Showing papers on "Sodium sulfide published in 2008"
TL;DR: In this paper, a hybrid photocatalytic system based on a mixed-phase cadmium sulfide matrix composed of nanoparticulate cubic-phase CdS (c-CdS) with average particle diameters of 13 nm and a bandgap energy of 2.6 eV was proposed.
Abstract: A hybrid photocatalytic system, which is based on a mixed-phase cadmium sulfide matrix composed of nanoparticulate cubic-phase CdS (c-CdS) with average particle diameters of 13 nm and a bandgap energy of 2.6 eV, is coupled with bulk-phase hexagonal CdS (hex-CdS) that has a bandgap energy of 2.3 eV and is interlinked with elemental platinum deposits. The resulting hybrid nanocomposite catalysts are photocatalytically efficient with respect to hydrogen gas production from water with visible light irradiation at λ > 420 nm. Rates of H2 production approaching 1.0 mmol-H2 g−1 h−1 are obtained with a c-CdS/Pt/hex-CdS composite photocatalyst, in the presence of a mixed sodium sulfide and sodium sulfite background electrolyte system at pH 14. In contrast, the same composite produces H2 a rate of 0.15 mmol g−1 h−1 at pH 7 in a water-isopropanol solvent system. The relative order of reactivity for the synthesized hybrid catalysts was found to be c-CdS/Pt/hex-CdS > Pt/c-CdS/hex-CdS > Pt/hex-CdS > hex-CdS > c-CdS/hex...
192 citations
TL;DR: The discharge properties of a Na/Ni 3 S 2 cell using 1 M NaCF 3 SO 3 in tetra(ethylene glycol)dimethyl ether liquid electrolyte were investigated at room temperature as mentioned in this paper.
111 citations
TL;DR: In this paper, the rate data per unit surface area of gold, silver, and gold-silver alloys based on electrochemical or chemical dissolution of rotating discs or foils of constant surface area in aerated cyanide solutions at ambient temperatures are analysed on the basis of the Levich equation.
74 citations
TL;DR: The statistical analysis showed that the amount of cells produced and efficiency in CO conversion were not affected by Sodium sulfide concentration, however, sodium sulfide is required as it does influence the acetic acid production.
72 citations
TL;DR: Proposing a new packing material able to provide the lacking nutrients and oxygen consumption measurements in liquid experiments show that these packing materials could enhance bacterial growth compared to pine bark or pozzolan and have no inhibitory effect.
68 citations
TL;DR: For the preparation of amino acid chelated fertilizer, chicken feathers were hydrolyzed with sulfuric acid (H2SO4; 6M) and potassium hydroxide (KOH, 6M), separately in the presence of different catalysts as mentioned in this paper.
Abstract: For the preparation of amino acid chelated fertilizer, chicken feathers were hydrolyzed with sulfuric acid (H2SO4; 6M) and potassium hydroxide (KOH; 6M) separately in the presence of different catalysts. Under acidic conditions, the catalyst zinc sulfate, gave minimum ammonium but a maximum conversion rate of organic nitrogen (N) into amino acids (19% higher than control). Under alkaline conditions, sodium sulfide showed maximum amino acid-N and conversion rate (37% higher than control). The catalyst doses showed a continuous increase in the conversion rate and were highest at 12%. The ratio of 1:3 feathers: hydrolytic agent showed maximum conversion rate. Hydrolytic time had a nonsignificant effect under acidic conditions, but under alkaline conditions a hydrolytic time of 14 h gave the maximum conversion rate. The chelation experiment results showed that the ratios (2:1, 2.5:1, and 3:1) showed almost equal chelation rates, except the 1:1 ratio of hydrolysis product to salt. Iron (Fe), copper (C...
45 citations
TL;DR: An amorphous cobalt sulfide was synthesized by precipitation from aqueous solutions of cobalt nitrate and sodium sulfide, and its chemical composition, CoS 0.92 · 0.9H 2 O, was determined from energy dispersive X-ray analysis and thermogravimetric data.
