Showing papers on "Sodium sulfide published in 2010"
TL;DR: In this paper, the S L- and Au L 3 -edge X-ray absorption fine structure and Xray photoelectron spectra of nanoscale Au-S products formed via the reduction of aqueous HAuCl 4 by sulfide ions and immobilized onto graphite have been acquired.
78 citations
TL;DR: In this paper, mixed southern hardwood chips were extracted with an alkaline wood pulping solution called kraft green liquor, which contained mainly sodium carbonate and sodium sulfide.
Abstract: Mixed southern hardwood chips were extracted with an alkaline wood pulping solution called kraft green liquor. This aqueous solution containing mainly sodium carbonate and sodium sulfide was applie...
65 citations
TL;DR: Evaluation of the photocatalytic activity for H(2) evolution of these mixed crystals from an aqueous solution containing S(2-) and SO(3)(2-) ions upon loading Ru catalysts under simulated solar radiation revealed that active compounds for this reaction should contain both dissolved ZnS and Ag components.
Abstract: A series of mixed crystals composed of Cu2ZnSnS4, Ag2ZnSnS4 and ZnS was prepared by co-precipitation of the corresponding metal ions in aqueous sodium sulfide followed by annealing in a sulfur atmosphere. Ideal solid solutions of Cu2ZnSnS4 and Ag2ZnSnS4 with a kesterite structure ((CuxAg1−x)2ZnSnS4 (0 ≤ x ≤ 1)) were successfully obtained by this procedure, as confirmed by their X-ray diffraction (XRD) patterns and energy-diffuse X-ray (EDX) analyses. On the other hand, the solubility of ZnS in these kesterite compounds was found to be limited: the upper limit of the ratio of ZnS to (CuxAg1−x)2ZnSnS4 was less than 0.1, regardless of the Cu–Ag ratio in (CuxAg1−x)2ZnSnS4. Based on the results for dependence of their photoabsorption properties on atomic compositions, a plausible band structure is discussed. Evaluation of the photocatalytic activity for H2 evolution of these mixed crystals from an aqueous solution containing S2− and SO32− ions upon loading Ru catalysts under simulated solar radiation (AM 1.5) revealed that active compounds for this reaction should contain both dissolved ZnS and Ag components. The dissolved ZnS in (CuxAg1−x)2ZnSnS4 gave upward shifts of their conduction band edges. Moreover, the presence of Ag in the solid solution provided n-type conductivity, leading to efficient migration of photogenerated electrons to the surface to induce water reduction into H2.
57 citations
TL;DR: In this paper, the main purpose of extracting indium from the Irankoh zinc plant residue was to extract indium, and the optimum conditions for leaching of indium and reduction of ferric ion in reductive leaching were obtained at temperature of 90 °C for a leaching duration of 3 h with sulfuric acid concentration of 100 g/L.
51 citations
TL;DR: In this article, the interaction between di(1-alkynyl) sulfides (1) and sodium sulfide, selenide or telluride in mixtures of liquid ammonia and methanol or dimethylformamide, gave 1,4-dithiins (2), 1, 4-thiaselenins (3) and 1 4 -thiatellurins (4).
Abstract: Interaction between di(1-alkynyl) sulfides (1) and sodium sulfide, selenide or telluride in mixtures of liquid ammonia and methanol or dimethylformamide and methanol gives 1,4-dithiins (2), 1,4-thiaselenins (3) and 1,4-thiatellurins (4).
44 citations
TL;DR: Na2S did not improve resuscitability but significantly compromised postresuscitation hemodynamics, and high-dose Na2S significantly decreased microglial activation in striatal areas, although this did not translate into improved neurological outcome.
Abstract: Treatment options to improve resuscitability and neurological prognosis after cardiac arrest (CA) are limited. Hydrogen sulfide has demonstrated remarkable improvements in outcomes in small animal models of severe hypoxia or hemorrhage. We investigated the influence of sodium sulfide (Na2S),
40 citations
TL;DR: The data showed that the BAS-reactor with Thiobacillus thioparus TK-1 can be used for sulfide removal from industrial effluent.
40 citations
TL;DR: In this article, the transformation of ferrihydrite to siderite in the presence of supercritical CO 2 (scCO 2 ) and aqueous sulfide has been investigated by in situ attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) and ex situ X-ray diffraction (XRD).
35 citations
TL;DR: The feasibility of using sodium sulfide as the sole modifier for the flotation of Xinhua molybdenite ore was examined in this paper, where the potential mechanisms involved in different flotation systems were discussed.
