produce a finished water of sufficient purity to meet discharge standards while recovering metals removed in forms which are commercially valuable. The metals are selectively precipitated, either in a batch or in a continuous system, for removal of individual metal products in a specific sequence of steps from the wastewater. In each step, the pH is adjusted to the specific pH range and sulfide ion is introduced to precipitate the metals, excepting the removal of ferric iron and aluminum which is achieved using hydroxide precipitation. Bioconversion process using unique equipment converts sulfate in the wastewater to the hydrogen sulfide gas required for the precipitation process. This bioconversion process reduces the sulfate in the wastewater so that the water can be directly discharged or used for agricultural applications.

The invention discloses a three-dimensional flower-shaped In ₂ S ₃ /In ₂ o ₃ A composite microsphere photocatalytic material and a preparation method thereof belong to the field of pollution control and technology. Using thioacetamide as the sulfur source, the In ₂ o ₃ The lattice oxygen in is replaced by sulfide ions, and in the flower-like In ₂ o ₃ In situ generation of In on the surface ₂ S ₃ nanosheets, forming a heterojunction structure; three-dimensional flower-like In ₂ o ₃ The shape is uniform, the particle size is 3.0–6.5μm, In ₂ S ₃ Nanosheets wrapped in In ₂ o ₃ The surface of micron flowers. The raw materials used in the invention are cheap and easy to obtain, the reaction conditions are easy to control, and the requirement for equipment is low, which is an environment-friendly preparation method. In ₂ S ₃ /In ₂ o ₃ Composite microspheres not only improve the In ₂ o ₃ The utilization rate of visible light and the suppression of the recombination of photogenerated carriers have good application value and prospects in the field of photocatalytic degradation of volatile organic pollutants.

The present invention provides a process for treating water that comprises chloride ions, other ions (e.g., ferrous ions, sulfide ions, or sulfite ions) and microorganisms.

A method and apparatus for reducing and removing mercury in industrial gases, such as a flue gas, produced by the combustion of fossil fuels, such as coal, adds sulfide ions to the flue gas as it passes through a scrubber. Ideally, the source of these sulfide ions may include at least one of: sulfidic waste water, kraft caustic liquor, kraft carbonate liquor, potassium sulfide, sodium sulfide, and thioacetamide. The sulfide ion source is introduced into the scrubbing liquor as an aqueous sulfide species. The scrubber may be either a wet or dry scrubber for flue gas desulfurization systems.

The invention discloses a new method for on-site synthesis of a lithium ion conductive protection film for preventing poly-sulfide-ions diffusion on a surface of a lithium sulfur battery positive electrode, and an application therefor. The method is carried out by the steps of reducing the initial discharge voltage lower limit of a lithium sulfur battery taking a carbon sulfur composite as the positive electrode material to be lower than the normal working voltage 1.5V to generate the lithium ion conductive protection film; the film is quite high in the lithium ion conductivity and capable of preventing the poly-sulfide-ions from being dissolved in an electrolyte to enable the lithium sulfur battery to realize and maintain higher cycle performance, rate capability, coulombic efficiency and lower self discharge performance, so that the service life of the lithium sulfur battery is prolonged, and the use cost of the lithium sulfur battery is reduced; meanwhile, porous carbon with hierarchical pores used as the supporting material can accommodate the poly-sulfide-ions and lithium sulfide generated in charging and discharging processes of sulphur and the lithium sulfur battery; and the sulphur content in the carbon-sulfur composite material made from the porous carbon with the hierarchical pores is high, so that the comprehensive specific capacity of the carbon-sulfur composite product can be improved so as to further increase the overall energy density of the battery.

A product and method for the removal of pollutant heavy metals from aqueous solutions which precludes the end user from storing, handling, feeding and controlling hazardous soluble sulfide materials. The product is a slurry which includes a mixture of a liquid medium and an essentially insoluble salt wherein the salt is the reaction product of heavy metal ions, preferably selected from Mn⁺⁺ ions, Fe⁺⁺ ions, and Fe⁺⁺⁺ ions, and sulfide ions derived from soluble sulfide sources such as sodium sulfide, hydrogen sulfide, and sodium hydrosulfide. Addition of the subject slurry to a wastewater stream will effect the precipitation of heavy metals with lesser equilibrium sulfide ion concentrations than that of the essentially insoluble salt. Solids collected by this method may be returned to subsequent wastewater streams for additional removal of heavy metals by any excess heavy metal sulfide salt.

The present invention relates to a composite depressant for inhibiting the flotation of copper sulfide minerals. Sodium acetate 20% ~ 80%; The preparation method is: According to the above ratio, under normal temperature and pressure, stir and mix evenly at a speed of 300 ~ 1000rad/min to obtain a compound inhibitor. The present invention overcomes (1) the environmental pollution caused by the application of cyanide; (2) the large amount of sodium sulfide used, the high expense of the medicament, and the poor economic benefit; Activation of sulfide ions on chalcopyrite, pyrite, etc. The compound depressant has improved inhibition effect and inhibition effect, and has the characteristics of wide source of raw materials, easy preparation, low processing cost, stable flotation performance, relatively low price and easy popularization.

