9 results about "Sulfide ions" patented technology

To provide a new method for producing quantum dots of an iron-containing sulfide different from a conventional one.SOLUTION: A method for producing quantum dots of an iron-containing sulfide includes a step of preparing a mixed solution in which at least ferrous hydroxide is present in water at 0 °C or higher and 30 °C or lower, a step of preparing a green rust-containing suspension by oxidizing the mixed solution to form green rust crystals in the mixed solution, and a step of raising the temperature of the suspension to 50 °C or higher and 100 °C or lower in an oxygen-free stream. A method for producing iron-containing sulfide quantum dots, the method comprising: synthesizing the ferrite quantum dots in the slurry; collecting the ferrite quantum dots in the slurry; and treating the ferrite quantum dots with hydrogen sulfide gas at 110 °C. or more and 150 °C. or less to substitute sulfide ions O2 - for oxide ions S2 - in the ferrite, thereby producing iron-containing sulfide quantum dots.SELECTED DRAWING: Figure 1

The present invention provides a method for the resource utilization of sulfur-containing wastewater based on the tandem oxidation of electrochemistry and chemistry, belonging to the technical fields of sulfur-containing wastewater treatment and resource utilization, as well as electrochemically hydrogen evolution technology. This method uses wastewater rich in high-concentration sulfide ions as a substrate, and adopts an electrochemical oxidation method to electrocatalytically oxidize it to polysulfide at the anodic end, coupling with the hydrogen evolution reaction to produce high-purity hydrogen at the cathode; at the same time, a sodium ion exchange membrane is used to achieve alkali recovery at the cathode, and a two-electrode system for low-energy-consuming sulfur ion oxidation-assisted electrolytic hydrogen production is constructed. Further, the sodium polysulfide solution obtained at the anode is catalytically oxidized and filtered and crystallized by using a metal sulfide powder catalytic material to prepare sodium thiosulfate, obtaining a high-value-added product. The present invention adopts the electrochemistry + chemistry tandem method to simultaneously realize the treatment of sulfur-containing waste liquid and the production of high-value-added substances, which is a new solution combining environmental governance and clean energy hydrogen production, and has important significance and application prospects.

The invention discloses a method for removing trivalent and pentavalent arsenic in sewage by generating iron and manganese sulfide in situ, which belongs to a sewage treatment technology, and is characterized by comprising the following operation steps: (1) adding soluble divalent manganese salt, soluble ferrous salt, sulfur ions and phosphate into a reactor containing sewage to be treated containing trivalent arsenic and pentavalent arsenic, and uniformly mixing; (2) stirring the reaction system to promote the production of the nano-state iron-manganese-sulfur composite colloid material and promote the generated nano-state iron-manganese-sulfur composite colloid material to form precipitates with trivalent arsenic and pentavalent arsenic ions; (3) carrying out solid-liquid separation on the precipitate, wherein supernate is sewage without arsenic element; the technology is simple in technological process, low in cost, good in arsenic removal effect and obvious in advantages in practical application, and has wide application prospects.

This invention provides a method for detecting the chemical oxygen demand (COD) of a water sample containing interfering ions. The method includes: testing the content of various interfering ions in the water sample, wherein the interfering ions include one or more combinations of bromide ions, iodide ions, chloride ions, and sulfide ions; ensuring that the chloride ion concentration in the water sample is below the concentration that the masking agent used for COD detection can block; performing COD detection on the water sample to obtain the actual apparent COD value; and calculating the total interference value y of other interfering ions besides chloride ions in the water sample. 总 The measured apparent value of COD was subtracted from the total interference value y. 总 The method provided by this invention can eliminate the interference of bromine, iodine, chloride, and sulfur ions in water samples on COD detection, and has high detection accuracy and good repeatability. It solves the problem of high detection values ​​and distorted results caused by the reaction of reducing ions with the digestion system in COD detection.