33 citations
TL;DR: An ultrasound assisted solution-phase process has been applied for the aqueous synthesis of zinc sulfide nanocrystals in the presence of 3-mercaptopropionic acid (3-MPA) as a capping agent.
Abstract: An ultrasound-assisted solution-phase process has been applied for the aqueous synthesis of zinc sulfide nanocrystals in the presence of 3-mercaptopropionic acid (3-MPA) as a capping agent. The synthesis procedure was carried out by using two reagents: zinc chloride and sodium sulfide. Spherical shaped nanoparticles were agglomerated in the form of nanoclusters were observed. Obtained crystalline materials were found without the need of a post-synthesis treatment. The preparative conditions such as precursor concentrations, pH, and washing materials were optimized. The average crystalline size of ZnS nanostructures has been analyzed by X-ray diffraction (XRD) pattern and estimated to be 4.7 nm. The energy dispersive X-ray analysis (EDAX) reveals the average atomic percentage of Zn/S was 50:50, showing that the preparation is exactly stoichiometric. Optical measurements indicate a direct band gap of about 4.27 eV. There was observed a blue shift of about 0.57 eV, in comparison to its bulk value due to quantum confinement effects of electrons and holes.
24 citations
TL;DR: In this paper, 1-alkynyl trimethylsilylethynyl sulfides (1-Alkynyl Eysynyl SDSs) are easily accessible starting from 1-ALKYNyl EYSDSs.
Abstract: 1-Alkynyl ethynyl sulfides RC≡CS-C≡CH (2) are easily accessible starting from 1-alkynyl trimethylsilylethynyl sulfides RC≡CS-C≡CSi(CH3)3 (1).
When compounds 2 are treated with sodium sulfide, selenide or telluride in methanol 1,4-dithiins, 1,4-thiaselenins and 1,4-thiatellurins are obtained in good yields.
TL;DR: None of the polyelectrolytes examined here provide long-term protection of the nanoparticles toward oxidation by air, showing that a need for more complex multipurpose stabilizers exists for aqueous PbS dispersions.
Abstract: Lead sulfide (PbS) nanoparticles have been synthesized in aqueous solutions by a reaction between inorganic lead salts and sodium sulfide and stabilized using the cationic polyelectrolytes branched poly(ethylenimine) (PEI), poly(allylamine hydrochloride) (PAH), and poly(diallyldimethylammonium chloride) (PDDA). The structures of the polyamine-stabilized nanoparticle dispersions were examined in detail using UV-vis spectroscopy, small-angle X-ray scattering (SAXS), static and dynamic electrophoretic mobility measurements, and transmission electron microscopy (TEM). Considerable differences were found between the stabilizing efficiencies of these polyelectrolytes, which cannot be attributed to their charge densities or their persistence lengths. Small monodisperse nanoparticles of PbS with a tight stabilizing shell were consistently found only when PEI was used as a stabilizer even at high pH values, although its charge density is then very low. The excellence of PEI as a stabilizer is mainly due to the extensive branching of the chains and the presence of uncharged secondary and tertiary amine groups, which apparently serve as good anchoring points at the nanoparticle surfaces. None of the polyelectrolytes examined here provide long-term protection of the nanoparticles toward oxidation by air, showing that a need for more complex multipurpose stabilizers exists for aqueous PbS dispersions.
TL;DR: In this article, the authors developed a model that explained sulfide loss in bottle studies (batch reactors) and continuously gas-purged (continuous) reactors, and found that cell growth was slightly affected by the sulfide concentration.
TL;DR: In this article, the chemical modification of polyvinyl chloride (PVC) by nucleophilic substitution was considered for upgrading waste PVC, which resulted in the formation of a mixture comprising 32% elimination and 26% substitution products.
Abstract: The recycling of poly(vinyl chloride) (PVC) is one of the most important issues in the treatment of waste plastics. To improve PVC recycling, it is necessary to develop new recycling techniques, including new techniques for the dechlorination of chlorine-containing polymers. It has been established that wet dechlorination of PVC in NaOH/ethylene glycol solution is more effective than dry dechlorination. In this study, the wet process was used, and the chemical modification of PVC by nucleophilic substitution was considered for upgrading waste PVC. Chlorine was substituted in solution by several nucleophilic reagents, thus changing the properties of PVC. The reaction of PVC in Na2S/ethylene glycol solution at 170°C resulted in the formation of a mixture comprising 32% elimination and 26% substitution products. The scanning electron microscopy/energy dispersive X-ray spectroscopy mappings and elementary analysis of PVC indicated that this chlorine-substitution process led to cross-linking by sulfur.
