Topic
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.
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TL;DR: Symmetric disulfides are produced by treating their corresponding organic halides including benzylic, allylic, primary and secondary halides with Na2S·3H2O and C2Cl6 or CCl4 in PEG-200 at room temperature in high yields.
Abstract: Symmetric disulfides are produced by treating their corresponding organic halides including benzylic, allylic, primary and secondary halides with Na2S·3H2O and C2Cl6 or CCl4 in PEG-200 at room temperature in high yields
9 citations
TL;DR: In this paper, it was shown that the direct homogeneous photolysis of HS− may contribute significantly to the heterogeneous zinc sulfide-catalyzed hydrogen evolution in the presence of sodium sulfide when performed in quartz vessels.
Abstract: UV irradiation (λ ⩾ 248 nm) of sodium sulfide in aqueous solution leads to hydrogen and disulfide, Φ(H2) = 0.34 at λ = 254 nm. Light absorption occurs by HS− which affords the solvated electron and the HS radical as indicated by flash photolysis and pulse radiolysis. In the presence of formate, hydrogen evolution becomes catalytic with respect to HS−, Φ(H2) = 0.12 at λ = 254 nm. Deuteration experiments indicate that hydrogen formation occurs partially via hydrogen atoms which abstract hydrogen from formate. The latter is finally oxidized to give carbonate. When methanol is used instead of formate, there are produced ethanol, ethylene glycol, methane, and formaldehyde in addition to hydrogen and carbonate. It is shown that the direct homogeneous photolysis of HS− may contribute significantly to the heterogeneous zinc sulfide-catalyzed hydrogen evolution in the presence of sodium sulfide when performed in quartz vessels.
Katalytische und stochiometrische Bildung von Wasserstoff bei der UV-Bestrahlung von Natrium- und Zinksulfid
UV-Belichtung (λ ⩾ 248 nm) von Natriumsulfid in wasriger Losung fuhrt zu Wasserstoff und Disulfid, Φ(H2) = 0.34 bei λ = 254 nm. Die Lichtabsorption erfolgt durch HS−, dessen Primarreaktion zum HS-Radikal und solvatisierten Elektron durch Blitzlichtspektroskopie und Pulsradiolyse untersucht wurde. In Gegenwart von Natriumformiat wird die Wasserstoffentwicklung katalytisch in bezug auf HS−, Φ(H2) = 0.12 bei λ = 254 nm. Deuterierungsexperimente deuten darauf hin, das die Wasserstoffbildung teilweise uber eine Abstraktionsreaktion zwischen Wasserstoffatomen und Formiatmolekulen erfolgt. Letztere werden schlieslich zu Carbonat oxidiert. Wird Methanol statt Formiat verwendet, werden zusatzlich zu Wasserstoff und Carbonat noch Ethanol, Ethylenglycol, Methan und Formaldehyd gebildet. Die direkte, homogene Photolyse von HS− tragt betrachtlich zur heterogenen, Zinksulfid-katalysierten Wasserstoffentwicklung bei, wenn letztere in Quarzapparaturen in Gegenwart von Natriumsulfid durchgefuhrt wird.
9 citations
TL;DR: In this article, a normal coordinate vibrational analysis has been performed based on a non-linear four-atom model having SS bond lengths = 2.04 A, S ǫ s bond angles = 105°, and the Sǫ S dihedral angle = 90°.
9 citations
TL;DR: In this article, a bifunctional resin with thiol and quaternary ammonium groups was prepared from a macroporous strongly basic anion exchange resin of the styrene-divinylbenzene type.
Abstract: A bifunctional resin with thiol and quaternary ammonium groups was prepared from a macroporous strongly basic anion exchange resin of the styrene-divinylbenzene type. The key step of the synthesis is the reaction of the quaternary benzyltrimethylammonium group of the ion exchange resin with suitable sulfur-containing nucleophiles. Three synthetic routes are described: direct conversion to thiol with sodium sulfide, reaction with potassium O-ethyl dithiocarbonate followed by decomposition of the dithiocarbonate with ammonia or acid and conversion to polymeric isothiuronium salt by the reaction with thiourea and subsequent alkaline hydrolysis to thiol. Sorption of arsenate on thiol resin and its Fe(III) complex was studied.
9 citations
TL;DR: In this paper, the effect of different S2− sources on the synthesis and degrading properties of the composite was evaluated through the photocatalytic degradation of methylene blue in aqueous solution.
Abstract: To synthesize ZnS/RGO nanocomposite via one-step solvothermal method with graphene oxide (GO) aqueous solution as precursor, we selected sodium sulfide and thiourea as S2− donor, respectively, with the aim to evaluate the effect of different S2− sources on the synthesis and degrading properties of the composite. The photocatalytic activity of the nanocomposite was investigated through the photocatalytic degradation of methylene blue in aqueous solution. Results showed that ZnS/RGO nanocomposites were synthesized using both sodium sulfide and thiourea as S2− donor, respectively. Compared to pure ZnS, the nanocomposites exhibited higher photocatalytic activity; furthermore, the nanocomposite prepared with sodium sulfide as the S2− source exhibited much better photocatalytic degradation efficiency than that with thiourea as the S2− source. The surface reaction rate constant of the former was two times higher than that of the latter and was six times higher than that of pure ZnS sample.
9 citations