The invention relates to a synthesis method of a novel dual-wavelength off-on fluorescent molecular probe for identifying and detecting hypochlorite and application of the fluorescent probe in detection of hypochlorite. The structure of the fluorescent probe is as shown in a formula I. The fluorescent molecular probe disclosed by the invention is prepared by taking a water sample azine as a raw material and reacting with dimethylaminoformyl chloride. The synthesis method of the probe is simple, reaction conditions are mild, and the yield of the target compound is high. The fluorescent molecular probe is stable in optical performance, high in hypochlorite detection sensitivity and low in lower detection limit, the detection limit is 0.37 mu M, and the response range is 50-180 mu M. The selectivity is good, and no response is caused to fluorine ions, iodide ions, perchlorate ions, hydrogen sulfate ions, sulfate ions, acetate ions, thiocyanate ions, sulfur ions and the like. The fluorescent molecular probe provided by the invention has practical application value in the fields of biochemistry and environmental chemistry, especially detection of hypochlorite ions in water and the like.

This application relates to the field of acidic mine wastewater treatment and sulfide resource recovery technology, specifically providing a method and system for hydrogen-driven synergistic biological treatment of acidic mine wastewater and sulfide resource recovery. The method includes: introducing acidic mine wastewater into an HSR-MBR unit; under anaerobic conditions with hydrogen as the sole external electron donor, reducing sulfate to sulfide ions and generating alkalinity through hydrogen autotrophic sulfate-reducing bacteria; and the sulfide ions reacting with Fe... 3+ The biofilm reacts with other heavy metal ions to form insoluble heavy metal sulfide particles; these particles are periodically sludged off the biofilm; the treated mixture is then introduced into a solid-liquid separation unit for membrane separation to obtain purified effluent and sulfide-containing biomass retained by the membrane; all biomass rich in heavy metal sulfides is collected for resource recovery. This application achieves integrated treatment of acidic mine wastewater through "co-removal of pollutants and targeted conversion of resources" within a single system.

The present invention provides a hemicyanin probe compound, and establishes a detection method for sulfite ions and sulfide ions in a solution under ultraviolet-visible and fluorescence conditions using a probe molecule. Common anions are added to a C2H5OH-Hepes buffer solution, and only sulfite and sulfide ions change. Sulfite ions can cause the solution to fade, the fluorescence intensity of the solution to weaken, and the anti-interference performance is good; sulfide ions can cause the solution color to deepen, the fluorescence intensity of the solution to increase, and the anti-interference performance is good. At the same time, taking the amount of sulfur dioxide residue in sulfur-fumigated Chinese medicinal materials as the detection target, the sulfur-fumigated Chinese medicinal materials are treated under alkaline conditions, and ultra-sensitive rapid detection of sulfur-fumigated Chinese medicinal materials is achieved through a standard curve method. The hemicyanin probe compound has the advantages of fast analysis speed, stable fluorescence performance, and real-time detection for the determination of the content of sulfur dioxide residues in Chinese medicinal materials, and has the value of promotion and use in the detection of sulfur dioxide residues in the fields of traditional Chinese medicine and food.

Provided is a method for producing quantum dots of an iron-containing sulfide, the method being characterized by having: a step for preparing a mixed solution in which at least ferrous hydroxide is present in 0-30°C water; a step for preparing a green rust-containing suspension by oxidizing the mixed solution to form green rust crystals in the mixed solution; a step for synthetizing quantum dots of the ferrite in the suspension by raising the temperature of the suspension to 50-100°C in an oxygen-free gas flow; a step for recovering the quantum dots of the ferrite in the suspension; and a step for treating the quantum dots of the ferrite with hydrogen sulfide gas at 110-150°C, thereby substituting the oxygen ions O2− of the ferrite with sulfide ions S2− and preparing quantum dots of an iron-containing sulfide.

The invention relates to the technical field of waste liquid treatment, in particular to a continuous process method for deeply removing lead from a rare earth chloride solution. The method solves the problems of hydrogen sulfide escape, sulfur ion residue, discontinuous process and the like in the traditional sulfide precipitation method. The method comprises the following steps: adjusting the pH value of a solution to remove thorium, and enabling the solution to sequentially pass through a first fixed bed reaction column filled with a surface activated porous reduced iron filler and a second trapping and polishing column filled with magnetic iron oxide trapping particles and titanium dioxide coating polishing particles under an anoxic condition to realize reduction precipitation and deep removal of lead; then, barium salt precipitation is used for removing radium, and cerium hydroxide wet glue is used for adsorbing co-precipitated residual radioactive elements; the process does not need to introduce sulfides, can realize whole-process continuous operation, and has the advantages of radioactive purification, high rare earth recovery rate and good process stability.