TL;DR: High selectivity sodium sulfide is effectively stabilizing the leaching copper ion with high selectivity in the presence of microwave irradiation and finally stabilized in the form of copper sulfide, which is a significant reaction to stabilize the copper ion leaching in the waste sludge.
Patent•
28 Jul 2010
TL;DR: In this paper, a method for recovering arsenic sulfide from arsenic-containing waste residue, which comprises of the following steps: taking arsenic residue with the arsenic content of 7.1-16.8, stirring and mixing with water, evenly mixing, and gradually adding alkali at the temperature of room temperature-60 DEG C for carrying out leaching treatment, wherein the alkali content is calculated by 2.0-3.5g/g.
Abstract: The invention discloses a method for recovering arsenic sulfide from arsenic-containing waste residue, which comprises the following steps: taking arsenic sulfide residue with the arsenic content of 7.1-16.8%, stirring and mixing with water, wherein the water content is calculated by 100-150mL/100g residue; evenly mixing, and gradually adding alkali at the temperature of room temperature-60 DEG C for carrying out leaching treatment, wherein the alkali content is calculated by 2.0-3.5g/g arsenic sulfide; further continuously maintaining the leaching process for 40-120 min after completing the addition of the alkali, and filtering; using water which is calculated by 50mL/100g arsenic sulfide residue for washing the residue step by step, merging filtrate and washing solution, using sulfuric acid with the concentration of 93-98% for neutralization, controlling the pH to be 9-11, filtering, further using the sulfuric acid with the concentration of 93-98% for neutralization till the pH is 1-3.5, adding sodium sulfide for leading the pH to be 2-4, then filtering, carrying out 2-3 times of repulping washing and filtering washing on sediment, obtaining secondary sediment, and drying for obtaining an arsenic sulfide finished product. The method can reduce the reaction temperature, shorten the leaching time and improve the recovery rate of arsenic.
TL;DR: In this article, three series of metal-containing silicalites-1 (M = Zn, Ni, Co or Fe) were synthesized using different procedures, and the catalytic properties were tested in propane conversion process.
Patent•
07 Apr 2010
TL;DR: In this article, a method for treating a cadmium-containing waste liquid from a process of recovering a silver-indium-cadmium alloy, wherein the treating process comprises the following steps of: (1) adjusting pH of the waste liquid in order to adjust the recovery ratio to 4 to 7, (2) adding sodium carbonate to perform first-stage precipitation separation, (3) adding Sodium sulfide to a supernate obtained by the precipitation separation to perform second-stage precipitation, and (4) adding polyferric sulfate to
Abstract: The invention relates to a method for treating a cadmium-containing waste liquid from a process of recovering a silver-indium-cadmium alloy, wherein the treating process comprises the following steps of: (1) adjusting pH of the cadmium-containing waste liquid in the process of recovering the silver-indium-cadmium alloy to 4 to 7; (2) adding sodium carbonate to perform first-stage precipitation separation; (3) adding sodium sulfide to a supernate obtained by the precipitation separation to perform second-stage precipitation; (4) adding polyferric sulfate to perform co-precipitation; (5) adding polyacrylamide to perform flocculation precipitation and precipitation separation and (6) adding hydrogen peroxide to a separation liquid so as to remove sulfur ions introduced by sodium sulfide. Tests show that both the concentrations of a cadmium-containing ion and a sulfur-containing ion in the treated waste liquid are lower than the national specified highest allowable discharge concentration, and that the entire process is operated at normal temperature with low energy consumption.
TL;DR: In this article, the solubility of sodium sulfide in methanol, ethanol, 2-propanol, 2 -methyl-1-poly(1) poly(1)-propanols and benzyl alcohol has been determined at (20 and 35) °C.
Abstract: The solubility of sodium sulfide in methanol, ethanol, 2-propanol, 2-methyl-1-propanol, and benzyl alcohol and the acid−base interaction of these compounds have been determined at (20 and 35) °C. The reactions result in the formation of sodium alkoxide and hydrosulfide. The reported values on the solubility of sodium sulfide in alcohols differ essentially from the data described in the literature.
TL;DR: In this article, a new synthetic method for nolatrexed dihydrochloride (thymitaq) has been developed, which is accomplished in three steps featuring the direct conversion of the starting 4-bromo-5-methylisatin into the methyl anthranilate by potassium peroxydisulfate/sodium methoxide.
TL;DR: In this paper, the production of MoO3 from Sarcheshmeh molybdenite concentrate via a pyro-hydrometallurgical process was studied, and the effect of the mass ratio of carbonate to sulfide on the reaction products and the solubility of the products was investigated.
