Sodium sulfide

About: Sodium sulfide is a research topic. Over the lifetime, 2851 publications have been published within this topic receiving 27733 citations. The topic is also known as: disodium sulfide.

Efficient synthesis of substituted tetrahydrothiopyrano [2,3 -b]thiopyran -4,5-diones by a double annulation strategy from dialkenoylketene dithioacetals

Abstract: An efficient synthetic procedure for substituted 2,3,6,7tetrahydrothiopyrano [2,3-b] thiopyran-4,5 -diones by a double annulation strategy is described. The ring systems are made in good yields from readily available dialkenoylketene dithioacetals in the presence of either sodium sulfide nonahydrate/N,N-dimethylformamide (DMF) or a sodium hydride/DMF/amine system.

Process for removal of mercury from hydroxyl-ammonium nitrate solutions

Abstract: A process for the removal of mercury from industrial waste streams is disclosed wherein the waste stream is a nitrate based solution that has been decomposed by the addition of hypochlorite. The method involves adding a reducing agent to reduce the hypochlorite and/or adjusting the pH by the use of a strong acid to less than about 2.0, converting any residual chlorine to a soluble unreactive salt, adding a soluble precipitating agent, such as sodium sulfide, to the solution in a ratio to the mercury present of greater than 1:1 to about 2:1 to precipitate out the mercury as a mercury compound. The solution is then filtered to remove the precipitated mercury compound.

Synthesis, optical and structural characterization of cds nanoparticles

Abstract: Cadmium sulfide nanoparticles were grown using wet chemical method by dissolving the reactants of cadmium acetate and sodium sulfide in the presence of thioglycerol (TG) as capping agent in ethanol solvent. Different nanoparticle sizes and size distribution were obtained through varying the molarities of thioglycerol. At higher TG concentration, synthesis provides a nearly monodisperse nanoparticles. Also this method reveals high stability of nanoparticles in ethanol solvent. Samples properties were investigated using UV-VIS absorption, photoluminescence spectroscopy and X-ray diffraction (XRD) methods.

Chemical Pretreatment of Silver Wire Containing Copper for Preparation of Silver/Silver Sulfide Ion Selective Electrode

Abstract: The silver/silver sulfide ion selective electrode (ISE) has been produced in a variety of forms. While the membrane type reportedly exhibits superior performance characteristics in comparison to the type derived from solid silver, the latter offers decided advantages in terms of cost and convenience. We wish to report that a microscale silver/silver sulfide ISE can be readily prepared from silver wire (0, 7 mm diameter) which contains 2, 5-6% Cu (w/w) by exposing the wire to a deaerated aqueous solution of sodium sulfide, ascorbic acid, and etbylenediaminetetraacetic acid (SAOB-H) for 2 days. Although this procedure is similar to one reported in the manufacturers' literature, it is significant that a successful ISE could not be prepared by this technique if pure silver (99.99%) was used or if the SAOB-II solution was not deaerated. Finally, the performance of electrodes obtained in this manner was basically indistinguishable from that of a commercially available electrode of the membrane type.

Process for producing faujasitic-type crystalline zeolites

Abstract: Faujasitic-type crystalline zeolites X and Y are produced. In one embodiment, sodium sulfide is added to the reaction mixture as a source of sodium and as a buffer. The buffering action of the sodium sulfide provides the basicity required to maintain the alumina hydrate component of the reaction mixture in solution but not a basicity whereby zeolite crystallization is retarded. In another embodiment, a nucleating mixture having the formula 3-10 Na2 S: 5-15 Na2 O: 5-50 SiO2 : 0.4-4.0 Al2 O3 : 50-500 H2 O is added to the reaction mixture to promote crystalline zeolite formation.