Abstract: An amorphous cobalt sulfide was synthesized by precipitation from aqueous solutions of cobalt nitrate and sodium sulfide, and its chemical composition, CoS 0.92 ·0.9H 2 O, determined from energy dispersive X-ray analysis and thermogravimetric data. X-ray photoelectron spectroscopy measurements confirmed the valence state of Co to be Co 2+ bound to s 2- and O in H 2 O molecules. This amorphous sulfide reacts reversibly with lithium in lithium cells in several steps, which exhibited some coincidence with those observed for crystalline CoS 0.89 , as revealed by step potential curves. However, the cycling properties are rather different. Thus, the capacity of the cell made from the crystalline compound fades rapidly with cycling; by contrast, the amorphous compound exhibits better capacity retention upon cycling, with capacity values almost four times greater than those for cells made from CoS 0.89 . Supplementary experimental results are consistent with the improved performance being a result of the role played by the water content rather than the amorphous structure of the compound.
38 citations
TL;DR: In this article, a new simple route for preparing nanocrystals of cadmium and zinc sulfides and their respective core/shell nanostructures in aqueous solution has been developed by precipitation from metal chloride solutions with sodium sulfide in the presence of polyethyleneimine (PEI) hyperbranched polymer.
37 citations
TL;DR: In this paper, photoluminescent cellulose fibres were prepared by coating bleached Kraft fibres (Pinus radiata) with ZnS nanocrystals doped with Mn2+ and Cu2+ ions.
36 citations
TL;DR: In this article, a sonochemical solution of cadmium sulfide (nano-CdS) was successfully prepared from an aqueous solution of Cadmium chloride and sodium sulfide by adding polyvinylpyrrolidone K30 (PVP) as the dispersant.
Abstract: Nanoparticles of cadmium sulfide (nano-CdS) have been successfully prepared from an aqueous solution of cadmium chloride and sodium sulfide by a novel sonochemical method. Through adding polyvinylpyrrolidone K30 (PVP) as the dispersant, a yellow translucent colloidal solution of cadmium sulfide which was considerably stable within at least one month was obtained. The characterizations of nanoparticles by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscope (SEM) and FT-IR spectroscopy showed good properties of small size, high surface area and crystal structure. The size of the prepared nanoparticles was about 3–5 nm according to XRD spectra and TEM images. Poly(diallyldimethylammonium chloride) (PDDA) has been employed to fabricate multilayer films on quartz wafer and indium tin oxide (ITO) electrode in a layer-by-layer manner. Atomic force microscopy (AFM) displayed the dense coverage of the substrate surface by the nanoparticles. UV–vis absorption spectroscopy confirmed the consecutive growth of PDDA/nanoparticles layer pairs. The photoelectrochemical and the electrochemical behaviors of the prepared CdS particle were examined as well.
32 citations
TL;DR: In this paper, the formation of cadmium sulfide (CdS), a semiconductor used for optoelectronic devices, in the interlayer space of montmorillonite by solid-solid reactions between Cd(II)-montmorillonites and sodium sulfide at room temperature was investigated.
TL;DR: In this article, the synthesis of symmetrical and unsymmetrical cyclic disulfides based on the reaction of sulfur with sodium sulfide in the presence of Didecyldimethylammonium bromide (DDAB) as a phase transfer catalyst is described.
TL;DR: A series of butyl end-capped dehydrothieno[14]annulenes (DTAs) has been prepared and further transformed into electron-rich terthiophenes (3TPs) by reaction with sodium sulfide.
TL;DR: In this paper, the formation of sulfide ions to the interlayer manganese cations was indicated by Raman, UV-visible, and photoluminescence spectra.
TL;DR: In this article, a new route to 2H-thiochromenes using the tandem SN2′ and SNAr reaction of several Baylis-Hillman acetates having an ortho-substituent, such as a halogen or nitro group, with sodium sulfide in aqueous dimethyl sulfoxide has been described.