Abstract: The production of MoO3 from Sarcheshmeh molybdenite concentrate via a pyro-hydrometallurgical process was studied. The molybdenite concentrate and sodium carbonate were premixed and fused under air atmosphere. Then the fused products were leached in water and the dissolved molybdenum was recovered as ammonium molybdate. The ammonium molybdate was then calcined to produce molybdic oxide. At the fusion stage, the effect of the mass ratio of carbonate to sulfide on the reaction products and the solubility of the products was investigated. The results show that during the fusion, sodium molybdate and sodium sulfate are the final reaction products and sodium sulfide is detected as an intermediate reaction product. By melting at 850°C with 5wt% excess carbonate, the maximum solubility of the products is obtained. The molybdenum is recovered from the solutions as ammonium molybdate.
TL;DR: In this paper, a mixture of methanol and dimethyl sulfoxide was used to remove contaminating 3,4-epithio-1-butene and 3,6-dihydro-1,2-dithiin.
Abstract: 2,5-Dihydrothiophene can be obtained in reasonable yield by reaction of cis-1,4-dichloro-2-butene with anhydrous sodium sulfide in a mixture of methanol and dimethyl sulfoxide. The contaminating 3,4-epithio-1-butene can be removed by reaction with excess of Na2S. 3,4-Epithio-1-butene and 3,6-dihydro-1,2-dithiin have been obtained in good yields by treating trans-1,4-dibromo-2-butene and cis-1,2-dichloro-2-butene with Na2S and Na2S2, respectively.
TL;DR: Arylacetylenes react with sodium sulfide in the presence of water to yield divinylsulfides, which represent useful substrates for further transformations, for example, oxidation to the corresponding divinyl sulfoxides and divinyl sulfones as discussed by the authors.
Abstract: Arylacetylenes react with sodium sulfide in the presence of water to yield divinylsulfides. The reaction proceeds in good to excellent yield for both electron-neutral and electron-deficient aromatic systems; for electron-rich aryls, longer reaction times are necessary. The sulfides represent useful substrates for further transformations, for example, oxidation to the corresponding divinylsulfoxides and divinylsulfones. Three selected divinylsulfide derivatives were oxidized selectively to the corresponding sulfoxides or sulfones.
TL;DR: Pyrimidine and purine nucleoside analogues with a 1,4-dioxane, 1, 4-oxathiane, or 1 4oxazine ring structure have been prepared from the corresponding dimesylated seconucleosides by treatment with either sodium hydroxide, sodium sulfide or primary alkylamines as mentioned in this paper.
Abstract: Pyrimidine and purine nucleoside analogues with a 1,4-dioxane, 1,4-oxathiane or 1,4-oxazine ring structure have been prepared from the corresponding dimesylated seconucleosides by treatment with either sodium hydroxide, sodium sulfide or primary alkylamines.
TL;DR: In this article, the electrochemical reactions of a copper electrode in Na 2 S solutions were studied using cyclic voltammetry, potentiostatic and galvanostatic measurements, in addition surface examination and morphological studies were applied using scanning electron microscopy (SEM), energy dispersive analysis of X-rays (EDAX).
Patent•
24 Feb 2010
TL;DR: In this paper, a hydrothermal method for synthesizing spindle or rod-like silver sulfide nanometer particles and a preparation method thereof is described. But the method and the technological process are simple, a reaction is carried out in a water phase, products are easy to separate and clean and are environment-friendly.
Abstract: The invention relates to spindle or rodlike silver sulfide nanometer particles and a preparation method thereof. The lengths of spindle nanometer silver sulfide particles are all 70-120 nm; the lengths of rodlike silver sulfide nanometer particles are 100-340 nm, and the length-diameter ratio is 2-4. A hydrothermal method for synthesizing the silver sulfide nanometer particles comprises the following steps: dissolving PVP to water; respectively adding an ammonia solution of silver nitrate and an aqueous solution of sodium sulfide to the aqueous solution of PVP; uniformly stirring and transferring the aqueous solution to a hydro-thermal synthesis kettle with an inner liner of polyfluortetraethylene; and heating the hydro-thermal synthesis kettle at a temperature of 100-180 DEG C to obtain spindle or rodlike silver sulfide nanometer particles. The invention has the advantages that: (1) the method and the technological process are simple, a reaction is carried out in a water phase, products are easy to separate and clean and are environment-friendly; (2) a protective agent PVP has good water solubility and low cost without toxicity and harmlessness and is easy to obtain and beneficialto industrialized production; (3) a hydro-thermal synthesis system is adopted to prepare the spindle or rodlike silver sulfide nanometer particles; and (4) the obtained spindle or rodlike silver sulfide nanometer particles have good dispersivity, uniform shape and high stability.