The invention discloses a technology for synthesizing sulfur quantum dots through an oil-water interface method. The technology comprises the following steps: 1, preparing metal sulfide quantum dots; 2, preparing a nitric acid solution; and 3, preparing sulfide quantum dots. In the invention, oleic acid is used as a solvent to prepare oil-soluble metal sulfide quantum dots, an n-hexane solution of a metal sulfide and an aqueous solution of nitric acid are mixed as an oil phase and a water phase respectively, nitric acid oxidizes sulfide ions into elemental sulfur in situ at the phase interface, and the metal sulfide quantum dots are adopted as a template to realize the uniform distribution of the particle sizes of the prepared sulfur quantum dots, so the oil-water interface alleviates the reaction speed and realizes the dispersion and small particle sizes of sulfur nano-particles. The technology allows the sulfur quantum dots to be synthesized by adopting the above technical scheme through the oil-water interface reaction with the n-hexane solution of the metal sulfide as the oil phase and the aqueous solution of nitric acid as the water phase, so the technology has the advantages of mild reaction conditions, simple operation, controllable particle size and easy popularization.

A method and system for separating hydrogen and sulfur from hydrogen sulfide (H.sub.2S) gas being produced from oil and gas waste streams. The hydrogen sulfide (H.sub.2S) gas is first passed into a scrubber and filtration unit where it encounters polysufide solution. Elemental sulfur is freed when the H.sub.2S interacts with the solution, the sulfur is filtered through a porous media such as a ceramic frit, and continues to a stripper unit where the excess H.sub.2S is removed from the sulfide solution. The excess H.sub.2S returns to the scrubber and filtration unit, while the sulfide solution passes into a photoreactor containing a semiconductor photocatalyst such as Cadmium Sulfide (CdS), Platinized Cadmium Sulfide, Pt--CdS, Zinc Sulfide, ZnS, Zinc Ferrate, ZnFe.sub.2O.sub.4, Indium Sulfide, In.sub.2S.sub.3, along with a 450-500 nm light source. The sulfide solution inside the photoreactor consisting mainly of bisulfide ion, is oxidatively converted to elemental sulfur and then complexed with excess sulfide ion to make polysulfide ion, while water is reduced to make hydrogen under the action of the light source. Hydrogen percolates out of the photoreactor, while the polysulfide solution is fed back to the scrubber unit where the system operation starts over again for additional hydrogen sulfide gas.

A noble metal sulfide catalyst obtained by reaction of a precursor of at least one noble metal with a thionic species in an aqueous environment essentially free of sulfide ions useful as an electrocatalyst in the depolarized electrolysis of hydrochloric acid.

A testing kit and method of testing for the presence of lead mercury and chromate in surface coatings is provided that can accurately determine the presence of lead, mercury and chromate in the surface coating without interference from other constituents of the surface coating. The kit includes an alkaline caustic that is utilized to dissolve the coating material to enable any lead or mercury present in the coating material to react with a subsequently added second solution containing sulfide ions, while preventing interference of other ionic species with the interaction of the lead and sulfide. The sulfide ions can then react with the lead or mercury in order to produce a dark color for the resulting solution. The resulting color can then be compared against a color standard to determine the amount of lead or mercury present in the sample. The kit and method also enables a determination for the presence of chromate by dissolving the coating material in the alkaline solution and observing the development of a characteristic pale yellow color.

An electroplating solution includes an aqueous electrolyte solution including water soluble copper salts, sulfide ions and chloride ions, an accelerator including an organic material having sulfur (S), the accelerator accelerating copper (Cu) reduction, a suppressor including a polyether compound, the suppressor selectively suppressing the copper reduction, and a leveler including a water soluble polymer having nitrogen that is dissolved into positive ions in the aqueous electrolyte solution.

The invention discloses a determination method for total sulfur in water quality. The method includes the following four steps: while sulfurous gas which can leak out is fixed by calcium oxide, potassium permanganate oxidation, nitric acid oxidation, hydrochloric acid regulation and barium chromate spectrophotometry are used for determining sulfate radical, which is converted into sulfur content. During total sulfur determination in water sample, calcium oxide and potassium permanganate are first added to oxidate sulfide ions under alkaline condition, sulfur in other valence states is then oxidated or decomposed into the sulfate radical under the joint oxidation of potassium permanganate and nitric acid, hydrochloric acid solution is then added to regulate the water sample and remove the color of the potassium permanganate, finally, the sulfate radical content in water quality is determined by barium chromate spectrophotometry, and total sulfur content is worked out. According to the characteristics of the sulfur in different valence states in water quality, by fixation, oxidation and decomposition, the method finally converts the sulfur in all valence states into the sulfate radical, and utilizes barium chromate spectrophotometry to determine the sulfate radical, and thereby the total sulfur in water quality is determined. Determination is simple, the result is accurate, and the method can be applied in fields such as environment protection and monitoring, food monitoring and sulfur balance analysis.