Patent•
06 Aug 2008
TL;DR: In this paper, a method for comprehensively utilizing serendipities, which comprises: magnetically separating the serpentinites in a strong magnetic field, obtaining amorphous silica powder which contains silicon dioxide more than 90% through filtering acid dipping solution, dissolving the powder through using caustic soda under high temperature, and fractionally depositing, filtering, and removing impurity for magnesium sulfate solution which is filtered through the acid dipping and contains the impurity, through adjusting the pH value, obtaining inorganic industrial dyes which mainly contain iron oxide yellow,
Abstract: The invention relates to a method for comprehensively utilizing serendipities, which comprises: magnetically separating the serpentinites in a strong magnetic field, obtaining amorphous silica powder which contains silicon dioxide more than 90% through filtering acid dipping solution, dissolving the amorphous silica powder through using caustic soda under high temperature, which is used for manufacturing soluble glass with medium high modulus or taken as raw materials for producing white carbon black, then, mixing sulphuric acid and hydrochloric acid or nitric acid or mixing the sulphuric acid, the hydrochloric acid and nitric acid, adding acid dipping additive to carry out compound alternative and circulating acid dipping for ore powder which is magnetically separated and processed, fractionally depositing, filtering, and removing impurity for magnesium sulfate solution which is filtered through the acid dipping and contains the impurity, through adjusting the pH value, obtaining inorganic industrial dyes which mainly contain iron oxide yellow, ferric hydroxide and aluminum hydroxide, enriching the nickel, which is convenient for abstracting the nickel from the serpentinites, finally obtaining high purity magnesium oxide through refining refined magnesium sulfate solution whose impurity is removed after ammonium hydrogen carbonate and ammonial solution or sodium sulfide is used to deposit, and also obtaining ammonium sulfate or sodium sulfate which contains magnesium and calcium after liquid which is filtered is evaporated.
TL;DR: In this article, an easy preparation of substituted 3-amino-2-nitrothiophenes and selenophenes was described, where substituted β-chloroacrylonitriles were reacted with sodium sulfide or sodium selenide and bromonitromethane.
Patent•
03 Sep 2008
TL;DR: A deposition-hydrothermal method for producing a nano-sized CdxZn S photocatalyst with high visible-light photocatalytic activity is described in this paper.
Abstract: The invention discloses a deposition-hydrothermal method for producing a nano-sized CdxZn S photocatalyst with high visible-light photocatalytic activity The method includes the following steps: 1) adding dropwise a mixed solution of cadmium nitrate and zinc nitrate into a sodium sulfide solution, stirring at a medium rate for 05-3 hours, maintaining the temperature at 10-40 DEG C to obtain a nano-sized powdery precursor precipitate; 2) placing the nano-sized powdery precursor precipitate in a reaction vessel, raising the temperate at a rate of 1-5 DEG C/min up to 150-240 DEG C, maintaining the temperature, allowing hydrothermal reactions for 12-24 hours, stopping the hydrothermal reactions, naturally cooling down to room temperature, taking out the reaction products, washing with the deionized water and the anhydrous alcohol for 3-4 times, drying at 50-80 DEG C in a vacuum drying oven to obtain a solid solution of nano-sized CdxZn S photocatalyst The production method is carried out in water phase with easy operation and low cost The product has uniform distribution of particle size, the forbidden band width and optical properties thereof are controlled by changing components, and the product has high visible-light photocatalytic activity and good prospects in industrial application
Patent•
05 Mar 2008
TL;DR: In this article, the high iron slimed wulfenite floating process adopts sodium hexametaphosphate as dispersant, sodium hydroxide as ore pulp pH regulator, sodium sulfide for sulfurizing and deleading, copper sulfate as activator, kerosene as water repellent, isoamyl xanthate as collector and 2# oil as foaming agent.
Abstract: The high iron slimed wulfenite floating process adopts sodium hexametaphosphate as dispersant, sodium hydroxide as ore pulp pH regulator, sodium sulfide for sulfurizing and deleading, copper sulfate as activator, kerosene as water repellent, isoamyl xanthate as wulfenite collector and 2# oil as foaming agent. The process can float to recover wulfenite with high iron content and serious sliming effectively. When the raw ore has Mo content of 0.5-0.76 %, Mo concentrate obtained through once coarse separation and four times of fine separation has Mo content of13-16.8 % and recovery rate up to 71-76 %.
Patent•
28 May 2008
TL;DR: In this paper, a sodium hydrosulfide preparation method utilizing hydrogen sulfide exhaust was proposed, which not only resolved the treatment problems of the three wastes of barium carbonate and strontium carbonates enterprises, but also can reuse calcium sulfate, the byproduct from the preparation of sodium sulfide, as raw materials for other chemical production, which realizes the recycling of raw materials and products.