Patent•
29 Dec 2010
TL;DR: In this article, a method for the treatment of wastewater containing heavy metal molybdenum sulfide is proposed. But the method is not suitable for reuse and cannot be used for recycling.
Abstract: The invention belongs to the technical field of water treatment, in particular to a method for treatment of wastewater containing heavy metal molybdenum. The specific steps are as follows: placing the wastewater which needs to be treated and contains the heavy metal molybdenum into a sealing device; adding sodium sulfide into the device, controlling the pH value of the wastewater after adding the sodium sulfide at 2-3, carrying out reaction for 1-3h at room temperature, and continuously adding the generated sodium sulfide into the molybdenum-containing wastewater for recycling; adding a flocculant into the obtained solution, stirring, carrying out the reaction, standing till precipitate is settled, then discharging supernatant fluid, and passing through a filter device, wherein the precipitate of molybdenum sulfide can be recycled after collection treatment; and adding a mixed coagulant till the pH value of the obtained acid solution is neutral, stirring for removing redundant sulfide ions, standing for 2-5 min till the precipitate is settled, and then discharging the supernatant fluid for ensuring water quality of outlet water. The method for the treatment of the wastewater containing the heavy metal molybdenum has the prominent advantages of good treatment effect, simple treatment equipment, low treatment cost, recycling and utilization of the metal molybdenum and the like.
01 Jan 2010
TL;DR: In this article, the dissolution kinetics of tetrahedrite in aqueous alkaline sodium sulfide solutions was investigated and the effect of mineral particle size, reaction temperature, and mineral particle density on the dissolution rate was investigated.
Abstract: The dissolution kinetics of tetrahedrite in aqueous alkaline sodium sulfide solutions was investigated in this present study The effect of mineral particle size, reaction temperature, sodium sulfi
Patent•
15 Sep 2010
TL;DR: In this paper, a device for treating alkaline residue generated by desulfurizing light oil, which comprises a light oil inputting pipe, a carbon dioxide jar, a mixer, a fibrous membrane contactor, a sedimentation jar, an alkaline liquor circulating pipe, and a waste liquid outputting pipe is described.
Abstract: The utility model discloses a device for treating alkaline residue generated by desulfurizing light oil, which comprises a light oil inputting pipe, a carbon dioxide jar, a mixer, a fibrous membrane contactor, a sedimentation jar, an alkaline liquor circulating pipe, an alkaline liquor inputting pipe, a dilution water inputting pipe and a waste liquid outputting pipe, wherein the alkaline liquor inputting pipe is connected with an alkaline liquor oxidizing tower, the alkaline liquor oxidizing tower is internally provided with a gas distributor and a heating device, the lower part of the alkaline liquor oxidizing tower is provided with an air inputting pipe, the upper part thereof is provided with the alkaline liquor inputting pipe, and the top part thereof is provided with an exhaust pipe. The alkaline residue is used for oxidizing sodium mercaptide and sodium sulfide into sodium hydroxide and the like in the alkaline liquor oxidizing tower, and the sodium hydroxide is carbonized to be sodium bicarbonate in the fibrous membrane contactor to be separated from the oil and dissolved in waste liquid, therefore, the device is an environment-friendly device for treating the alkaline residue generated by desulfurizing the light oil, leads the treated waste liquid to meet the discharging requirement into a biological pond for the further treatment, and can improve the quality of the extracted light oil.
TL;DR: In this article, the corrosion behavior of Fe3Al was investigated in simulating biofilm environment by open circle potential, polarization curves, and electrochemical impedance in simulated seawater.
Abstract: Calcium Alginate is a kind of natural biopolymer which can be deposited on metal surfaces to form film. In this work, microbe film was simulated by Calcium Alginate gel, according to the natural structure and property of microbe film. Acetic acid, manganese dioxide, and sodium sulfide were added separately in sodium chloride solution to simulate different bacteria culture systems. The corrosion behavior of Fe3Al was investigated in simulating biofilm environment by open circle potential, polarization curves, and electrochemical impedance. Electrochemical results show that the passivating film formed immediately when Fe3Al electrodes exposed in simulated seawater. The corrosion process of Fe3Al in the medium with manganic sediment was mainly dominated by oxygen diffusion. In the simulated environment with acetic acid, the pitting corrosion potential on the surface of Fe3Al moved towards negative accompanied with the increasing concentration of chlorine ion and the decreasing value of pH. Simulated sulphate...