The various embodiments herein provide a method of preparation of a nano-material for dechlorination of polychlorobiphenyls (PCB) from oil. The method involves preparing a modified bentonite prepared by treating with hexadecyl pyridinium bromide surfactant and dispersing the modified bentonite in cyclohexane. Aqueous solutions of metal ion such as Cadmium Nitrate or Zinc Nitrate and sulfide ions such as sodium sulfide are added alternately to obtain metal sulphide nano-particles. zinc nitrate is more preferable. The method of dechlorination of polychlorobiphenyls from oil involves irradiating a mixture of oil, nano-material and a solvent such as toluene under UV light for 2-6 h. A nano-material including a modified bentonite with a mono-layer of surfactant and metal sulphide nano-particles such as ZnS and CdS for remediation of oil containing PCB, is also provided.

The invention relates to a deposition method of a multi-section camium sulfide thin film, comprising the following steps of: 1, placing a substrate containing a light-absorbing layer in first chemical bath solution with sulfide ions, cadmium ions and high bath temperature for depositing a first camium sulfide film on the light-absorbing layer of the substrate; and 2. placing the substrate into second chemical bath solution with sulfide ions, cadmium ions and low temperature for depositing a second camium sulfide film on the first camium sulfide film, wherein the temperature difference between the first chemical bath solution and the second chemical bath solution is above 10DEG C.

Methods and apparatus relate to catalysts and preparation of the catalysts, which are defined by sulfides of a transition metal, such as one of molybdenum, tungsten, and vanadium. Precursors for the catalysts include a metal ion source compound, such as molybdenum trioxide, and a sulfide ion source compound, such as thioacetamide. Once the precursors are dissolved if solid and combined in a mixture, homogenous precipitation from the mixture forms the catalysts. Exemplary uses of the catalysts include packing for a methanation reactor that converts carbon monoxide and hydrogen into methane.

The invention relates to a tellurium dioxide purification method which comprises the following steps: 1, performing alkaline leaching; 2, neutralizing, 3, washing with water; and 4, drying, wherein an impurity removal agent A is added in the alkaline leaching process, and an impurity removal agent B is added in the neutralizing process of an alkaline leaching filtrate; the impurity removal agent A added in the alkaline leaching process is ferrous sulfate heptahydrate, and the impurity removal agent B added in the neutralizing process is EDTA (ethylene diamine tetraacetic acid) complexing agent; and a small amount of sodium sulfide is added in the alkaline leaching process to remove lead in the solution to ensure that no free sulfide ions exist in the solution. A precipitating impurity removal method, a complexing impurity removal method and a washing impurity removal method are organically combined, so that the content of impurity elements (such as selenium, lead, bismuth, copper, arsenium, stibium, tin, iron and the like) in the tellurium dioxide product can be directly and effectively lowered, the main components of the tellurium dioxide product are increased, the content of the main components of the tellurium dioxide product obtained after the processing steps is higher than 99.9%, and the whiteness is favorable.

The invention provides a method for detecting sulfide in sewage. The method for detecting the sulfide in the sewage comprises the following steps that stabilizer and buffered solution are sequentially added in a water sample to be detected, pH of the water sample is adjusted to be 10.2-11.8, under magnetic stirring, a sulfide-ion-selective electrode and a reference electrode are adopted, standard zinc ion solution with 0.01mol/L concentration is used for titrating sulfide ions, a voltmeter is used for measuring electric potential change, positions before and after an equivalent point where abrupt changes occur in the electric potential are reaction endpoints, a second-order differential method is used for calculating the use level of the standard solution, and therefore sulfide ion content is calculated. According to the method for detecting the sulfide in the sewage, a sulfide-ion-selective electrode potentiometric titration mode is used for measuring the sulfide in the sewage, complex pretreatment for the water sample is unnecessary, and the measurement is not affected by ingredients, color and turbidity of the water sample, and the method for detecting the sulfide in the sewage is easy and convenient to operate, fast to analyze, accurate in results, good in effects of the adopted stabilizer, the buffered solution and titrating solution, and free of environmental damage.

A process for treating industrial waste water containing hexavalent chromium (Cr+6) and other heavy metals is disclosed which comprises reduction of Cr+6 to trivalent chromium (Cr+3) and the precipitation thereof with other heavy metals by addition of sulfide ion and ferrous ion to the waste stream at a pH of about 7 to 9 under conditions such that sludge production by the process of the invention is substantially less than that characteristic of prior art processes. Polymers are added to the solution to assist flocculation and clarification of the waste stream. More specifically, the invention comprises adding sulfide ion in a sulfide to hexavalent chromium ratio of about 0.7-2.5:1 and adding ferrous ion in a ferrous to hexavalent chromium ratio of about 0.5-5.0:1. The waste stream pH is preferably maintained in the range of about 7.2 to 7.5.