Abstract: A purpose of the invention is to provide a sodium hydrosulfide preparation method utilizing hydrogen sulfide exhaust. The invention not only can resolve the treatment problems of the three wastes of barium carbonate and strontium carbonate enterprises, but also can reuse calcium sulfate, the byproduct from the preparation of sodium hydrosulfide, as raw materials for other chemical production, which realizes the recycling of raw materials and products. The production ability of the traditional alkali solution absorbing method, the absorbing adaptability of mixed hydrogen sulfide exhaust and the sodium hydrosulfide preparation rate are enhanced; while the production cost is reduced and the exhaust can be discharged according to standards after being absorbed by alkali solution. The invention resolves the problems of low absorption rate of hydrogen sulfide gas, low production efficiency of preparation of sodium hydrosulfide, large investment of technical devices and difficulty of solid phase recycling existing in a method of 'one step for preparation of sodium hydrosulfide' using hydrogen sulfide gas, calcium hydroxide and sodium sulfide as raw materials.
Patent•
09 Jul 2008
TL;DR: In this article, a method for boiling high concentration pulping in normal pressure or low pressure by an alkaline method with zero residual alkaline was proposed, and the method comprises adding accelerating agent in the boiling process and utilizing a double screw to rub and squeeze a pulper.
Abstract: The invention relates to a method for boiling high concentration pulping in normal pressure or low pressure by an alkaline method with zero residual alkaline, and the method comprises adding accelerating agent in the boiling process and utilizing a double screw to rub and squeeze a pulper, leading pulp making and boiling process with an alkaline method to go on in normal pressure or low pressure, and leaving no residual alkaline in black liquor, leading pulp to always keep a higher density in the pulping process of boiling, washing and bleaching, and the pulp which is prepared can meets the requirement of paper making. Accelerating agent chooses one or a plurality of magnesium hydrate, potassium hydrate, sodium metasilicate, sodium sulfide, sodium sulfite, ammonium sulfite and carbamide. Special-purpose pulping boiling equipment and high-pressure boilers are not needed by pulping paper mills through utilizing the invention, in the process of pulping, pulp always keeps higher density, and black liquid has high density, little numbers and low energy consumption, alkaline recovery project with great investment is not needed to be built, and the invention enables black liquid to prepare fertilizer or other chemical products with high quality, and the invention is suitable for popularizing and applying.
Patent•
23 Apr 2008
TL;DR: In this paper, a preparation method for albendazole is described, which comprises condensation reaction, reduction reaction, and ring-closing reaction, using polyethylene glycol as phase transfer catalyst and 0-methyl isourea formic ether as ring closing agent.
Abstract: The present invention relates to a preparation method of albendazole The preparation method comprises condensation reaction, reduction reaction and ring-closing reaction In the condensation reaction, polyethylene glycol is used as phase transfer catalyst; pure sodium hydroxide solution is used to replace sodium cyanide solution or sodium sulfide solution; the clathrate separation method with zinc chloride is adopted to directly separate a condensation substance, 2-nitro-4-propyl aniline zinc chloride complex, from the mixture of the reaction; then alkali is used for destroying the complex and dissolving the zinc chloride to prepare pure 2-nitro-4-propyl aniline; in the reduction reaction, hydrazine hydrate is used for reduction; in the ring-closing reaction, 0-methyl isourea formic ether is used as ring-closing agent The preparation method has the advantages of high yield of the product, low production cost, clean process, high purity of the product and suitability for industrialization
TL;DR: A desulfurization strain that belongs to the thermophilic alkaline desulphuricant is designated as strain GDJ-3 and isolated from Inner Mongolia, China as discussed by the authors.
Abstract: A desulfurization strain that belongs to the thermophilic alkaline desulphuricant is designated as strain GDJ-3 and isolated from Inner Mongolia, China. The colony of the strain shows tiny, yellow, or white-yellow, and it becomes henna with the protracting of cultivated time. The cells are bacilliform (0.3−0.6 × 1.0−1.2 μm), motive, and Gram negative. The strain GDJ-3 is able to utilize respectively the thiosulphate, sulfate, sulfite, or sulfide as sulfur source, utilize the carbon dioxide as the carbon source, and utilize the ammonium or nitrate as the nitrogen source. According to GenBank data, 16s RNA results of GDJ-3 are in good agreement with Alpha proteobacterrium sp. (97%) and Ochrobactrum sp. (98%). For GDJ-3, the optimum growth temperature is at 45°C, the optimum pH is at 8.5–8.8, and the optimum rocking speed of sorting table is at 150 r/min. Under the optimum culture condition, the cells of the strain can live for about 18 h. In the desulfurization solution, which is prepared according to the composition of DDS solution, the objectionable constituents of sodium thiosulphate and sodium sulfide were added factitiously, and the bacterial cell concentration was set at 107/mL. After the regeneration of the above desulfurization solution by the strain cells, the concentration of sodium thiosulphate was decreased by 14.75 g/L (percentage loss of content 13.21%), the concentration of sodium sulfide was decreased by 0.76 g/L (percentage loss of content 87.36%) in the desulfurization solution in 9.5 hours, and sulfur appeared. Maybe, this kind of strain can be used as the regeneration’s bacterial source of DDS solution.
Patent•
02 Jan 2008
TL;DR: In this article, a production technology of N, N-dicyclo hexylcar bodiimide is described, which comprises the following steps: generating dicycloenyl sulfourea and sodium sulfide with cyclohexylamine and carbon bisulphide; generating N, n-dicyclehexylcar body-bivimide by oxygenizing dicyCLohexyl sulfoupourea twice with sodium hypochlorite and removing hydrogen sulfide.
Abstract: The invention discloses a production technology of N, N'-dicyclo hexylcar bodiimide, which comprises the following steps: generating dicyclohexyl sulfourea and sodium sulfide with cyclohexylamine and carbon bisulphide; generating N, N'-dicyclo hexylcar bodiimide by oxygenizing dicyclohexyl sulfourea twice with sodium hypochlorite and removing hydrogen sulfide. The invention is characterized by the following: adding the accelerant when dicyclohexyl sulfourea is oxygenized by sodium hypochlorite; applying triethyl benzyl ammonium chloride(TEBA)or carbowax as the accelerant; adding sodium sulfide which is generated in the first step reaction in order to removing sulfur by reacting with sulfur in the organic phase after oxygenizing twice. The invention guarantees the sufficient oxidation reaction, which reduces the production cost, and improves the product quality.
Patent•
27 Aug 2008
TL;DR: The inventive organic compound contains mineral-philic group -SH, hydrophilic group -COOH, -OH, -SO3, etc. in molecular structure, which fully shows the inhibiting property against pyrrhotite, pyrite and chalcopyrite in complex sulfide ore flotation separation, and is a high selectivity desulphurizing inhibitor as discussed by the authors.
Abstract: The invention discloses a specific inhibitor application in complex sulfide ore. The inventive organic compound contains mineral-philic group -SH, hydrophilic group -COOH, -OH, -SO3, etc. in molecular structure, which fully shows the inhibiting property against pyrrhotite, pyrite and chalcopyrite in complex sulfide ore flotation separation, and is a high selectivity desulphurizing inhibitor. Compared with the prior inorganic inhibitors such as cyanide, lime, zinc sulfate, trisodium phosphate, dichromate, potassium permanganate, sodium sulfide, sulfite, etc., the inventive inhibitor has the advantages of low usage amount, good index and no pollution.
Patent•
18 Jun 2008
TL;DR: In this paper, a zero-emission treatment process of O-phenylenediamine sodium sulfide reduction wastewater was proposed, which adopts the following steps in sequence: wastewater is filtered, O-PNs in the wastewater are absorbed and extracted by resin; the remained wastewater is vaporized and extracted to remove sodium chlorine; the wastewater that sodium chlorine is removed is filtered and crystallized to extract the sodium thiosulfate; the remaining wastewater is concentrated to obtain sodium sulfite mixture.
Abstract: The invention relates to a zero-emission treatment process of O-phenylenediamine sodium sulfide reduction wastewater, which adopts the following steps in sequence: wastewater is filtered; O-phenylenediamine in the wastewater is absorbed and extracted by resin; the remained wastewater is vaporized and extracted to remove sodium chlorine; the wastewater that sodium chlorine is removed is filtered and crystallized to extract the sodium thiosulfate; the remained wastewater is concentrated to obtain sodium sulfite mixture. The invention can treat O-phenylenediamine sodium sulfide reduction wastewater with zero emission, so as to solve environmental pollution of wastewater thoroughly, thereby having obvious environmental benefit; simultaneously the wastewater is treated by the means of resource utilization, organic chemical product- O-phenylenediamine and inorganic product- sodium thiosulfate and sodium thiosulfate mixture are extracted from the wastewater; full process is a cleaning treatment process, not only secondary pollution is not generated but also energy is utilized circularly during process; the invention has small investment, simple process and practicality, and is applicable for popularization and utilization in the industry.
Patent•
20 Aug 2008
TL;DR: In this paper, a separation method of koechlinite mineral, which adopts BK510 reagent as inhibitor, is presented, wherein, the BK 510 reagent comprises a component of sodium thioglycolate; BK 505 reagent, econolite and coal oil are added to the koe chlinite bulk concentrate and stirred; roughing of one time, choiceness of three times and scavenging of two times are processed and the molybdenum concentrate with moly bdenum above 45% and bism
Abstract: The invention discloses a separation method of koechlinite mineral, which adopts BK510 reagent as inhibitor; wherein, the BK510 reagent comprises a component of sodium thioglycolate; BK510 reagent, econolite and coal oil are added to the koechlinite bulk concentrate and stirred; roughing of one time, choiceness of three times and scavenging of two times are processed and the molybdenum concentrate with molybdenum above 45% and bismuth below 0.70% is acquired; the BK510 reagent has the advantages of resolving the problems of large amount of sodium sulfide, abominable operating environment and serious pollution, convenient addition and safe use. The separation method of koechlinite mineral has the advantages of low amount of inhibitor, reducing pollution, and improving the production condition.
Patent•
20 Feb 2008
TL;DR: In this paper, a method to precipitate amorphous zinc sulfide thin film under the ambient temperature is described, which is characterized in that the method integrates an ultrasonic irradiation technology and continuous absorption and reaction method of ion layer, the process of the thin film deposition comprises a plurality of cycles, each cycle comprises four steps: absorption of the anion precursor solution, reaction and absorption of cation precursor solution.
Abstract: The utility model relates to a method to precipitate amorphous zinc sulfide thin film under the ambient temperature, which is characterized in that the method integrates an ultrasonic irradiation technology and continuous absorption and reaction method of ion layer, the process of the thin film deposition comprises a plurality of cycles, each cycle comprises four steps: (1) absorption of the anion precursor solution; (2) ultrasonic irradiation on the substrate; (3) reaction and absorption of the cation precursor solution; (4) ultrasonic irradiation on the substrate The anion precursor is prepared by mixture of the inorganic salt of the zinc or the organic acetate with the complexing agent, the complexing agent can be ethylenediamine or ammonia water; the cation precursor is made of the inorganic sulfide, such as sodium sulfide; the substrate is made of either the ordinary glass, or the quartz glass, or the ITO conductive glass, or the monocrystalline silicon, or the sapphire The utility model has advantages that the ZnS film layer is made of the compact ZnS nanometer particles, the size of the particle is 10 to 30 nm; the heating or expensive vacuum equipment is not required due to simple processing method adopted and low cost The method is applicable to the mass production
TL;DR: In this article, Toluene and water were used as separate solvents for zinc stearate and sodium sulfide, respectively, and oleic acid was used as a stabilizing ligand for the nanocrystals.
Patent•
19 Mar 2008
TL;DR: An oxygen sulfur symbiosis zinc mine flotation method uses sodium hexametaphosphate as a dispersant, sodium sulfide as an activator, octadecyl acetic acid amine and kerosene as collectors and No.2 oil as foaming agent as mentioned in this paper.
Abstract: An oxygen sulfur symbiosis zinc mine flotation method uses sodium hexametaphosphate as a dispersant, sodium sulfide as an activator, octadecyl acetic acid amine and kerosene as collectors and No.2 oil as foaming agent. During the flotation, ores are grinded into mineral monomers for dissociation. Then, the sodium hexametaphosphate is added in a stirring barrel firstly, the sodium sulfide is added for activation and octadecyl acetic acid amine, the kerosene and the No.2 oil are added for collection. With the present invention adopted, the flotation and the recovery of oxide zinc and sulfide zinc can be realized at the same time. The process is shortened. The equipment investment is saved and the production cost is lowered. The total recovery rate of the zinc can reach to 85-90 percentage, and the zinc concentrate grade can reach to 39-52 percentage.